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Iskander Tlili
Physics Department, College of Science, Al-Zulfi, Majmaah University, Al-Majmaah, 11952, Saudi Arabia

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Short communication
Published: 04 June 2021 in Case Studies in Thermal Engineering
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The main purpose of this investigation is to analyze the flow and heat transfer behavior of a non Newtonian fluid (Oldroyd B fluid) with hybrid nanostructure subject to externally inclined magnetic field. Cattaneo Christov heat flux model is incorporated in the energy equation. Non linear thermal radiation and viscous dissipation mechanisms are considered. Shooting technique is implemented to accomplish the numerical solution. The outcomes of the numerical computations are discussed with the aid of relevant graphs. The performed study reveals that rise in magnetic field strength shows opposite behavior to fluid velocity and temperature. Thermal relaxation time factor controls the rate of heat transportation. Rise in curvature parameter accelerates the fluid flow while that of angle of inclination of magnetic field imparts the reverse effect.

ACS Style

M.K. Nayak; V.S. Pandey; S. Shaw; O.D. Makinde; K.M. Ramadan; Mouna Ben Henda; Iskander Tlili. Thermo-fluidic significance of non Newtonian fluid with hybrid nanostructures. Case Studies in Thermal Engineering 2021, 26, 101092 .

AMA Style

M.K. Nayak, V.S. Pandey, S. Shaw, O.D. Makinde, K.M. Ramadan, Mouna Ben Henda, Iskander Tlili. Thermo-fluidic significance of non Newtonian fluid with hybrid nanostructures. Case Studies in Thermal Engineering. 2021; 26 ():101092.

Chicago/Turabian Style

M.K. Nayak; V.S. Pandey; S. Shaw; O.D. Makinde; K.M. Ramadan; Mouna Ben Henda; Iskander Tlili. 2021. "Thermo-fluidic significance of non Newtonian fluid with hybrid nanostructures." Case Studies in Thermal Engineering 26, no. : 101092.

Short communication
Published: 15 May 2021 in Case Studies in Thermal Engineering
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In recent years, the nanofluids are assumed to be most effective source of energy and reflect many applications in various industrial and engineering processes. With effective thermal properties, the nano-materials convey exclusive beneficial applications in heat exchanges, coolant processes, medical treatment, electronic cooling systems, energy production etc. The prime objective of current analysis is to scrutinize the three-dimensional double stratification flow of Burgers fluid containing microorganisms. The thermal radiation with nonlinear relations and heat absorption and generation applications are also endorsed. The modified forms of heat and mass diffusions are utilized to modify the analysis. The flow expressions for modeled problem are numerically evaluated by employing the shooting scheme. Physical features for various parameters against velocity of fluid, temperature distribution, volumetric concentration of nanoparticles and rescaled density of nanoparticles is deliberated with the help of several graphs. The observations reveal that heat and mass transfer mechanism decline with Deborah number. The concentration field rise up with concentration stratified Biot number while reduces with concentration relaxation constant. The presence of buoyancy parameters enhanced nanofluid temperature, concentration and microorganisms profiles. The obtained theoretical observation reveal applications in industrial, engineering and thermal processes which heat transfer involved. The claimed results are useful to improve the cooling and heating processes, energy generation, thermal devices, solar systems, manufacturing processes etc.

ACS Style

Sami Ullah Khan; Rana Alabdan; Abdel-Rahman Al-Qawasmi; Ali Vakkar; Mouna Ben Handa; Iskander Tlili. Bioconvection applications for double stratification 3-D flow of Burgers nanofluid over a bidirectional stretched surface: Enhancing energy system performance. Case Studies in Thermal Engineering 2021, 26, 101073 .

AMA Style

Sami Ullah Khan, Rana Alabdan, Abdel-Rahman Al-Qawasmi, Ali Vakkar, Mouna Ben Handa, Iskander Tlili. Bioconvection applications for double stratification 3-D flow of Burgers nanofluid over a bidirectional stretched surface: Enhancing energy system performance. Case Studies in Thermal Engineering. 2021; 26 ():101073.

Chicago/Turabian Style

Sami Ullah Khan; Rana Alabdan; Abdel-Rahman Al-Qawasmi; Ali Vakkar; Mouna Ben Handa; Iskander Tlili. 2021. "Bioconvection applications for double stratification 3-D flow of Burgers nanofluid over a bidirectional stretched surface: Enhancing energy system performance." Case Studies in Thermal Engineering 26, no. : 101073.

