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The influence of inclined magnetic field and heat and mass transfer of a hydromagnetic fluid on stretching/shrinking sheet with Stefan blowing effects and radiation has been investigated. The elementary viscous equations for momentum, heat and mass transfer, which are highly nonlinear partial differential equations, are mapped into highly nonlinear ordinary differential equations with the help of similarity transformation. The subsequent highly nonlinear differential equation is solved analytically. The exact solution of heat and mass transfer appearances is found in terms of the incomplete gamma function. The species and temperature boundary conditions are assumed to be a linear function of the distance from the origin. Further, the impact of various parameters, such as Chandrasekhar number, thermal radiation, inclined Lorentz force and mass transpiration on velocity and temperature summaries, are conferred in detail.
U. S. Mahabaleshwar; T. Anusha; P. H. Sakanaka; Suvanjan Bhattacharyya. Impact of Inclined Lorentz Force and Schmidt Number on Chemically Reactive Newtonian Fluid Flow on a Stretchable Surface When Stefan Blowing and Thermal Radiation are Significant. Arabian Journal for Science and Engineering 2021, 1 -17.
AMA StyleU. S. Mahabaleshwar, T. Anusha, P. H. Sakanaka, Suvanjan Bhattacharyya. Impact of Inclined Lorentz Force and Schmidt Number on Chemically Reactive Newtonian Fluid Flow on a Stretchable Surface When Stefan Blowing and Thermal Radiation are Significant. Arabian Journal for Science and Engineering. 2021; ():1-17.
Chicago/Turabian StyleU. S. Mahabaleshwar; T. Anusha; P. H. Sakanaka; Suvanjan Bhattacharyya. 2021. "Impact of Inclined Lorentz Force and Schmidt Number on Chemically Reactive Newtonian Fluid Flow on a Stretchable Surface When Stefan Blowing and Thermal Radiation are Significant." Arabian Journal for Science and Engineering , no. : 1-17.
In the present study, the heat transfer and thermal performance of a helical corrugation with perforated circular disc solar air-heater tubes are predicted using a machine learning regression technique. This paper describes a statistical analysis of heat transfer by developing an artificial neural network-based machine learning model. The effects of variation in the corrugation angle (θ), perforation ratio (k), corrugation pitch ratio (y), perforated disc pitch ratio (s), and Reynolds number have been analyzed. An artificial neural network model is used for regression analysis to predict the heat transfer in terms of Nusselt number and thermohydraulic efficiency, and the results showed high prediction accuracies. The artificial neural network model is robust and precise, and can be used by thermal system design engineers for predicting output variables. Two different models are trained based on the features of experimental data, which provide an estimation of experimental output based on user-defined input parameters. The models are evaluated to have an accuracy of 97.00% on unknown test data. These models will help the researchers working in heat transfer enhancement-based experiments to understand and predict the output. As a result, the time and cost of the experiments will reduce.
Suvanjan Bhattacharyya; Debraj Sarkar; Rahul Roy; Shramona Chakraborty; Varun Goel; Eydhah Almatrafi. Application of New Artificial Neural Network to Predict Heat Transfer and Thermal Performance of a Solar Air-Heater Tube. Sustainability 2021, 13, 7477 .
AMA StyleSuvanjan Bhattacharyya, Debraj Sarkar, Rahul Roy, Shramona Chakraborty, Varun Goel, Eydhah Almatrafi. Application of New Artificial Neural Network to Predict Heat Transfer and Thermal Performance of a Solar Air-Heater Tube. Sustainability. 2021; 13 (13):7477.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Debraj Sarkar; Rahul Roy; Shramona Chakraborty; Varun Goel; Eydhah Almatrafi. 2021. "Application of New Artificial Neural Network to Predict Heat Transfer and Thermal Performance of a Solar Air-Heater Tube." Sustainability 13, no. 13: 7477.
