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The outbreak of COVID-19 necessitates developing reliable tools to derive safety measures, including safe social distance and minimum exposure time under different circumstances. Transient Eulerian–Lagrangian computational fluid dynamics (CFD) models have emerged as a viably fast and economical option. Nonetheless, these CFD models resolve the instantaneous distribution of droplets inside a computational domain, making them incapable of directly being used to assess the risk of infection as it depends on the total accumulated dosage of infecting viruses received by a new host within an exposure time. This study proposes a novel risk assessment model (RAM) to predict the temporal and spatial accumulative concentration of infectious exhaled droplets based on the bio-source’s exhalation profile and droplet distribution using the CFD results of respiratory events in various environmental conditions. Unlike the traditional approach in the bulk movement assessment of droplets’ outreach in a domain, every single droplet is traced inside the domain at each time step, and the total number of droplets passing through any arbitrary position of the domain is determined using a computational code. The performance of RAM is investigated for a series of case studies against various respiratory events where the horizontal and the lateral spread of risky zones are shown to temporarily vary rather than being fixed in space. The sensitivity of risky zones to ambient temperature and relative humidity was also addressed for sample cough and sneeze cases. This implies that the RAM provides crucial information required for defining safety measures such as safety distances or minimum exposure times in different environments.
Hamid Motamedi Zoka; Mohammad Moshfeghi; Hadi Bordbar; Parham Mirzaei; Yahya Sheikhnejad. A CFD Approach for Risk Assessment Based on Airborne Pathogen Transmission. Atmosphere 2021, 12, 986 .
AMA StyleHamid Motamedi Zoka, Mohammad Moshfeghi, Hadi Bordbar, Parham Mirzaei, Yahya Sheikhnejad. A CFD Approach for Risk Assessment Based on Airborne Pathogen Transmission. Atmosphere. 2021; 12 (8):986.
Chicago/Turabian StyleHamid Motamedi Zoka; Mohammad Moshfeghi; Hadi Bordbar; Parham Mirzaei; Yahya Sheikhnejad. 2021. "A CFD Approach for Risk Assessment Based on Airborne Pathogen Transmission." Atmosphere 12, no. 8: 986.
This study steps into the roadmap of agenda 2030 to mitigate the human footprint on an environment with the aim of management of energy consumption in residential/commercial buildings. In order to materialize this concept, a new generation of adaptable systems of intelligent supervisory predictive control (ISPC) is introduced and implemented in which energy consumption tends to be minimized without sacrificing occupants thermal comfort. The methodology of ISPC includes building thermal simulation and multi-objective optimization algorithm that interact with conventional machine-level controllers of HVAC systems, to define optimized setpoints considering current and forecasted operation conditions. The development of a reliable surrogate model, based on robust machine learning techniques, is a key feature to confer greenness to a building in order to promote sustainability in the built environment and finally to have a smart green building. It is showed that the proposed ISPC is capable of delivering a robust, energy- and cost-effective decision while being independent of the HVAC system. The implemented energy management, as a non-destructive retrofitting procedure, can be applied to both new and existing buildings and with any level of HVAC technology.
Diogo Gonçalves; Yahya Sheikhnejad; Mónica Oliveira; Nelson Martins. One step forward toward smart city Utopia: Smart building energy management based on adaptive surrogate modelling. Energy and Buildings 2020, 223, 110146 .
AMA StyleDiogo Gonçalves, Yahya Sheikhnejad, Mónica Oliveira, Nelson Martins. One step forward toward smart city Utopia: Smart building energy management based on adaptive surrogate modelling. Energy and Buildings. 2020; 223 ():110146.
Chicago/Turabian StyleDiogo Gonçalves; Yahya Sheikhnejad; Mónica Oliveira; Nelson Martins. 2020. "One step forward toward smart city Utopia: Smart building energy management based on adaptive surrogate modelling." Energy and Buildings 223, no. : 110146.