Short communication
Published: 05 May 2021 in Case Studies in Thermal Engineering
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This research presents the bioconvection flow of third grade nanofluid confined by a stretched cylinder in presence of thermal radiation, heat absorption/generation phenomenon, activation energy and exponential space-based heat source. The famous Buongiorno nanofluid is used applications to access the Brownian motion and thermophoresis effects. The problem is formulated in terms of partial differential equations by using the fundamental laws. The dimensionless form of problem is obtained equations by using suitable transformation. Later on, the numerical outcomes for the couple of discretized system are obtained by employing the powerful numerical shooting algorithm. Since this investigation is based on some theoretical flow assumptions, therefore each physical parameter specified some constant range like 0.1≤β1≤1.2,0.4≤β2≤1.2,0.1≤β3≤1.2, 0.2≤Re≤0.8, 0.1≤λ≤1.4, 0.1≤M≤1.2, 0.1≤Nr≤1.2, 0.1≤Nc≤1.3, 0.0≤Rd≤0.8, 2.0≤Pr≤5.0, 0.1≤Nb≤0.25, 0.1≤Nt≤0.4,1.5≤θw≤1.8, 1.2≤Le≤2.4, 0.1≤E≤0.4, 1.2≤Lb≤2.4, 0.1≤Pe≤1.2, 0.1≤δ1≤0.6, 0.1≤λ1≤0.4,. 0.1≤λ2≤0.4, 0.2≤λ3≤0.5. The physical significance of prominent parameters versus subjective flow profiles are graphically underlined with physical justifications. It is observed that presence of exponential space-based heat source and heat source parameter is more useful to improve the nanofluid temperature. An increment in nanofluid concentration is observed with solutal Biot number and activation energy parameter. Moreover, the microorganisms profile decline with bioconvection Lewis number while reverse trend is observed for microorganism stratification Biot number.

ACS Style

Mouna Ben Henda; Hassan Waqas; Mohib Hussain; Sami Ullah Khan; Wathek Chammam; Shan Ali Khan; Iskander Tlili. Applications of activation energy along with thermal and exponential space-based heat source in bioconvection assessment of magnetized third grade nanofluid over stretched cylinder/sheet. Case Studies in Thermal Engineering 2021, 26, 101043 .

AMA Style

Mouna Ben Henda, Hassan Waqas, Mohib Hussain, Sami Ullah Khan, Wathek Chammam, Shan Ali Khan, Iskander Tlili. Applications of activation energy along with thermal and exponential space-based heat source in bioconvection assessment of magnetized third grade nanofluid over stretched cylinder/sheet. Case Studies in Thermal Engineering. 2021; 26 ():101043.

Chicago/Turabian Style

Mouna Ben Henda; Hassan Waqas; Mohib Hussain; Sami Ullah Khan; Wathek Chammam; Shan Ali Khan; Iskander Tlili. 2021. "Applications of activation energy along with thermal and exponential space-based heat source in bioconvection assessment of magnetized third grade nanofluid over stretched cylinder/sheet." Case Studies in Thermal Engineering 26, no. : 101043.

Research papers
Published: 01 April 2021 in Journal of Thermal Science and Engineering Applications
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Thermal creep effects on fluid flow and heat transfer in a microchannel gas flow at low velocities are studied numerically. The continuity and Navier–Stokes equations in vorticity–stream function form, coupled with the energy equation, are solved, considering the thermal creep effect due to the longitudinal temperature gradient along the channel wall in addition to the combined effects of viscous dissipation, pressure work, axial conduction, shear work, and nonequilibrium conditions at the gas–wall interface. The governing equations are also solved without thermal creep, and comparisons between the two solutions are presented to evaluate the thermal creep effect on the flow field in the slip flow regime at relatively low Reynolds numbers. The results presented show that the thermal creep effect on both velocity and temperature fields become more significant as the Reynolds number decreases. Thermal creep effect on the velocity field also extends a longer distance downstream the channel as the Reynolds number decreases, hence increasing the hydrodynamics entrance length. Thermal creep can cause high positive velocity gradients at the upper channel wall for gas heating and hence reverse the flow rotation in the fluid layers adjacent to the wall. Thermal creep also results in a higher gas temperature in the developing region and higher heat exchange between the fluid and the channel wall in the entrance region. Thermal creep effect on heat exchange between the gas and the channel wall becomes more significant as the Knudsen number decreases.

ACS Style

Khalid M. Ramadan; Mohammed Kamil; Iskander Tlili; Omar Qisieh. Analysis of Thermal Creep Effects on Fluid Flow and Heat Transfer in a Microchannel Gas Heating. Journal of Thermal Science and Engineering Applications 2021, 13, 1 -18.

AMA Style

Khalid M. Ramadan, Mohammed Kamil, Iskander Tlili, Omar Qisieh. Analysis of Thermal Creep Effects on Fluid Flow and Heat Transfer in a Microchannel Gas Heating. Journal of Thermal Science and Engineering Applications. 2021; 13 (6):1-18.

Chicago/Turabian Style

Khalid M. Ramadan; Mohammed Kamil; Iskander Tlili; Omar Qisieh. 2021. "Analysis of Thermal Creep Effects on Fluid Flow and Heat Transfer in a Microchannel Gas Heating." Journal of Thermal Science and Engineering Applications 13, no. 6: 1-18.

Original research
Published: 12 February 2021 in Mathematical Sciences
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A mathematical model is realistic to assess a comparative study of nanofluid and hybrid nanofluid flow between two eccentric pipes. Study of nanofluid has been developed recurrently over the earlier era. By taking the nanofluid study in higher level, the researchers tried to use hybrid nanofluid, which was modeled by placing different nanoparticles either in composite or mixture form. The method of using hybrid nanofluid is to get more thermal conductivity of base fluid. For this phenomena, we consider Ni and \(\gamma Al_2O_3\) as nanoparticles and \(C_2H_6O_2\) as a base fluid. The inner pipe is rigged and rotating with velocity (V), whereas the external pipe is sinusoidal (wave moving down to its boundaries) like the contracting and relaxation phenomena. Low Reynolds number and long wavelength approximation are used for analytic solution. The resulting nonlinear PDEs are converted into ODEs by using perturbation technique. After this, we compare graphically the behavior of friction forces on inner and outer pipes, pressure gradient, pressure rise, velocity and temperature profiles for multi-values of solid volume fractions.

