Dr. Radhe Shyam is an accomplished academic and researcher in the field of Computational Fluid Dynamics (CFD), currently serving as an Assistant Professor (Grade I) in the Department of Chemical Engineering at NIT Hamirpur. He holds a Ph.D. from IIT Kanpur with a specialization in CFD, preceded by an M.Tech from IIT Roorkee and a B.Tech from IIT Bombay, reflecting a strong academic lineage from premier institutions in India.
Dr. Shyam’s primary research interests include non-Newtonian fluid dynamics, bluff body flows, nanofluids, multiphase flows, and magnetohydrodynamics, particularly in the context of transport phenomena and heat transfer. His research is both experimental and computational, with a focus on enhancing heat transfer performance in engineering systems involving complex fluids and geometries. He has successfully completed a DST-SERB-funded research project and has published extensively in peer-reviewed journals including International Journal of Heat and Mass Transfer a
RESEARCH, TEACHING, or OTHER INTERESTS
Multidisciplinary, Engineering, Chemical Engineering, Fluid Flow and Transfer Processes
10
Scopus Publications
200
Scholar Citations
6
Scholar h-index
6
Scholar i10-index
Scopus Publications
CFD study of heat transfer in power-law fluids over multiple corrugated circular cylinders in a heat exchanger Sonam Gopaldasji Rajpuriya, Radhe Shyam Heat Transfer, 2024 The heat transfer in power‐law fluids across three corrugated circular cylinders placed in a triangular pitch arrangement is studied computationally in a confined channel. Continuity, momentum, and energy balance equations were solved using ANSYS FLUENT (Version 18.0). The flow is assumed to be steady, incompressible, two‐dimensional, and laminar. A square domain of side 300Dh is selected after a detailed domain study. An optimized grid with 98,187 cells is used in the study. The convergence criteria of 10−7 for the continuity, x‐momentum, and y‐momentum balances and 10−12 for the energy equation were used. Constant density and non‐Newtonian power‐law viscosity modules were used. The diffusive term is discretized using a central difference scheme. Convective terms are discretized using the Second‐Order Upwind scheme. Pressure–velocity coupling between continuity and momentum equations was implemented using the semi‐implicit method for pressure‐linked equation scheme. Streamlines show wake development behind the cylinders, which is very dominant at large ReN and n. Isotherm contours are cramped at higher values of ReN and PrN, implying higher heat transfer. Global parameters, like, Cd and Nu, are computed for the wide ranges of controlling dimensionless parameters, such as power‐law index (0.3 ≤ n ≤ 1.5), Reynolds (0.1 ≤ ReN ≤ 40), and Prandtl (0.72 ≤ PrN ≤ 500) numbers. The NuLocal plot attains a pitch near the corrugation of the surface due to abrupt changes in velocity and temperature gradients. Nu increases with ReN and/or PrN and decreases with n under ot herwise identical situations. Nu is correlated with pertinent parameters, namely, ReN, PrN, and n.
CFD study of heat transfer in power-law fluids over a corrugated cylinder Sonam Gopaldasji Rajpuriya, Sachin Kumar Dhiman, Radhe Shyam Heat Transfer, 2024 The computational study of power‐law fluid flow, along with heat transfer attributes over a corrugated heated cylinder, is explored using ANSYS FLUENT (Version 18.0). Fluids power‐law indices fall in the range of 0.25 ≤ n ≤ 1.5, and the Reynolds number spans in the range of 1 ≤ ReN ≤ 40. The flow is two‐dimensional, steady, and laminar. A wide range of Prandtl numbers (0.7 ≤ PrN ≤ 500) is used to cover the most industrially applied fluids. A domain height of 135Dh is used. A grid with the smallest element size of 0.04 m and 135,914 nodes was used. Flow and heat transfer attributes were studied using streamlines, isotherms, and local and average Nusselt numbers. The average Nusselt number increases with ReN and/or PrN. The heat transfer rate is significantly lower in dilatant fluids and higher in pseudoplastic fluids than in Newtonian fluids. The onset of wake formation behind the cylinder takes place at ReN = 10. The increase in Reynolds number (ReN) and power‐law index (n) causes an increase in wake size. Heat transfer increases with the Reynolds number and/or decrease in the power‐law index. The enhancement in heat transfer due to corrugation is studied in detail in terms of average Nusselt number, which has not been studied for arched corrugated cylinder, even for Newtonian fluids in low Reynolds number range. A Nusselt number correlation is also developed for the given ranges of conditions.