A solar air heater (SAH) is a heat exchanger that is capable of converting radiations (solar) into thermal energy, which is further utilized for heating purposes. But due to poor thermal conductivity of air, SAH has poor thermal performance. Roughness is one of the effective techniques used to improve the performance of SAH. Two different roughness geometries, semicircular and square, were used in the present article, and the effect of different parameters on the exergy efficiency of a SAH is investigated. The flow passage used for the solar air heater has a triangular cross section with an equal side length of 160 mm. The positive impact of various roughness parameters (relative roughness height, e/D and relative roughness pitch, p/e) and operating parameters (Reynolds number) has been obtained on the exergetic efficiency of the SAH. Comparing both the roughness geometries, it is concluded that the exergetic efficiency found in semicircular ribbed SAH is 26% higher than that of square roughness at e/D and p/e value of 0.04 and 10, respectively. The exergetic efficiency of a SAH is suitable for design as it includes the quality of useful energy and its associated pumping power. The design plots are also developed and based upon that recommendations are made to develop an efficient solar air heater.
Sunil Kumar; Rajneesh Kumar; Varun Goel; Suvanjan Bhattacharyya; Alibek Issakhov. Exergetic performance estimation for roughened triangular duct used in solar air heaters. Journal of Thermal Analysis and Calorimetry 2021, 145, 1661 -1672.
AMA StyleSunil Kumar, Rajneesh Kumar, Varun Goel, Suvanjan Bhattacharyya, Alibek Issakhov. Exergetic performance estimation for roughened triangular duct used in solar air heaters. Journal of Thermal Analysis and Calorimetry. 2021; 145 (3):1661-1672.
Chicago/Turabian StyleSunil Kumar; Rajneesh Kumar; Varun Goel; Suvanjan Bhattacharyya; Alibek Issakhov. 2021. "Exergetic performance estimation for roughened triangular duct used in solar air heaters." Journal of Thermal Analysis and Calorimetry 145, no. 3: 1661-1672.
The working medium is air in a solar air heater (SAH) and because of its low heat-transfer coefficient, SAH results in poor performance. By placing artificial-roughness over the heat-collector plate, the performance of a SAH can be improved significantly. The improvement in thermal and hydraulic performance by providing multiple-arc-rib roughnesses patterns with the gap is discussed and generalized correlations are developed for Nusselt number and friction factor based on results collected from the experimentation (under steady condition). In total seven parameters were considered to study heat transfer and friction characteristics, that is, Reynolds number, rib-pitch, rib-height, number of gaps, arc-attack angle, rib, and gap width. In comparison to smooth collector-plate type of solar air heater, the 5.76 and 6.05 times higher Nusselt number and friction factor obtained in the proposed roughened SAH. Besides this, the developed mathematical expression for Nusselt number and friction factor shows close-fit with the experimental data under the error band of only 10 and 12%, respectively.
Rajneesh Kumar; Varun Goel; Suvanjan Bhattacharyya; V. V. Tyagi; Abdullah M. Abusorrah. Experimental investigation for heat and flow characteristics of solar air heater having symmetrical gaps in multiple-arc rib pattern as roughness elements. Experimental Heat Transfer 2021, 1 -18.
AMA StyleRajneesh Kumar, Varun Goel, Suvanjan Bhattacharyya, V. V. Tyagi, Abdullah M. Abusorrah. Experimental investigation for heat and flow characteristics of solar air heater having symmetrical gaps in multiple-arc rib pattern as roughness elements. Experimental Heat Transfer. 2021; ():1-18.
Chicago/Turabian StyleRajneesh Kumar; Varun Goel; Suvanjan Bhattacharyya; V. V. Tyagi; Abdullah M. Abusorrah. 2021. "Experimental investigation for heat and flow characteristics of solar air heater having symmetrical gaps in multiple-arc rib pattern as roughness elements." Experimental Heat Transfer , no. : 1-18.