ACS Style

Iskander Tlili. Impact of thermal conductivity on the thermophysical properties and rheological behavior of nanofluid and hybrid nanofluid. Mathematical Sciences 2021, 1 -9.

AMA Style

Iskander Tlili. Impact of thermal conductivity on the thermophysical properties and rheological behavior of nanofluid and hybrid nanofluid. Mathematical Sciences. 2021; ():1-9.

Chicago/Turabian Style

Iskander Tlili. 2021. "Impact of thermal conductivity on the thermophysical properties and rheological behavior of nanofluid and hybrid nanofluid." Mathematical Sciences , no. : 1-9.

Journal article
Published: 10 February 2021 in Alexandria Engineering Journal
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In this report, the hydromagnetic dissipative Newtonian/non-Newtonian fluid flow over a stretched surface is examined numerically. Brownian moment, Joule heating, thermophoresis effects are considered. Similarity variables are employed to transform the non-linear PDEs into ODEs. The eminent shooting scheme is employed to determine the solution of the nonlinear equations. Solutions are achieved for different benefits of parameters of the model and the consequences are predicted in plots and tables. The Brownian moment imposed to accelerate the energy field and the dissipation influences to expand both the thermal and momentum fields. Also, simultaneous solutions are exhibited and found that the heat transport in Casson fluids has superior properties than the regular fluid.

ACS Style

Iskander Tlili; S.P. Samrat; N. Sandeep. A computational frame work on magnetohydrodynamic dissipative flow over a stretched region with cross diffusion: Simultaneous solutions. Alexandria Engineering Journal 2021, 60, 3143 -3152.

AMA Style

Iskander Tlili, S.P. Samrat, N. Sandeep. A computational frame work on magnetohydrodynamic dissipative flow over a stretched region with cross diffusion: Simultaneous solutions. Alexandria Engineering Journal. 2021; 60 (3):3143-3152.

Chicago/Turabian Style

Iskander Tlili; S.P. Samrat; N. Sandeep. 2021. "A computational frame work on magnetohydrodynamic dissipative flow over a stretched region with cross diffusion: Simultaneous solutions." Alexandria Engineering Journal 60, no. 3: 3143-3152.

Journal article
Published: 08 February 2021 in Scientific Reports
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On the account of significance of bioconvection in biotechnology and several biological systems, valuable contributions have been performed by scientists in current decade. In current framework, a theoretical bioconvection model is constituted to examine the analyzed the thermally developed magnetized couple stress nanoparticles flow by involving narrative flow characteristics namely activation energy, chemical reaction and radiation features. The accelerated flow is organized on the periodically porous stretched configuration. The heat performances are evaluated via famous Buongiorno’s model which successfully reflects the important features of thermophoretic and Brownian motion. The composed fluid model is based on the governing equations of momentum, energy, nanoparticles concentration and motile microorganisms. The dimensionless problem has been solved analytically via homotopic procedure where the convergence of results is carefully examined. The interesting graphical description for the distribution of velocity, heat transfer of nanoparticles, concentration pattern and gyrotactic microorganism significance are presented with relevant physical significance. The variation in wall shear stress is also graphically underlined which shows an interesting periodic oscillation near the flow domain. The numerical interpretation for examining the heat mass and motile density transfer rate is presented in tubular form.

ACS Style

Sami Ullah Khan; Kamel Al-Khaled; A. Aldabesh; Muhammad Awais; Iskander Tlili. Bioconvection flow in accelerated couple stress nanoparticles with activation energy: bio-fuel applications. Scientific Reports 2021, 11, 1 -15.

AMA Style

Sami Ullah Khan, Kamel Al-Khaled, A. Aldabesh, Muhammad Awais, Iskander Tlili. Bioconvection flow in accelerated couple stress nanoparticles with activation energy: bio-fuel applications. Scientific Reports. 2021; 11 (1):1-15.

Chicago/Turabian Style

Sami Ullah Khan; Kamel Al-Khaled; A. Aldabesh; Muhammad Awais; Iskander Tlili. 2021. "Bioconvection flow in accelerated couple stress nanoparticles with activation energy: bio-fuel applications." Scientific Reports 11, no. 1: 1-15.

Journal article
Published: 05 February 2021 in Sustainable Energy Technologies and Assessments
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Solar energy can be harnessed by direct conversion of solar energy to electrical energy by using photovoltaic (PV) technology or with the help of thermodynamic cycle by using concentrated solar power (CSP) technologies. The goal of this paper is to perform detailed comparative analysis for the two solar technologies namely: PV and dish Stirling engine (DSE). In order to ensure a fair comparison, the two systems are designed for the same rated capacity of 1 MW for Tabuk, Saudi Arabia. The average values of direct normal irradiance (DNI) and global horizontal irradiance (GHI) in Tabuk are 7.43 kWh/m2/day and 6.31 kWh/m2/day, respectively. The two technologies are analyzed based on several performance indicator factors such as capacity factor (CF), solar to electric efficiency, energy output, levelized electricity cost (LEC), and net present value (NPV). The comparative analysis of the two technologies shows that PV system has 6.9% better CF and 54% more energy output compared to DSE system. The LEC of PV systems is 3.39 ¢/kWh which is much better than the 11.74 ¢/kWh from the DSE system. The NPV of the PV system is positive while DSE system has negative NPV. This paper present useful insight of the two technologies which is helpful to choose a solar power technology for a power project.