Effect of Prandtl number on free convection in power law fluids between two concentric square ducts at low Rayleigh number Radhe Shyam Aip Conference Proceedings, 2022 Natural convection in an annulus between two concentric square ducts is studied numerically for wide ranges of power-law index (0.2 ≤ n ≤ 1.5), Prandtl (0.7 ≤ Pr ≤ 100) and Rayleigh (103 ≤ Ra ≤ 106) numbers. The thermo-physical properties of the fluid such as power-law constants (m, n), specific heat capacity (Cp) and thermal conductivity (k) are assumed to be constant excluding the density, which is calculated using Bousinessq approximation given as, ρ=ρ0[1+β(T0−T)]. Computational mesh is generated using ANSYS WORKBENCH and CFD solver ANSYS FLUENT is used for computation. Flow behaviour is predicted using streamlines, whereas, heat transfer characteristics are delineated by isotherms, local(NuLocal) and average(NuAvg) Nusselt numbers with respect to power-law index(n), Prandtl (Pr) and Rayleigh (Ra) numbers. Convection and hence heat transfer increases with Rayleigh number (Ra). Heat transfer rate decreases with Prandtl number in shear-thinning fluids, shows insignificant change in Newtonian fluids and increases in shear-thinning fluids.
Numerical study on flow of non-Newtonian power law fluids acrossan arched roughened circular cylinder Sachin Kumar Dhiman, Dr. Radhe Shyam Aip Conference Proceedings, 2020 Numerical analysis to investigate the flow characteristics of non-Newtonian power-law fluids across a roughened circular cylinder has been done using ANSYS Fluent 18.0. The Reynolds number (Re)and power-law index (n) of the flow vary in the range of 1 ≤ Re ≤ 40 and 0.25 ≤ n ≤ 1.5 respectively. The flow characteristics have been analyzed in terms of pressure (Cdp), friction (Cdf) and total drag coefficients (Cd) withRe and n as variable parameters. The detailed flow visualization has been done with the help of streamlines and vorticity contours. All else being similar Cdp and Cdf decrease with Re. The Cd for dilatant fluid is less than the Newtonian fluid for Reynolds number up to 10, whereas, for Re > 10, the Cd for Newtonian fluid is less than the dilatant fluid, under otherwise identical situations. Cd on the roughened circular cylinder is significantly higher than the simple circular cylinder.
Low Reynolds number flow of power-law fluids over two square cylinders in tandem Radhe Shyam, Rajendra Prasad Chhabra Korean Journal of Chemical Engineering, 2014 The governing partial differential equations have been solved numerically for the 2-D and steady powerlaw fluid flow over two square cylinders in tandem arrangement. Extensive numerical results spanning wide ranges of the governing parameters as Reynolds number (0.1≤Re≤40), power-law index (0.2≤n≤1) and inter-cylinder spacing (2≤L/d≤6) are presented herein; limited results for L/d=24 are also obtained to approach the single cylinder behavior. The detailed flow visualization is done by means of the streamline and vorticity contours in the vicinity of two cylinders. The global characteristics are analyzed in terms of the surface pressure distribution and pressure drag coefficient. The drag coefficient shows the classical inverse dependence on the Reynolds number irrespective of the value of the powerlaw index; the drag on the upstream cylinder is always greater than that for the downstream cylinder.