A countless amount of energy has been wasted in all kinds of expansion valves (EV) in industries. In fact, EVs, including regulators, throttling valves, capillary tubes, etc., have been used to intentionally reduce the potential of carrier fluid. City gate stations (CGS) have been recognized as one of the important points with high potential for energy harvesting due to its function for regulating natural gas (NG) pressure by EV. In this study, Tesla turbine (TT) is introduced as a new candidate for substitution of EV, particularly those that have been employed in CGS on high-pressure NG pipelines, as well as those applications in which high-potential fluid must be reduced to a low-potential state to form a complete thermodynamic cycle or to be used at end-user equipment. Although harvesting energy is one of the hottest fields of science and engineering, there are few traces of research on using a TT as an alternative for EVs, even for the industries possessing high-pressure lines. This numerical experiment intends to show the capability of TT as a robust candidate for substituting regulation valves through investigating thermohydrodynamic characteristics of the turbulent high-pressure compressible NG flow through a TT under different operation conditions. This study, with the objective of managing the exploitation of resources, can be considered as one step forward toward reinforcing economic and environmental pillars of sustainable development. It is also found that the generated power by TT can support the 285 7W LED simultaneously, or it is equivalent to 84.4 m2 area of the solar panel (150 W, 15.42% efficiency) for the climate condition of Toronto, Canada.
Yahya Sheikhnejad; João Simões; Nelson Martins. Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines. Energies 2020, 13, 956 .
AMA StyleYahya Sheikhnejad, João Simões, Nelson Martins. Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines. Energies. 2020; 13 (4):956.
Chicago/Turabian StyleYahya Sheikhnejad; João Simões; Nelson Martins. 2020. "Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines." Energies 13, no. 4: 956.
Urban and rural areas are the cradles of human development and civilization as all practical progress and feasible products have emerged from these places. Having a clear understanding of the sustainability of these areas, especially the progress of research in this field, is highly important. This study undertakes a comprehensive scientometric analysis to visualize and quantitatively measure the outcome of the scientific enterprise to construct sustainable urban and rural areas. The scientific productivity of recorded publications, their impacts, and their importance were systematically measured in diverse aspects by virtue of ten distinctive techniques. A critical assessment of the respected criteria for sustainable urban and rural areas is presented in order to further clarify its boundaries with other related topics, as well as providing a clear benchmark for future studies. After screening the search results between 1900 and 2018 on the Web of Science database, 7397 publications explicitly related to sustainable urban and rural areas were extracted and analyzed by the CiteSpace software via the relevant bibliometric indicators. The results of this study shed light on the trends and patterns, consisting of kernel research areas, countries, journals, institutions, and how these entities have been concatenated, inside the bibliographic records around sustainable urban and rural areas. The findings facilitate in identifying the barriers and weakness in the current sustainable urban and rural areas research, and consequently help in identifying auspicious directions for prospective investigations.
Yahya Sheikhnejad; Tan Yigitcanlar. Scientific Landscape of Sustainable Urban and Rural Areas Research: A Systematic Scientometric Analysis. Sustainability 2020, 12, 1293 .
AMA StyleYahya Sheikhnejad, Tan Yigitcanlar. Scientific Landscape of Sustainable Urban and Rural Areas Research: A Systematic Scientometric Analysis. Sustainability. 2020; 12 (4):1293.
Chicago/Turabian StyleYahya Sheikhnejad; Tan Yigitcanlar. 2020. "Scientific Landscape of Sustainable Urban and Rural Areas Research: A Systematic Scientometric Analysis." Sustainability 12, no. 4: 1293.
In this study, a new application of a Tesla turbine (TT) is presented in which a TT is introduced as a promising solution to enhance the energy efficiency of refrigeration cycles. For this special purpose, a TT is represented as a regenerative system that minimizes the wasted energy without compromising the system output quality or sacrificing standards of design and move one step forward, towards more sustainable industries. To achieve this goal, a 3D thermohydrodynamic analysis of the Newtonian turbulent compressible flow of high-pressure methane through a Tesla turbine has been performed under different configurations and operational conditions. Methane was defined as a real gas through the Redlich–Kwong equation of state. The complex unstructured grid generation was employed to produce a low-skewness mesh for a CFD model on the commercial software of ANSYS Fluent for simulation of heat and mass transfer by FVM. As a result of the present study, practical design rules are proposed to support engineers defining optimized TTs for predetermined operating conditions, namely regarding power output, disc sizes and angular velocity.