ACS Style

Ahmed Bilal Awan; Muhammad Zubair; Zulfiqar Ali Memon; Nabil Ghalleb; Iskander Tlili. Comparative analysis of dish Stirling engine and photovoltaic technologies: Energy and economic perspective. Sustainable Energy Technologies and Assessments 2021, 44, 101028 .

AMA Style

Ahmed Bilal Awan, Muhammad Zubair, Zulfiqar Ali Memon, Nabil Ghalleb, Iskander Tlili. Comparative analysis of dish Stirling engine and photovoltaic technologies: Energy and economic perspective. Sustainable Energy Technologies and Assessments. 2021; 44 ():101028.

Chicago/Turabian Style

Ahmed Bilal Awan; Muhammad Zubair; Zulfiqar Ali Memon; Nabil Ghalleb; Iskander Tlili. 2021. "Comparative analysis of dish Stirling engine and photovoltaic technologies: Energy and economic perspective." Sustainable Energy Technologies and Assessments 44, no. : 101028.

Research article
Published: 07 January 2021 in Numerical Methods for Partial Differential Equations
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The non‐Newtonian fluids have become quite prevalent in industry and engineering for different applications. When these fluids flow over industrial equipment, a boundary layer phenomenon is developed due surface friction of equipment. In this work, a boundary layer phenomenon for two famous non‐Newtonian fluids namely pseudoplastic and dilatant over moving belt is discussed. The physical problem is modeled through continuity, momentum and energy equations under boundary layer assumptions. In these equations, power law models for viscosity and thermal conductivity properties are used due to the non‐linear nature of fluids. The governing equations are reduced to ordinary differential equations via similarity variables and get the analytical solution by using Mathematica package BVPh 2. The assessment of boundary layer against dimensionless velocity and temperature distribution are calculated and displaced by graphically when the belt is moving in the same and opposite direction to flow and displayed graphically. In addition, momentum and thermal boundary layers thicknesses, the thickness momentum distribution and moving fluid surface are calculated numerically to understand the boundary layer structure and the deflation in mass flow rate and in the momentum flux. A progress trend for thermal as well as momentum boundary layers has been noticed and found the maximum discrepancy in mass flow rate in case of dilatant fluid. The thickness of boundary layer region is thicker for dilatants material due to higher viscosity.

ACS Style

Mohsan Hassan; Kamel Al‐Khaled; Sami Ullah Khan; Iskander Tlili; Wathek Chammam. Assessment of boundary layer for flow of non‐Newtonian material induced by a moving belt with power law viscosity and thermal conductivity models. Numerical Methods for Partial Differential Equations 2021, 1 .

AMA Style

Mohsan Hassan, Kamel Al‐Khaled, Sami Ullah Khan, Iskander Tlili, Wathek Chammam. Assessment of boundary layer for flow of non‐Newtonian material induced by a moving belt with power law viscosity and thermal conductivity models. Numerical Methods for Partial Differential Equations. 2021; ():1.

Chicago/Turabian Style

Mohsan Hassan; Kamel Al‐Khaled; Sami Ullah Khan; Iskander Tlili; Wathek Chammam. 2021. "Assessment of boundary layer for flow of non‐Newtonian material induced by a moving belt with power law viscosity and thermal conductivity models." Numerical Methods for Partial Differential Equations , no. : 1.

Short communication
Published: 31 December 2020 in Case Studies in Thermal Engineering
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The present article concentrates on the heat and mass transfer characteristics of a mixed convective flow of an electrically conducting nanofluid past a slender Riga plate in the presence of viscous dissipation and chemical reaction. The heat and mass transfer characteristics are analyzed by a zero nanoparticle mass flux and convective boundary conditions. The thermophoretic and Brownian aspects for nanoliquid are proposed using Buongiorno's relations. The similarity quantities are utilized to obtain dimensionless forms of flow field equations. The resulting coupled nonlinear equations associated with the constituted boundary assumptions analytically proceed via optimal homotopy analysis method (OHAM). Various parameters causing the change in distributions of velocity, temperature, and concentration are graphically explained with relevant physical references. One of the important observations of the present study is, for higher values of modified Hartmann number the velocity profile increases and temperature profile supreses and it is interesting to note that the contemporary numerical simulations offer confirmable accuracy in the existing literature, which authenticates the novelty of current investigation.

ACS Style

Hanumesh Vaidya; K.V. Prasad; I. Tlili; O.D. Makinde; C. Rajashekhar; Sami Ullah Khan; Rakesh Kumar; D.L. Mahendra. Mixed convective nanofluid flow over a non linearly stretched Riga plate. Case Studies in Thermal Engineering 2020, 24, 100828 .