The present experimental work is performed to investigate the convection heat transfer (HT), pressure drop (PD), irreversibility, exergy efficiency and thermal performance for turbulent flow inside a uniformly heated circular channel fitted with novel geometry of hybrid tape. Air is taken as the working fluid and the Reynolds number is varied from 10,000 to 80,000. Hybrid tape is made up of a combination of grooved spring tape and wavy tape. The results obtained with the novel hybrid tape show significantly better performance over individual tapes. A correlation has been developed for predicting the friction factor (f) and Nusselt number (Nu) with novel hybrid tape. The results of this investigation can be used in designing heat exchangers. This paper also presented a statistical analysis of the heat transfer and fluid flow by developing an artificial neural network (ANN)-based machine learning (ML) model. The model is trained based on the features of experimental data, which provide an estimation of experimental output based on user-defined input parameters. The model is evaluated to have an accuracy of 98.00% on unknown test data. These models will help the researchers working in heat transfer enhancement-based experiments to understand and predict the output. As a result, the time and cost of the experiments will reduce.
Suvanjan Bhattacharyya; Devendra Vishwakarma; Shramona Chakraborty; Rahul Roy; Alibek Issakhov; Mohsen Sharifpur. Turbulent Flow Heat Transfer through a Circular Tube with Novel Hybrid Grooved Tape Inserts: Thermohydraulic Analysis and Prediction by Applying Machine Learning Model. Sustainability 2021, 13, 3068 .
AMA StyleSuvanjan Bhattacharyya, Devendra Vishwakarma, Shramona Chakraborty, Rahul Roy, Alibek Issakhov, Mohsen Sharifpur. Turbulent Flow Heat Transfer through a Circular Tube with Novel Hybrid Grooved Tape Inserts: Thermohydraulic Analysis and Prediction by Applying Machine Learning Model. Sustainability. 2021; 13 (6):3068.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Devendra Vishwakarma; Shramona Chakraborty; Rahul Roy; Alibek Issakhov; Mohsen Sharifpur. 2021. "Turbulent Flow Heat Transfer through a Circular Tube with Novel Hybrid Grooved Tape Inserts: Thermohydraulic Analysis and Prediction by Applying Machine Learning Model." Sustainability 13, no. 6: 3068.
A circular tube fitted with novel corrugated spring tape inserts has been investigated. Air was used as the working fluid. A thorough literature review has been done and this geometry has not been studied previously, neither experimentally nor theoretically. A novel experimental investigation of this enhanced geometry can, therefore, be treated as a new substantial contribution in the open literature. Three different spring ratio and depth ratio has been used in this study. Increase in thermal energy transport coefficient is noticed with increase in depth ratio. Corrugated spring tape shows promising results towards heat transfer enhancement. This geometry performs significantly better (60% to 75% increase in heat duty at constant pumping power and 20% to 31% reduction in pumping power at constant heat duty) than simple spring tape. This paper also presented a statistical analysis of the heat transfer and fluid flow by developing an artificial neural network (ANN)-based machine learning (ML) model. The model is evaluated to have an accuracy of 98.00% on unknown test data. These models will help the researchers working in heat transfer enhancement-based experiments to understand and predict the output. As a result, the time and cost of the experiments will reduce. The results of this investigation can be used in designing heat exchangers.
Basma Souayeh; Suvanjan Bhattacharyya; Najib Hdhiri; Mir Waqas Alam. Heat and Fluid Flow Analysis and ANN-Based Prediction of A Novel Spring Corrugated Tape. Sustainability 2021, 13, 3023 .
AMA StyleBasma Souayeh, Suvanjan Bhattacharyya, Najib Hdhiri, Mir Waqas Alam. Heat and Fluid Flow Analysis and ANN-Based Prediction of A Novel Spring Corrugated Tape. Sustainability. 2021; 13 (6):3023.
Chicago/Turabian StyleBasma Souayeh; Suvanjan Bhattacharyya; Najib Hdhiri; Mir Waqas Alam. 2021. "Heat and Fluid Flow Analysis and ANN-Based Prediction of A Novel Spring Corrugated Tape." Sustainability 13, no. 6: 3023.