Yahya Sheikhnejad; João Simões; Nelson Martins. Introducing Tesla turbine to enhance energy efficiency of refrigeration cycle. Energy Reports 2020, 6, 358 -363.
AMA StyleYahya Sheikhnejad, João Simões, Nelson Martins. Introducing Tesla turbine to enhance energy efficiency of refrigeration cycle. Energy Reports. 2020; 6 ():358-363.
Chicago/Turabian StyleYahya Sheikhnejad; João Simões; Nelson Martins. 2020. "Introducing Tesla turbine to enhance energy efficiency of refrigeration cycle." Energy Reports 6, no. : 358-363.
Behrouz Nemati; Sara Zandi; Babak Aminnejad; Mahsa Davarazar; Yahya Sheikhnejad; Dina JahanianFard; Amid Mostafaie. "Building Information Modelling Execution in Administrative and Commercial Spaces in Iran – A Fuzzy-Delphi Criteria Prioritization ". Journal of Settlements and Spatial Planning 2019, SI, 17 -27.
AMA StyleBehrouz Nemati, Sara Zandi, Babak Aminnejad, Mahsa Davarazar, Yahya Sheikhnejad, Dina JahanianFard, Amid Mostafaie. "Building Information Modelling Execution in Administrative and Commercial Spaces in Iran – A Fuzzy-Delphi Criteria Prioritization ". Journal of Settlements and Spatial Planning. 2019; SI (6):17-27.
Chicago/Turabian StyleBehrouz Nemati; Sara Zandi; Babak Aminnejad; Mahsa Davarazar; Yahya Sheikhnejad; Dina JahanianFard; Amid Mostafaie. 2019. ""Building Information Modelling Execution in Administrative and Commercial Spaces in Iran – A Fuzzy-Delphi Criteria Prioritization "." Journal of Settlements and Spatial Planning SI, no. 6: 17-27.
This study addresses a new generation of adaptable intelligent control systems for energy management. The proposed approach consists of a high-level predictive control system based on advanced simulation and optimization algorithms which interact with conventional machine-level controllers of HVAC systems, e.g., PID, in order to define optimized set points considering current and forecasted operation conditions, minimizing a predefined objective cost function, e.g., energy consumption, subjected to maintain predefined levels of comfort. The flexibility of the proposed architecture and the development of reliable surrogate models based on robust machine learning techniques are key features to combine green building requirements while granting or even improving occupant comfort. A first version of the proposed system was developed, and preliminary results emphasize its role in the path of transition to intelligent green buildings as a part of new buildings or, more important, as a retrofit of current buildings, with almost no changes on infrastructures, but promoting them to a smart building level.
Y. Sheikhnejad; D. Gonçalves; Mónica Oliveira; Nelson Martins. Can buildings be more intelligent than users?- The role of intelligent supervision concept integrated into building predictive control. Energy Reports 2019, 6, 409 -416.
AMA StyleY. Sheikhnejad, D. Gonçalves, Mónica Oliveira, Nelson Martins. Can buildings be more intelligent than users?- The role of intelligent supervision concept integrated into building predictive control. Energy Reports. 2019; 6 ():409-416.
Chicago/Turabian StyleY. Sheikhnejad; D. Gonçalves; Mónica Oliveira; Nelson Martins. 2019. "Can buildings be more intelligent than users?- The role of intelligent supervision concept integrated into building predictive control." Energy Reports 6, no. : 409-416.