AMA Style

Hanumesh Vaidya, K.V. Prasad, I. Tlili, O.D. Makinde, C. Rajashekhar, Sami Ullah Khan, Rakesh Kumar, D.L. Mahendra. Mixed convective nanofluid flow over a non linearly stretched Riga plate. Case Studies in Thermal Engineering. 2020; 24 ():100828.

Chicago/Turabian Style

Hanumesh Vaidya; K.V. Prasad; I. Tlili; O.D. Makinde; C. Rajashekhar; Sami Ullah Khan; Rakesh Kumar; D.L. Mahendra. 2020. "Mixed convective nanofluid flow over a non linearly stretched Riga plate." Case Studies in Thermal Engineering 24, no. : 100828.

Short communication
Published: 29 December 2020 in Case Studies in Thermal Engineering
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In present investigation, the axisymmetric analysis for the Casson nano-material has been analyzed due to two parallel stretchable disks. The novel thermophoresis and Brownian aspects of nanofluid are studied by using Buongiorno nanofluid model. Similarity transformations are applied on the system of governing equations that renovate it into the problem into proper dimensionless form. The homotopic procedure is suggested for the determination of solution. The role of numerous parameters on dimensionless velocity and temperature are observed in very effective way. To study the effect of Brownian motion and thermophoresis diffusion parameter, Buongiorno model is adopted. Radial and axial velocity profile has increasing behavior for stretching ratio and Casson parameter. As the value of Biot number and thermophoresis parameter enhanced, the concentration profile also enhances and concentration profile declines due to increase in value of Brownian motion parameter. Temperature profile decreases as the value of Reynolds number and Prandtl number increased. The values of Sherwood number, Nusselt number and Skin friction are calculated at upper and lower disk to understand the behavior of stretching disks.

ACS Style

A. Aldabesh; Mazmul Hussain; Nargis Khan; Anis Riahi; Sami Ullah Khan; Iskander Tlili. Thermal variable conductivity features in Buongiorno nanofluid model between parallel stretching disks: Improving energy system efficiency. Case Studies in Thermal Engineering 2020, 23, 100820 .

AMA Style

A. Aldabesh, Mazmul Hussain, Nargis Khan, Anis Riahi, Sami Ullah Khan, Iskander Tlili. Thermal variable conductivity features in Buongiorno nanofluid model between parallel stretching disks: Improving energy system efficiency. Case Studies in Thermal Engineering. 2020; 23 ():100820.

Chicago/Turabian Style

A. Aldabesh; Mazmul Hussain; Nargis Khan; Anis Riahi; Sami Ullah Khan; Iskander Tlili. 2020. "Thermal variable conductivity features in Buongiorno nanofluid model between parallel stretching disks: Improving energy system efficiency." Case Studies in Thermal Engineering 23, no. : 100820.

Original article
Published: 04 December 2020 in Applied Nanoscience
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Carbon nanotubes (CNTs) are inevitable due to its tremendously high thermal and electrical conductivities, strength, stiffness, and toughness characteristics. The utilization of both porous media and nanofluids with CNTs as nanoparticles can augment the thermal efficiency of typical physical systems significantly. In view of such advantages, the present study is intended to convey the influence of entropy minimization and nonlinear thermal radiation on the electromagnetic flow of nanofluids with single wall carbon nanotubes (SWCNTs) and multiwall carbon nanotubes (MWCNTs) nanoparticles suspensions past the surface of thin needle. In addition, the famous Darcy Forchheimer flow and Cattaneo-Christov heat flux models are implemented. The required numerical solution is devised pragmatically via bvp4c in MATLAB for the system of highly nonlinear ordinary differential equations. It is found that the porous matrix and local Forchheimer parameter are detrimental to the regular flow of nanofluids. Thermal fields magnify in respect of hiked porosity and temperature ratio parameters and diminish due to rise in electric and thermal relaxation parameters. Entropy minimization due to porous irreversibility is prominent for MWCNTs than SWCNTs. Bejan number upsurges due to rise in volume fraction and porosity parameter for both SWCNT-water and MWCNT-water nanofluids.

ACS Style

M. K. Nayak; F. Mabood; Iskander Tlili; A. S. Dogonchi; W. A. Khan. Entropy optimization analysis on nonlinear thermal radiative electromagnetic Darcy–Forchheimer flow of SWCNT/MWCNT nanomaterials. Applied Nanoscience 2020, 11, 399 -418.

AMA Style

M. K. Nayak, F. Mabood, Iskander Tlili, A. S. Dogonchi, W. A. Khan. Entropy optimization analysis on nonlinear thermal radiative electromagnetic Darcy–Forchheimer flow of SWCNT/MWCNT nanomaterials. Applied Nanoscience. 2020; 11 (2):399-418.

Chicago/Turabian Style

M. K. Nayak; F. Mabood; Iskander Tlili; A. S. Dogonchi; W. A. Khan. 2020. "Entropy optimization analysis on nonlinear thermal radiative electromagnetic Darcy–Forchheimer flow of SWCNT/MWCNT nanomaterials." Applied Nanoscience 11, no. 2: 399-418.