Parallelization of inhouse develpoed code for numerical computations on heterogeneous computing machine is becoming common. As the numerical solvers and problem complexity are evolving, the parallel computing facilities are also growing. This research study deals with the use of four different schemes to parallelly compute the numerical flow equations based on the finite volume method. The different schemes proposed are applied for parallelization using central processing units and graphical processing units. Open multiprocessing (OpenMP) and compute unified device architecture (CUDA) are the parallel computing tools used for parallelization of the code applying four schemes, viz. red and black successive over-relaxation (RBSOR), wavefront, combined RBSOR and wavefront, and alternate RBSOR and wavefront scheme. The flow analysis is carried out for internal and external flow at different Reynolds numbers on dissimilar machines having their individual computational capability. Speedup obtained and parallel efficiency achieved using the proposed unusual parallelization method are investigated separately. The grid size for both the flow conditions is fixed during the parallel computation performance analysis. The RBSOR scheme provided the maximum speedup in all cases of flow, scheme, and tool used. The wavefront scheme provides the lowest speedup and parallel efficiency. The alternate scheme is better than the wavefront scheme and combined scheme using OpenMP. The speedup achieved and parallel efficiency obtained for the CUDA parallelized code are in the range of 200 × and 70%, respectively, applying the RBSOR scheme.
Asif Afzal; C. Ahamed Saleel; K. Prashantha; Suvanjan Bhattacharyya; Mohammed Sadhikh. Parallel finite volume method-based fluid flow computations using OpenMP and CUDA applying different schemes. Journal of Thermal Analysis and Calorimetry 2021, 145, 1891 -1909.
AMA StyleAsif Afzal, C. Ahamed Saleel, K. Prashantha, Suvanjan Bhattacharyya, Mohammed Sadhikh. Parallel finite volume method-based fluid flow computations using OpenMP and CUDA applying different schemes. Journal of Thermal Analysis and Calorimetry. 2021; 145 (4):1891-1909.
Chicago/Turabian StyleAsif Afzal; C. Ahamed Saleel; K. Prashantha; Suvanjan Bhattacharyya; Mohammed Sadhikh. 2021. "Parallel finite volume method-based fluid flow computations using OpenMP and CUDA applying different schemes." Journal of Thermal Analysis and Calorimetry 145, no. 4: 1891-1909.
In the present work, an effort has been made to present the short review of all the numerical as well as experimental studies done in the field of heat transfer and pressure drop in the transitional flow regime. The experimental and numerical studies on transition flow are reported. Though, there are several challenges to do experiments in transition flow regime. Various techniques are also discussed and summarized. Results show that the techniques prove outstanding performance, but few methods quiet suffer from high pressure drop. As per discussion, new viewpoints on the current research gaps and future research ways have been providing for the development of heat transfer techniques.
Suvanjan Bhattacharyya; Devendra Kumar Vishwakarma; Manoj Kumar Soni. Heat Transfer and Pressure Drop in Transitional Flow: A Short Review. IOP Conference Series: Materials Science and Engineering 2021, 1080, 012050 .
AMA StyleSuvanjan Bhattacharyya, Devendra Kumar Vishwakarma, Manoj Kumar Soni. Heat Transfer and Pressure Drop in Transitional Flow: A Short Review. IOP Conference Series: Materials Science and Engineering. 2021; 1080 (1):012050.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Devendra Kumar Vishwakarma; Manoj Kumar Soni. 2021. "Heat Transfer and Pressure Drop in Transitional Flow: A Short Review." IOP Conference Series: Materials Science and Engineering 1080, no. 1: 012050.
Using an air handling unit (AHU) is a suitable method to meet the ventilation requirements in a conditioned space. This paper proposes two novel design configurations of AHUs, which ensure that the excess load on the AHU cooling coil is minimized using air to air heat recovery units, a desiccant based rotary dehumidifier, and an evaporative cooler. The proposed design is also capable of harvesting surplus water in the process. The impact assessment of the proposed designs is illustrated taking the example of a typical high-humidity design case. Simplified mathematical models were used to analyze the power-saving and moisture harvesting potential of the two configurations. Calculations show that both the configurations reduce the excess load on the cooling coil by a significant amount, while also co-producing surplus water for domestic use.