In the current global situation, the release of large amounts of potential effluents into the environment is considered as one of the most important and challenging issues. Innovations in the treatment methods to deal with this problem are among the research priorities within the scientific communities. Even though innumerable methods including physicochemical and biological have been used, yet no proper sustainability of the methods have been introduced. Membrane bioreactors (MBRs) have gained world-wide attention in recent years, but still there is no report in the literature to map the global research on this subject. The present manuscript describes a scientometric study on the global trend on the application of MBRs during the period 1991–2018 by employing variables such as: (1) distribution of documents over the adopted duration, (2) type of documents in this area, (3) rate of contribution among the different countries, (4) rate of cooperation among the authors, (5) frequency of the keywords co-occurring, (6) cited authors, (7) cited journals, (8) the frequency of categories appeared and (9) the cited documents. A total of 2452 bibliographic records from the Web of Science database were retrieved and analysed to generate results, thereby to create geospatial maps for a better understanding. The findings reveal an increase in the number of papers published in the world, especially China and USA being the top. The existing studies in MBRs research focus mainly on subject categories of the performance and fouling as the main criteria of the sustainable application of MBRs. This study therefore, provides an extensive understanding about the trends and research patterns of MBRs efforts worldwide.
Sara Zandi; Behrouz Nemati; Dina JahanianFard; Mahsa Davarazar; Yahya Sheikhnejad; Amid Mostafaie; Mohammadreza Kamali; Tejraj M. Aminabhavi. Industrial biowastes treatment using membrane bioreactors (MBRs) -a scientometric study. Journal of Environmental Management 2019, 247, 462 -473.
AMA StyleSara Zandi, Behrouz Nemati, Dina JahanianFard, Mahsa Davarazar, Yahya Sheikhnejad, Amid Mostafaie, Mohammadreza Kamali, Tejraj M. Aminabhavi. Industrial biowastes treatment using membrane bioreactors (MBRs) -a scientometric study. Journal of Environmental Management. 2019; 247 ():462-473.
Chicago/Turabian StyleSara Zandi; Behrouz Nemati; Dina JahanianFard; Mahsa Davarazar; Yahya Sheikhnejad; Amid Mostafaie; Mohammadreza Kamali; Tejraj M. Aminabhavi. 2019. "Industrial biowastes treatment using membrane bioreactors (MBRs) -a scientometric study." Journal of Environmental Management 247, no. : 462-473.
In this study, a scientometric comprehensive analysis has been executed in order to explore the scientific situation of research efforts performed previously with regard underground CO2 sequestration and encapsulation. To this end, a total of 1280 bibliographic records from the Web of Science (WoS) database were extracted and analysed to report the analysis of scientific state of the authors, journals, countries, and categories. Eventually, geospatial maps of the progress in this field are created and presented. As per the results obtained, efforts on this subject have been initiated significantly since 1990s. Scientific articles and proceeding papers share nearly 63% and 31% of the documents published. The results indicate that USA and China are the most contributing countries. Among the active journals, international journal of greenhouse gas control impact is the most active journal. It may be concluded that no highly active research group has yet been emerged. Hence, more supports and scientific efforts are needed to promote carbon dioxide capture and storage technologies.
Mahsa Davarazar; Dina JahanianFard; Yahya Sheikhnejad; Behrouz Nemati; Amid Mostafaie; Sara Zandi; Mohammadreza Khalaj; Mohammadreza Kamali; Tejraj M. Aminabhavi. Underground carbon dioxide sequestration for climate change mitigation – A scientometric study. Journal of CO2 Utilization 2019, 33, 179 -188.
AMA StyleMahsa Davarazar, Dina JahanianFard, Yahya Sheikhnejad, Behrouz Nemati, Amid Mostafaie, Sara Zandi, Mohammadreza Khalaj, Mohammadreza Kamali, Tejraj M. Aminabhavi. Underground carbon dioxide sequestration for climate change mitigation – A scientometric study. Journal of CO2 Utilization. 2019; 33 ():179-188.
Chicago/Turabian StyleMahsa Davarazar; Dina JahanianFard; Yahya Sheikhnejad; Behrouz Nemati; Amid Mostafaie; Sara Zandi; Mohammadreza Khalaj; Mohammadreza Kamali; Tejraj M. Aminabhavi. 2019. "Underground carbon dioxide sequestration for climate change mitigation – A scientometric study." Journal of CO2 Utilization 33, no. : 179-188.