Journal article
Published: 17 November 2020 in International Communications in Heat and Mass Transfer
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The current analysis is performed to find the dual nature solutions of MHD (magnetohydrodynamic) water-based carbon nanotubes (CNTs) over a shrinking sheet. This phenomenon contains other important effects such as: laminar, incompressible, porous media, thermal radiation and viscous dissipation. The sheet is shrinking along x-axis and fluid is dealing for the boundary domain. The governing partial differential equations are transformed to nonlinear system of ordinary differential equation by using appropriate similarity transformations. This mathematical model is solved and obtained the closed form dual nature solutions in special hyper geometric function. Results of velocity, temperature, skin friction and Nusselt number are plotted against variation of different emerging parameters.

ACS Style

Rizwan Ul Haq; T. Sajjad; M.Z. Ullah; A.S. Alshomrani; Iskander Tlili. Dual nature solutions of water-based carbon nanotubes along a shrinking surface in the presence of thermal radiation and viscous dissipation. International Communications in Heat and Mass Transfer 2020, 119, 104938 .

AMA Style

Rizwan Ul Haq, T. Sajjad, M.Z. Ullah, A.S. Alshomrani, Iskander Tlili. Dual nature solutions of water-based carbon nanotubes along a shrinking surface in the presence of thermal radiation and viscous dissipation. International Communications in Heat and Mass Transfer. 2020; 119 ():104938.

Chicago/Turabian Style

Rizwan Ul Haq; T. Sajjad; M.Z. Ullah; A.S. Alshomrani; Iskander Tlili. 2020. "Dual nature solutions of water-based carbon nanotubes along a shrinking surface in the presence of thermal radiation and viscous dissipation." International Communications in Heat and Mass Transfer 119, no. : 104938.

Journal article
Published: 07 November 2020 in Results in Physics
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This communication provides an innovative idea of entropy generation optimization and activation energy aspects on transient axisymmetric flow of Williamson nanofluid due to moving radiallysurface with the effects of binary chemical reactions. A revised model of nanofluid is adopted for the suspension of nanoparticles. Moreover, nonlinear thermal radiation is considered. Impact of Joule heating, MHD and viscous dissipation enhances the importance of this investigation for entropy generation optimization. Two more realistic surface conditions, zero nanoparticles normal flux and velocity slip are utilized at the radially moving surface. The fundamental equations of entropy generation rate, nanoparticles concentration, Bejan number, thermal energy as well as momentum for the Williamson nanofluid in axisymmetric case are modeled with the help of boundary layer analysis. Highly nonlinear ODEs are received from leading PDEs with the help of nondimensional transformation and then solved numerically through shooting Fehlberg approach. Surface drag force and Nusselt number are also computed. Fabulous numerical outcomes are achieved and compared with the existing study and found to be in outstanding agreement. It is important to find that entropy generation rate grows for larger estimation of Brinkmann number. Moreover, Bejan number is depressed for escalating Eckert number. Furthermore, nanoparticles concentration is a growing function of activation energy parameter.

ACS Style

Muhammad Azam; Fazle Mabood; Tianzhou Xu; Mohamed Waly; Iskander Tlili. Entropy optimized radiative heat transportation in axisymmetric flow of Williamson nanofluid with activation energy. Results in Physics 2020, 19, 103576 .

AMA Style

Muhammad Azam, Fazle Mabood, Tianzhou Xu, Mohamed Waly, Iskander Tlili. Entropy optimized radiative heat transportation in axisymmetric flow of Williamson nanofluid with activation energy. Results in Physics. 2020; 19 ():103576.

Chicago/Turabian Style

Muhammad Azam; Fazle Mabood; Tianzhou Xu; Mohamed Waly; Iskander Tlili. 2020. "Entropy optimized radiative heat transportation in axisymmetric flow of Williamson nanofluid with activation energy." Results in Physics 19, no. : 103576.

Short communication
Published: 04 November 2020 in Case Studies in Thermal Engineering
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Present study is dealing the effects of carbon particles on MHD three-dimensional axisymmetric flow of water along a permeable stretched surface. Dissipation effects are also considered along two lateral directions (x-and y-directions). Single and Multiple wall carbon nanotubes (SWCNTs and MWCNTs) that comprise the superb thermal conductivity are also inspected. A modified relation for effective thermal conductivity of carbon nanotube that depends upon radius of particle is used to construct the mathematical model. Physical quantities of interest are also developed in terms of skin friction coefficient and local Nusselt number. Obtained results are developed from a system of nonlinear equations via numerically scheme (Runge-Kutta fourth order method). All obtained results for velocity and temperature profile are depends upon emerging parameters such as: Hartmann number M, nanoparticle volume fraction ϕ, Prandtl number Pr, suction/injection parameter S, and dissipation parameters Ec, Ecx and Ecy. Entire analysis described that results for SWCNTs provides the better heat transfer rate as compared to MWCNTs. It is further found that skin friction provides the dominant friction at the surface for suction cases.

ACS Style

R.U. Haq; S.T. Hussain; M.Z. Ullah; A.S. Alshomrani; Iskander Tlili. Analysis of water driven CNTs along an axisymmetric surface with viscous dissipation effect. Case Studies in Thermal Engineering 2020, 22, 100779 .