Vyom Chaturvedi; Devendra Kumar Vishwakarma; Suvanjan Bhattacharyya. Design of Solar Powered Desiccant based Air Handling Unit. IOP Conference Series: Materials Science and Engineering 2021, 1080, 012038 .
AMA StyleVyom Chaturvedi, Devendra Kumar Vishwakarma, Suvanjan Bhattacharyya. Design of Solar Powered Desiccant based Air Handling Unit. IOP Conference Series: Materials Science and Engineering. 2021; 1080 (1):012038.
Chicago/Turabian StyleVyom Chaturvedi; Devendra Kumar Vishwakarma; Suvanjan Bhattacharyya. 2021. "Design of Solar Powered Desiccant based Air Handling Unit." IOP Conference Series: Materials Science and Engineering 1080, no. 1: 012038.
The fundamentals of heat transfer and its applications, the classification of heat transfer technology and different heat transfer techniques, and the needs for augmentation and its benefits and the different combinations of two or more inserts and integral roughness elements for heat transfer augmentation purpose have been introduced and discussed in this chapter. It is shown that most of the compound techniques performed better than the individual inserts for heat transfer enhancement. This chapter has also been dedicated to understanding the basic concepts of vortex generators for heat transfer enhancement in plate-fin heat exchangers. The performance of transverse, longitudinal, and wing-type vortex generators has been discussed as well.
Suvanjan Bhattacharyya; Devendra K. Vishwakarma; Sanghati Roy; Ranjib Biswas; Mohammad Moghimi Ardekani. Applications of Heat Transfer Enhancement Techniques: A State-of-the-Art Review. Inverse Heat Conduction and Heat Exchangers 2020, 1 .
AMA StyleSuvanjan Bhattacharyya, Devendra K. Vishwakarma, Sanghati Roy, Ranjib Biswas, Mohammad Moghimi Ardekani. Applications of Heat Transfer Enhancement Techniques: A State-of-the-Art Review. Inverse Heat Conduction and Heat Exchangers. 2020; ():1.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Devendra K. Vishwakarma; Sanghati Roy; Ranjib Biswas; Mohammad Moghimi Ardekani. 2020. "Applications of Heat Transfer Enhancement Techniques: A State-of-the-Art Review." Inverse Heat Conduction and Heat Exchangers , no. : 1.
The COVID-19 is a severe respiratory disease caused by a devastating coronavirus family (2019-nCoV) has become a pandemic across the globe. It is an infectious virus and transmits by inhalation or contact with droplet nuclei produced during sneezing, coughing, and speaking by infected people. Airborne transmission of COVID-19 is also possible in a confined place in the immediate environment of the infected person. Present study investigates the effectiveness of conditioned air released from air-conditioning machines to mix with aerosol sanitizer to reach every point of the space of the isolation room so as to kill the COVID-19 virus which will help to protect the lives of doctors, nurses and health care workers. In order to numerically model the laminar-transitional flows, transition SST k-ε model, which involves four transport equations are employed in the current study. It is found from the analysis that high turbulent fields generated inside the isolation room may be an effective way of distributing sanitizer in entire volume of isolation room to kill the COVID-19 virus.
Suvanjan Bhattacharyya; Kunal Dey; Akshoy Ranjan Paul; Ranjib Biswas. A novel CFD analysis to minimize the spread of COVID-19 virus in hospital isolation room. Chaos, Solitons & Fractals 2020, 139, 110294 -110294.
AMA StyleSuvanjan Bhattacharyya, Kunal Dey, Akshoy Ranjan Paul, Ranjib Biswas. A novel CFD analysis to minimize the spread of COVID-19 virus in hospital isolation room. Chaos, Solitons & Fractals. 2020; 139 ():110294-110294.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Kunal Dey; Akshoy Ranjan Paul; Ranjib Biswas. 2020. "A novel CFD analysis to minimize the spread of COVID-19 virus in hospital isolation room." Chaos, Solitons & Fractals 139, no. : 110294-110294.