In this experimental-numerical study, effects of transverse magnetic field of parallel magnet bars perpendicular to the fluid flow direction and partially filled porous media are investigated. Moreover, constant heat flux is applied on the outer surface of a circular straight horizontal pipe and concentric porous media is embedded inside it. Magnet bars are located right at the entrance of pipe and a thick layer of insulation is wrapped the pipe to prevent heat loss. In addition, a 3D numerical simulation is performed using CFD techniques to capture the influence of these two factors on the thermohydrodynamic behavior of ferrofluid flow. Hybrid scheme of finite volume method and SIMPLE algorithm are employed to discretize and solve governing equations as well as TDMA for solving the linear algebraic matrix equation. Mineral oil is used as a base fluid and ferrofluid with three different volume fractions 0.5, 1 and 2% are prepared for the experiment. Finally prepared experimental setup configuration in this investigation leads to this conclusion that in comparison with magnetic field, although porous media induce more unfavorable pressure loss, it will bring more heat transfer enhancement as well.
Yahya Sheikhnejad; Amir B. Ansari; Jorge A. F. Ferreira; Nelson Martins. Effects of parallel magnet bars and partially filled porous media on magneto-thermo-hydro-dynamic characteristics of pipe ferroconvection. International Journal of Heat and Mass Transfer 2019, 136, 1273 -1281.
AMA StyleYahya Sheikhnejad, Amir B. Ansari, Jorge A. F. Ferreira, Nelson Martins. Effects of parallel magnet bars and partially filled porous media on magneto-thermo-hydro-dynamic characteristics of pipe ferroconvection. International Journal of Heat and Mass Transfer. 2019; 136 ():1273-1281.
Chicago/Turabian StyleYahya Sheikhnejad; Amir B. Ansari; Jorge A. F. Ferreira; Nelson Martins. 2019. "Effects of parallel magnet bars and partially filled porous media on magneto-thermo-hydro-dynamic characteristics of pipe ferroconvection." International Journal of Heat and Mass Transfer 136, no. : 1273-1281.
Yahya Sheikhnejad; Zoran Vujicic; Álvaro Almeida; Ricardo Bastos; Ali Shahparia; António Teixeira. Analytical transient analysis of Peltier device for laser thermal tuning. Third International Conference on Applications of Optics and Photonics 2017, 1 .
AMA StyleYahya Sheikhnejad, Zoran Vujicic, Álvaro Almeida, Ricardo Bastos, Ali Shahparia, António Teixeira. Analytical transient analysis of Peltier device for laser thermal tuning. Third International Conference on Applications of Optics and Photonics. 2017; ():1.
Chicago/Turabian StyleYahya Sheikhnejad; Zoran Vujicic; Álvaro Almeida; Ricardo Bastos; Ali Shahparia; António Teixeira. 2017. "Analytical transient analysis of Peltier device for laser thermal tuning." Third International Conference on Applications of Optics and Photonics , no. : 1.
This study includes experimental and three-dimensional numerical analysis of conjugate steady-state laminar forced ferroconvection of Newtonian incompressible ferrofluid through a horizontal circular pipe under constant heat flux and in presence of transverse magnetic field. The magnetic field was applied by two fixed parallel magnet bars at the beginning of the tube. To validate the thermohydrodynamic characteristics obtained by numerical results, appropriate experimental setup with accurate instrumentations was conducted. Based on presence and absence of porous media and solid rod inside of pipe, six conditions were compared for quantifying the heat transfer enhancement and effectiveness. Governing equations were discretized by finite volume method (FVM) and solved using the semi-implicit method for pressure linked equations (SIMPLE) algorithm and computational fluid dynamic (CFD) techniques. It was found that magnetic field, porous media, and solid rod increase heat transfer and pressure loss in the pipe such that solid rod has the best effect on heat transfer and worst effect on effectiveness.
Yahya Sheikhnejad; Mir Mehrdad Hosseini; Antonio Teixeira; Ali Shahpari; Reza Hosseini; Majid Saffar Avval. Experimental Investigation and Three-Dimensional Numerical Analysis of Ferroconvection Through Horizontal Tube Under Magnetic Field of Fixed Parallel Magnet Bars. Journal of Heat Transfer 2017, 139, 101703 .