AMA Style

R.U. Haq, S.T. Hussain, M.Z. Ullah, A.S. Alshomrani, Iskander Tlili. Analysis of water driven CNTs along an axisymmetric surface with viscous dissipation effect. Case Studies in Thermal Engineering. 2020; 22 ():100779.

Chicago/Turabian Style

R.U. Haq; S.T. Hussain; M.Z. Ullah; A.S. Alshomrani; Iskander Tlili. 2020. "Analysis of water driven CNTs along an axisymmetric surface with viscous dissipation effect." Case Studies in Thermal Engineering 22, no. : 100779.

Journal article
Published: 27 October 2020 in Ain Shams Engineering Journal
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The flow and energy transport of water-ethylene glycol (EG) based Ti-Cu hybrid nanofluid due to incessantly poignant needle in magnetohydrodynamic Sakiadis flow with resistive heating is investigated. We scrutinized the flow and heat transfer of the Blasius and free stream flows. The governing Partial Differential Equations are transformed as Ordinary Differential Equations using suitable similarities and resolved numerically using RK (Runge-Kutta) based shooting procedure. Numerical and graphical outcomes are explored and examined for the drive, thermal transport, surface friction and local Nusselt number of various pertinent parameters. It is originate that the flow and thermal boundary layer of Blasius and Sakiadis flows are not equal. The rate of energy transport is high in moving needle in the static fluid when equated with the fixed needle in dynamic fluid. It is also established that the rate of heat transfer in Ti-Cu/EG-water hybrid nanofluid is more than water-EG/Ti nanofluid.

ACS Style

Iskander Tlili; Hossam A. Nabwey; M.Girinath Reddy; N. Sandeep; Maddileti Pasupula. Effect of resistive heating on incessantly poignant thin needle in magnetohydrodynamic Sakiadis hybrid nanofluid. Ain Shams Engineering Journal 2020, 12, 1025 -1032.

AMA Style

Iskander Tlili, Hossam A. Nabwey, M.Girinath Reddy, N. Sandeep, Maddileti Pasupula. Effect of resistive heating on incessantly poignant thin needle in magnetohydrodynamic Sakiadis hybrid nanofluid. Ain Shams Engineering Journal. 2020; 12 (1):1025-1032.

Chicago/Turabian Style

Iskander Tlili; Hossam A. Nabwey; M.Girinath Reddy; N. Sandeep; Maddileti Pasupula. 2020. "Effect of resistive heating on incessantly poignant thin needle in magnetohydrodynamic Sakiadis hybrid nanofluid." Ain Shams Engineering Journal 12, no. 1: 1025-1032.

Research article
Published: 22 October 2020 in Advances in Mechanical Engineering
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This article investigates the heat and mass transfer in flow of bi-viscosity fluid through a porous saturated curved channel with sinusoidally deformed walls. The magnetic field and Joule heating effects are also taken into account. The equations describing the flow and heat/mass transfer are developed using curvilinear coordinates. A reduction of these equations is made based on lubrication approximation. The reduced linear ordinary differential equations are integrated numerically using an implicit finite difference scheme. It is observed that, the bi-viscosity fluid parameter, permeability parameter, and Hartmann number have analogous effects on the longitudinal velocity. Moreover, temperature of the fluid, heat coefficient, and mass concentration increase by increasing bi-viscosity fluid parameter, Brinkmann number, and Hartmann number. Further, mass concentration increases by increasing the rate of chemical reaction and bi-viscosity parameter. The size of circulating roll in lower half of the channel boosts up with larger variation of bi-viscosity parameter and permeability parameter. The flow patterns in the channel illustrating the effects of bi-viscosity parameter, permeability parameter, and Hartmann number are also displayed.

ACS Style

Raheel Ahmed; Nasir Ali; Sami Ullah Khan; Ali Chamkha; Iskander Tlili. Heat and mass transfer characteristics in flow of bi-viscosity fluid through a curved channel with contracting and expanding walls: A finite difference approach. Advances in Mechanical Engineering 2020, 12, 1 .

AMA Style

Raheel Ahmed, Nasir Ali, Sami Ullah Khan, Ali Chamkha, Iskander Tlili. Heat and mass transfer characteristics in flow of bi-viscosity fluid through a curved channel with contracting and expanding walls: A finite difference approach. Advances in Mechanical Engineering. 2020; 12 (10):1.

Chicago/Turabian Style

Raheel Ahmed; Nasir Ali; Sami Ullah Khan; Ali Chamkha; Iskander Tlili. 2020. "Heat and mass transfer characteristics in flow of bi-viscosity fluid through a curved channel with contracting and expanding walls: A finite difference approach." Advances in Mechanical Engineering 12, no. 10: 1.

Withdrawal
Published: 22 October 2020 in Chinese Journal of Physics
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In this article, the free convection flow of viscous fluid in a cylindrical tube is studied in the presence of the transverse magnetic field. The thermal transport equation is generalized by means of Capto-Fabrizio fractional integral operator. The solutions are found by using integral transforms more exactly Laplace and finite Hankel transforms. The ordinary model is recovered as a special case by taking the limit and some other special cases are considered. The effects of fractional and physical parameters are graphically underlined. The influence of the fractional parameter on temperature and velocity for a small and large value of time is different.