The effects of perforated circular disc swirl generator on heat transfer (HT) and flow fields in a solar air heater helical corrugated tube have been investigated experimentally. Thermal energy transport coefficient at different values of the corrugation angle (θ), the corrugation pitch ratio (y), the perforation ratio (k), and the perforation disc pitch ratio (s) is studied for Reynolds numbers (Re) ranging from 10,000 to 52,000. Isothermal pressure drop tests and heat transfer experiments under a uniform heat flux conditions have been carried out. The results indicate that in the presence of a perforated circular disc inside the helically corrugated tube, heat transfer is augmented by around 50–60%. Entropy generation in the form of irreversibility is reported. Exergy analysis, in terms of exergy efficiency, is presented. The corrugated tube with swirl generator inserts augments the thermal energy transport coefficient mostly, which is accompanied by a minimum pressure penalty. The combined geometry augments more thermal energy transport coefficient than those of acting alone. A predictive Nusselt number and friction factor correlation are also developed. A large data set has been created for thermal energy transport coefficient and thermal–hydraulic performance, which is beneficial for the design of solar thermal air heaters and heat exchangers.
Suvanjan Bhattacharyya; Manabendra Pathak; Mohsen Sharifpur; Sunil Chamoli; Daniel R. E. Ewim. Heat transfer and exergy analysis of solar air heater tube with helical corrugation and perforated circular disc inserts. Journal of thermal analysis 2020, 145, 1019 -1034.
AMA StyleSuvanjan Bhattacharyya, Manabendra Pathak, Mohsen Sharifpur, Sunil Chamoli, Daniel R. E. Ewim. Heat transfer and exergy analysis of solar air heater tube with helical corrugation and perforated circular disc inserts. Journal of thermal analysis. 2020; 145 (3):1019-1034.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Manabendra Pathak; Mohsen Sharifpur; Sunil Chamoli; Daniel R. E. Ewim. 2020. "Heat transfer and exergy analysis of solar air heater tube with helical corrugation and perforated circular disc inserts." Journal of thermal analysis 145, no. 3: 1019-1034.
This paper presents the numerical analysis of the transient performance of the latent heat thermal energy storage unit established on finite difference method. The storage unit consists of a shell and tube arrangement with phase change material (PCM) filled in the shell space and the heat transfer fluid (HTF) flowing in the inner tube. The heat exchange between the HTF, wall and PCM has been investigated by developing a 2-D fully implicit numerical model for the storage module and solving the complete module as a conjugate problem using enthalpy transforming method. A comparative investigation of the total melting time of the PCM has been performed based on natural convection in liquid PCM during the charging process. The novelty of this paper lies in the fact it includes convection in PCM and this investigation includes a detailed parametric study which can be used as a reference to design latent heat storage. The results indicate that natural convection accelerates the melting process by a significant amount of time. In order to optimize the design of the thermal storage unit, parametric study has been accompanied to analyze the influence of various HTF working conditions and geometric dimensions on the total melting time of the PCM. Another important feature considered in this work is the influence of the inner wall of the tube carrying the HTF on the entire melting time of the PCM. An error of around 7.2% is reported when inner wall of the tube is ignored in the analysis.
Manoj Kumar Soni; Nisha Tamar; Suvanjan Bhattacharyya. Numerical simulation and parametric analysis of latent heat thermal energy storage system. Journal of thermal analysis 2020, 141, 1 -16.
AMA StyleManoj Kumar Soni, Nisha Tamar, Suvanjan Bhattacharyya. Numerical simulation and parametric analysis of latent heat thermal energy storage system. Journal of thermal analysis. 2020; 141 (6):1-16.
Chicago/Turabian StyleManoj Kumar Soni; Nisha Tamar; Suvanjan Bhattacharyya. 2020. "Numerical simulation and parametric analysis of latent heat thermal energy storage system." Journal of thermal analysis 141, no. 6: 1-16.