AMA StyleYahya Sheikhnejad, Mir Mehrdad Hosseini, Antonio Teixeira, Ali Shahpari, Reza Hosseini, Majid Saffar Avval. Experimental Investigation and Three-Dimensional Numerical Analysis of Ferroconvection Through Horizontal Tube Under Magnetic Field of Fixed Parallel Magnet Bars. Journal of Heat Transfer. 2017; 139 (10):101703.
Chicago/Turabian StyleYahya Sheikhnejad; Mir Mehrdad Hosseini; Antonio Teixeira; Ali Shahpari; Reza Hosseini; Majid Saffar Avval. 2017. "Experimental Investigation and Three-Dimensional Numerical Analysis of Ferroconvection Through Horizontal Tube Under Magnetic Field of Fixed Parallel Magnet Bars." Journal of Heat Transfer 139, no. 10: 101703.
Álvaro J. Almeida; Ali Shahpari; Zoran Vujicic; Yahya Sheikhnejad; Francisco Rodrigues; António L. Teixeira. Simplified model for power penalty when using PIN and APD receivers. Optics Communications 2017, 392, 15 -19.
AMA StyleÁlvaro J. Almeida, Ali Shahpari, Zoran Vujicic, Yahya Sheikhnejad, Francisco Rodrigues, António L. Teixeira. Simplified model for power penalty when using PIN and APD receivers. Optics Communications. 2017; 392 ():15-19.
Chicago/Turabian StyleÁlvaro J. Almeida; Ali Shahpari; Zoran Vujicic; Yahya Sheikhnejad; Francisco Rodrigues; António L. Teixeira. 2017. "Simplified model for power penalty when using PIN and APD receivers." Optics Communications 392, no. : 15-19.
In any wavelength sensitive application, extensive care should be taken in addressing the wavelength drift issues. In the case that laser tuning is conducted by using thermoelectric cooler, an accurate expression is needed to describe transient characteristics of Peltier device to achieve maximum controllability. In addition, thermal tuning issues are of particular relevance to the field of photonic integration. In this study, the exact solution of the governing equation is presented considering Joule heating, heat conduction, heat flux of laser diode and thermoelectric effect in one dimension. In addition, variable separation method and Sturm-Liouville theorem, along with the completeness features of eigenfunctions, are used to obtain time-dependent electrical potential and temperature distribution of the Peltier device. Additionally, steady state sensitivity analysis is performed in order to demonstrate the impacts of physical parameters on its thermoelectric characteristics. Transient temperature is also considered which, for a specific case, revealed fast transition to steady state condition with time constant lower than 400 ms. Lower heat capacity as well as laser diode heat flux might lead to faster Peltier response times, such that the effect of heat flux on response time becomes negligible in low heat capacity Peltier.
Yahya Sheikhnejad; Ricardo Bastos; Zoran Vujicic; Ali Shahpari; Antonio Teixeira. Laser Thermal Tuning by Transient Analytical Analysis of Peltier Device. IEEE Photonics Journal 2017, 9, 1 -1.
AMA StyleYahya Sheikhnejad, Ricardo Bastos, Zoran Vujicic, Ali Shahpari, Antonio Teixeira. Laser Thermal Tuning by Transient Analytical Analysis of Peltier Device. IEEE Photonics Journal. 2017; 9 (3):1-1.
Chicago/Turabian StyleYahya Sheikhnejad; Ricardo Bastos; Zoran Vujicic; Ali Shahpari; Antonio Teixeira. 2017. "Laser Thermal Tuning by Transient Analytical Analysis of Peltier Device." IEEE Photonics Journal 9, no. 3: 1-1.
Yahya Sheikhnejad; Reza Hosseini; Majid Saffar Avval. Experimental study on heat transfer enhancement of laminar ferrofluid flow in horizontal tube partially filled porous media under fixed parallel magnet bars. Journal of Magnetism and Magnetic Materials 2017, 424, 16 -25.