ACS Style

Nehad Ali Shah; Aziz Ullah Awan; Rabia Khan; Iskander Tlili; M. Umar Farooq; Bashir Salah. WITHDRAWN: Free convection Hartmann flow of a viscous fluid with damped thermal transport through cylindrical tube. Chinese Journal of Physics 2020, 1 .

AMA Style

Nehad Ali Shah, Aziz Ullah Awan, Rabia Khan, Iskander Tlili, M. Umar Farooq, Bashir Salah. WITHDRAWN: Free convection Hartmann flow of a viscous fluid with damped thermal transport through cylindrical tube. Chinese Journal of Physics. 2020; ():1.

Chicago/Turabian Style

Nehad Ali Shah; Aziz Ullah Awan; Rabia Khan; Iskander Tlili; M. Umar Farooq; Bashir Salah. 2020. "WITHDRAWN: Free convection Hartmann flow of a viscous fluid with damped thermal transport through cylindrical tube." Chinese Journal of Physics , no. : 1.

Journal article
Published: 14 October 2020 in Sustainability
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Currently, among the topologies of wind energy conversion systems, those based on full power converters are growing. The permanent magnet synchronous generator (PMSG) uses full power converter to allow wide speed ranges to extract the maximum power from the wind. In order to obtain efficient vector control in a synchronous generator with permanent magnets, it is necessary to know the position of the rotor. The PMSGs work over a wide range of speed, and it is mandatory to measure or estimate their speed and position. Usually, the position of the rotor is obtained through Resolver or Encoder. However, the presence of these sensor elements increases the cost, in addition to reducing the system’s reliability. Moreover, in high wind power turbine, the measured wind speed by the anemometer is taken at the level of the blades which makes the measurement of the wind speed at a single point inaccurate. This paper is a study on the sensorless control that removes the rotor position, speed sensors and anemometer from the speed control. The estimation of the rotor position is based on the output of a rotor current controller and the wind speed estimator is based on the opposition-based learning (OBL), particle swarm optimization and support vector regression.

ACS Style

Ahmed Abo-Khalil; Ali Eltamaly; Praveen R.P.; Ali Alghamdi; Iskander Tlili. A Sensorless Wind Speed and Rotor Position Control of PMSG in Wind Power Generation Systems. Sustainability 2020, 12, 8481 .

AMA Style

Ahmed Abo-Khalil, Ali Eltamaly, Praveen R.P., Ali Alghamdi, Iskander Tlili. A Sensorless Wind Speed and Rotor Position Control of PMSG in Wind Power Generation Systems. Sustainability. 2020; 12 (20):8481.

Chicago/Turabian Style

Ahmed Abo-Khalil; Ali Eltamaly; Praveen R.P.; Ali Alghamdi; Iskander Tlili. 2020. "A Sensorless Wind Speed and Rotor Position Control of PMSG in Wind Power Generation Systems." Sustainability 12, no. 20: 8481.

Journal article
Published: 10 October 2020 in International Communications in Heat and Mass Transfer
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Analysis of natural convection due to various positions of bottom heated fin is performed in a square cavity that is filled by water-based Single Wall Carbon Nanotubes (SWCNTs) via finite element method (FEM). Three vertical parallel fins and one top horizontal fin is also placed inside the cavity. The upper surface of the cavity is adiabatic, however the rest of three parts of the square cavity are cold. Convection is driven through lower horizontal and vertically central heated fins. For convection, horizontal and middle vertical fins are heated with uniform temperature Th and remaining vertical parallel fins are fixed as cold (Tc). Mathematical structure is constructed in the form of system of nonlinear partial differential equations (PDEs) with constraint at the surface. Expressions of nanofluid relations are incorporated into the model. Effective thermal conductivity model includes the radius of nanoparticle and fluid molecules at nanoscale. Dimensionless form of PDEs are tackled through Galerkin technique-based Finite Element Method. Results are obtained for temperature profile and stream function that includes emerging parameters such as: Rayleigh number (Ra), nanoparticle fraction (ϕ), position of heated horizontal fin, variation in length forbottom heated fin (HT), Hartmann number (Ha) and effect of middle vertical fin (adiabatic, cold, hot). The analysis describes the significant effect of heat transfer in the presence of nanoparticle, heated length of bottom fin. Heat transfer rate increases by enlarging the heated length of the lower horizontal fin, and decreases by improving the value of Ra and solid volume fraction of nanoparticles.

ACS Style

Rizwan Ul Haq; Syed Saqib Shah; Ebrahem A. Algehyne; Iskander Tlili. Heat transfer analysis of water based SWCNTs through parallel fins enclosed by square cavity. International Communications in Heat and Mass Transfer 2020, 119, 104797 .

AMA Style

Rizwan Ul Haq, Syed Saqib Shah, Ebrahem A. Algehyne, Iskander Tlili. Heat transfer analysis of water based SWCNTs through parallel fins enclosed by square cavity. International Communications in Heat and Mass Transfer. 2020; 119 ():104797.

Chicago/Turabian Style

Rizwan Ul Haq; Syed Saqib Shah; Ebrahem A. Algehyne; Iskander Tlili. 2020. "Heat transfer analysis of water based SWCNTs through parallel fins enclosed by square cavity." International Communications in Heat and Mass Transfer 119, no. : 104797.