In the present study, a numerical simulation is carried out to analyze the effect of turbulent intensity on the flow behavior of flow past two dimensional bluff bodies. Triangular prism, diamond and trapezoidal shaped bodies with the same hydraulic diameter D, a dimensionless length scale are taken into consideration as bluff bodies. The objective of the numerical analysis is to cover cross flow at both turbulent and laminar regime with varying Reynolds number upto 200,000 and inlet intensities ranging between 5% and 40%. The flow medium used is air at a constant Prandtl number. The energy, momentum and continuity equations are dealt with transition SST Model for closure of turbulence. The results obtained through numerical simulation are validated with other published results by researchers and show good agreements. This present study reveals that transition SST Model can be efficiently used to cover both laminar and turbulent flow regimes to estimate the heat transfer. The impact of inlet turbulent intensity on augmentation of heat transfer using bluff bodies has been evaluated. It is observed from the study that the turbulent intensity significantly affects drag coefficient.
Sudhir Chandra Murmu; Suvanjan Bhattacharyya; Himadri Chattopadhyay; Ranjib Biswas. Analysis of heat transfer around bluff bodies with variable inlet turbulent intensity: A numerical simulation. International Communications in Heat and Mass Transfer 2020, 117, 104779 .
AMA StyleSudhir Chandra Murmu, Suvanjan Bhattacharyya, Himadri Chattopadhyay, Ranjib Biswas. Analysis of heat transfer around bluff bodies with variable inlet turbulent intensity: A numerical simulation. International Communications in Heat and Mass Transfer. 2020; 117 ():104779.
Chicago/Turabian StyleSudhir Chandra Murmu; Suvanjan Bhattacharyya; Himadri Chattopadhyay; Ranjib Biswas. 2020. "Analysis of heat transfer around bluff bodies with variable inlet turbulent intensity: A numerical simulation." International Communications in Heat and Mass Transfer 117, no. : 104779.
In the present work, heat transfer and pressure drop characteristics in flow through a tube with inline and staggered baffles having angular cut at the edge are reported for various operating conditions. An experimental test rig is designed and developed to investigate heat transfer and pressure drop behavior for different conditions. Effects of different geometrical parameters, i.e., pitch ratios, baffle arrangement and cutting angle of baffles on heat transfer rate and pressure drop characteristics, have been investigated for turbulent flow regime. Reynolds number ranging from 10,000 to 52,000 has been considered in the present study. The maximum heat transfer rate has been observed for staggered arrangement with pitch ratio of 0.1 and cutting angle of 60°, while minimum heat transfer rate has been observed for inline arrangement with pitch ratio of 0.2 and cutting angle of 30°. Empirical correlations for Nusselt number and friction factor have been developed as a function of geometrical and flow parameters. The deviations between experimental and predicted values of Nusselt number and friction factor for staggered arrangements have been observed as ± 10%, ± 4%, respectively, whereas for inline arrangement the deviation has been observed as ± 12%, ± 5%, respectively. Results from empirical correlations are well agreed with the experimental data.
Suvanjan Bhattacharyya; Ali Cemal Benim; Manabendra Pathak; Sunil Chamoli; Ashutosh Gupta. Thermohydraulic characteristics of inline and staggered angular cut baffle inserts in the turbulent flow regime. Journal of thermal analysis 2019, 140, 1519 -1536.
AMA StyleSuvanjan Bhattacharyya, Ali Cemal Benim, Manabendra Pathak, Sunil Chamoli, Ashutosh Gupta. Thermohydraulic characteristics of inline and staggered angular cut baffle inserts in the turbulent flow regime. Journal of thermal analysis. 2019; 140 (3):1519-1536.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Ali Cemal Benim; Manabendra Pathak; Sunil Chamoli; Ashutosh Gupta. 2019. "Thermohydraulic characteristics of inline and staggered angular cut baffle inserts in the turbulent flow regime." Journal of thermal analysis 140, no. 3: 1519-1536.