AMA StyleYahya Sheikhnejad, Reza Hosseini, Majid Saffar Avval. Experimental study on heat transfer enhancement of laminar ferrofluid flow in horizontal tube partially filled porous media under fixed parallel magnet bars. Journal of Magnetism and Magnetic Materials. 2017; 424 ():16-25.
Chicago/Turabian StyleYahya Sheikhnejad; Reza Hosseini; Majid Saffar Avval. 2017. "Experimental study on heat transfer enhancement of laminar ferrofluid flow in horizontal tube partially filled porous media under fixed parallel magnet bars." Journal of Magnetism and Magnetic Materials 424, no. : 16-25.
Yahya Sheikhnejad; Reza Hosseini; Majid Saffar-Avval. Effect of different magnetic field distributions on laminar ferroconvection heat transfer in horizontal tube. Journal of Magnetism and Magnetic Materials 2015, 389, 136 -143.
AMA StyleYahya Sheikhnejad, Reza Hosseini, Majid Saffar-Avval. Effect of different magnetic field distributions on laminar ferroconvection heat transfer in horizontal tube. Journal of Magnetism and Magnetic Materials. 2015; 389 ():136-143.
Chicago/Turabian StyleYahya Sheikhnejad; Reza Hosseini; Majid Saffar-Avval. 2015. "Effect of different magnetic field distributions on laminar ferroconvection heat transfer in horizontal tube." Journal of Magnetism and Magnetic Materials 389, no. : 136-143.
Yahya Sheikhnejad; Reza Hosseini; Majid Saffar Avval. LAMINAR FORCED CONVECTION OF FERROFLUID IN A HORIZONTAL TUBE PARTIALLY FILLED WITH POROUS MEDIA IN THE PRESENCE OF A MAGNETIC FIELD. Journal of Porous Media 2015, 18, 437 -448.
AMA StyleYahya Sheikhnejad, Reza Hosseini, Majid Saffar Avval. LAMINAR FORCED CONVECTION OF FERROFLUID IN A HORIZONTAL TUBE PARTIALLY FILLED WITH POROUS MEDIA IN THE PRESENCE OF A MAGNETIC FIELD. Journal of Porous Media. 2015; 18 (4):437-448.
Chicago/Turabian StyleYahya Sheikhnejad; Reza Hosseini; Majid Saffar Avval. 2015. "LAMINAR FORCED CONVECTION OF FERROFLUID IN A HORIZONTAL TUBE PARTIALLY FILLED WITH POROUS MEDIA IN THE PRESENCE OF A MAGNETIC FIELD." Journal of Porous Media 18, no. 4: 437-448.
In this study, hydrodynamic characteristics of finite length journal bearings running with incompressible laminar flow under magnetic field are investigated. Ferrofluid as a lubricant contains nanoparticles of magnetite (Fe3O4). The analysis is based on the numerical solution of the full Navier-Stokes equations using computational fluid dynamics techniques. Considering the complexity of the physical geometry, conformal mapping is used to generate an orthogonal grid, and the governing equations are transformed in the computational domain. Discretized forms of the transformed equations are obtained by the control volume method and solved by the SIMPLE algorithm. Results indicated that when compared with the conventional lubricant, the ferrofluid as a lubricant enhances the hydrodynamic characteristics of journal bearings and provides a higher load capacity. Besides, it was found that the other bearing characteristics are considerably affected by the applied magnetic field.
Yahya Sheikhnejad; S A Gandjalikhan Nassab. Three-dimensional numerical analysis of hydrodynamic characteristics of axial groove journal bearings running with ferrofluids under magnetic field. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 2010, 224, 609 -619.
AMA StyleYahya Sheikhnejad, S A Gandjalikhan Nassab. Three-dimensional numerical analysis of hydrodynamic characteristics of axial groove journal bearings running with ferrofluids under magnetic field. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology. 2010; 224 (7):609-619.
Chicago/Turabian StyleYahya Sheikhnejad; S A Gandjalikhan Nassab. 2010. "Three-dimensional numerical analysis of hydrodynamic characteristics of axial groove journal bearings running with ferrofluids under magnetic field." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 224, no. 7: 609-619.