Flows around bluff cylinder have received the attention of many researchers over the years. Therefore, the purpose of this paper was to study the effect of turbulence intensity on the transport phenomena over modified diamond cylinders which is investigated in this work. The bluff cylinders considered are of diamond shape and extruded diamond shape. The hydraulic diameter of bluff bodies is taken as the non-dimensional length scale. The simulation is done to cover cross-flow covering the laminar and turbulent regime with the Reynolds number reaching up to 10,000, while the inlet turbulent intensity is varied between 5 and 20%. The influence of turbulent intensity on enhancing heat transfer from the body has been emphasized in this work. The transition SST models along with governing equations (continuity, momentum, and energy equations) are solved numerically with ANSYS Fluent 19.2. The simulation results are validated with established correlations, and excellent agreement is found. This work demonstrates that the transition SST model can effortlessly bridge all flow regimes for predicting the heat transfer. The study computes the influence of inlet turbulence intensity on augmenting heat transfer from the bluff cylinders. The pressure and drag coefficients are found to be unaffected by the inlet turbulent intensity.
Suvanjan Bhattacharyya; Himadri Chattopadhyay; Ranjib Biswas; Daniel R. E. Ewim; Z. Huan. Influence of Inlet Turbulence Intensity on Transport Phenomenon of Modified Diamond Cylinder: A Numerical Study. Arabian Journal for Science and Engineering 2019, 45, 1051 -1058.
AMA StyleSuvanjan Bhattacharyya, Himadri Chattopadhyay, Ranjib Biswas, Daniel R. E. Ewim, Z. Huan. Influence of Inlet Turbulence Intensity on Transport Phenomenon of Modified Diamond Cylinder: A Numerical Study. Arabian Journal for Science and Engineering. 2019; 45 (2):1051-1058.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Himadri Chattopadhyay; Ranjib Biswas; Daniel R. E. Ewim; Z. Huan. 2019. "Influence of Inlet Turbulence Intensity on Transport Phenomenon of Modified Diamond Cylinder: A Numerical Study." Arabian Journal for Science and Engineering 45, no. 2: 1051-1058.
The effects of short length (SL) and full length (FL) swirl generators on heat transfer and flow fields in a solar air heater tube have been investigated experimentally. Thermal energy transport coefficient performance for different values of the spring ratio, twist ratio, tape thickness ratio and diameter ratio (DR) was studied for Reynolds numbers (Re) ranging between 6000 and 20,000. The tube with swirl generator inserts augments the thermal energy transport coefficient mostly, which is accompanied by a larger pressure penalty. The twisted and spring tape (FL) leads to larger thermal energy transport coefficient than spring and twisted tape (SL). It was found that by using spring and twisted tape (FL) at constant pumping power, heat duty increases up to 22% and 27% in comparison with spring and twisted tape (SL), respectively. Similarly, by using spring and twisted tape (FL) at constant heat duty, pumping power rises up to 27% and 33% in comparison with spring and twisted tape (SL), respectively. A large database has been generated for the thermal energy transport coefficient and thermal–hydraulic performance which is beneficial for the design of solar thermal heaters and heat exchangers.
Suvanjan Bhattacharyya. The effects of short length and full length swirl generators on heat transfer and flow fields in a solar air heater tube. Journal of thermal analysis 2019, 140, 1355 -1369.
AMA StyleSuvanjan Bhattacharyya. The effects of short length and full length swirl generators on heat transfer and flow fields in a solar air heater tube. Journal of thermal analysis. 2019; 140 (3):1355-1369.
Chicago/Turabian StyleSuvanjan Bhattacharyya. 2019. "The effects of short length and full length swirl generators on heat transfer and flow fields in a solar air heater tube." Journal of thermal analysis 140, no. 3: 1355-1369.
Suvanjan Bhattacharyya; Sujoy Kumar Saha. Thermohydraulics of laminar flow through a circular tube having integral helical rib roughness and fitted with centre-cleared twisted-tape. Experimental Thermal and Fluid Science 2012, 42, 154 -162.
AMA StyleSuvanjan Bhattacharyya, Sujoy Kumar Saha. Thermohydraulics of laminar flow through a circular tube having integral helical rib roughness and fitted with centre-cleared twisted-tape. Experimental Thermal and Fluid Science. 2012; 42 ():154-162.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Sujoy Kumar Saha. 2012. "Thermohydraulics of laminar flow through a circular tube having integral helical rib roughness and fitted with centre-cleared twisted-tape." Experimental Thermal and Fluid Science 42, no. : 154-162.