Natural convection heat transfer from two vertically aligned circular cylinders in power-law fluids Radhe Shyam, C. Sasmal, R.P. Chhabra International Journal of Heat and Mass Transfer, 2013 In this work, laminar natural convection in power-law liquids from a pair of vertically aligned heated cylinders has been studied numerically over the following ranges of conditions: Prandtl number ( 0.72 ⩽ Pr ⩽ 10 2 ), Grashof number ( 10 ⩽ Gr ⩽ 10 4 ), power-law index ( 0.3 ⩽ n ⩽ 1.5 ) thereby embracing both shear-thinning and shear-thickening fluid behaviour and the center-to-center gap between the two cylinders was varied over the range ( 2 ⩽ ( S / D ) ⩽ 20 ). The heat transfer characteristics of the lower cylinder are little influenced by the presence of the upper heated cylinder in line with the previous studies. On the other hand, the average Nusselt number for the upper cylinder could be higher or lower than that of the lower cylinder depending upon the value of (S/D), Grashof number and power-law index. Overall, all else being equal, shear-thinning behaviour can enhance heat transfer by up to 100% whereas shear-thickening has adverse influence on the rate of heat transfer. The present results on Nusselt number and drag coefficient have been correlated using simple analytical forms which permit the estimation of these parameters for the two cylinders in a new application with acceptable levels of accuracy. In addition to the overall heat transfer characteristics, the detailed structure of the velocity and temperature fields is visualised in terms of the streamline and isotherm contours over the preceding ranges of parameters.
Natural convection in power-law fluids from two square cylinders in tandem arrangement at moderate Grashof numbers Radhe Shyam, R. P. Chhabra Heat and Mass Transfer Waerme Und Stoffuebertragung, 2013 In this work, free convective flow and heat transfer in power-law fluids from two heated square cylinders in tandem arrangement is studied. The governing differential equations have been solved numerically over wide ranges of Grashof number, 10 ≤ Gr ≤ 1,000, Prandtl number, 0.71 ≤ Pr ≤ 50 and power-law index, 0.4 ≤ n ≤ 1.8. In order to elucidate the extent of inter-cylinder interaction, the non-dimensional inter-cylinder spacing, L/d is varied in the range, 2 ≤ L/d ≤ 6. The results are interpreted in terms of streamline and isotherm contours in the proximity of two cylinders to gain physical insights into the nature of flow. At the next level, the distribution of the local Nusselt number along the surface of the cylinders is presented. At the minimum inter-cylinder spacing due to the intense interference, the downstream cylinder contributes much less to the overall heat transfer whereas it experiences much higher hydrodynamic drag than the upstream cylinder. Broadly, the local and average Nusselt number for both cylinders show a positive dependence on both Grashof and Prandtl numbers. Also, all else being equal, shear-thinning fluid behaviour promotes the rate of heat transfer and shear-thickening fluid behaviour impedes it. Finally, the present numerical results have been correlated by using simple forms of equations thereby enabling the estimation of Nusselt number in a new application.
Laminar flow of power-law fluids past a hemisphere: Momentum and forced convection heat transfer characteristics C. Sasmal, Radhe Shyam, R.P. Chhabra International Journal of Heat and Mass Transfer, 2013 The governing field equations describing the momentum and heat transfer characteristics of the laminar power-law fluid flow past a hemisphere have been solved numerically. The present results span wide ranges of Reynolds number (1 to 150), power-law index (0.1 to 1) and Prandtl number (0.72 to 100) in order to delineate their influence on the momentum and heat transfer characteristics of a hemisphere oriented with its curved surface towards the oncoming fluid stream. Over the range of Reynolds number, the flow is expected to be steady and axisymmetric. Owing to the sudden loss of rear surface, the flow detaches itself from the hemisphere at much lower Reynolds numbers than that for a sphere. Similarly, the effect of power-law index gradually weakens with the increasing Reynolds number due to the increasing significance of inertial forces. All else being equal, the drag on a hemisphere is increased in shear-thinning fluids than that in Newtonian fluids at low Reynolds numbers and it is the other way round at high Reynolds numbers. Similarly, irrespective of the type of thermal boundary condition prescribed on the surface of the hemisphere, heat transfer is facilitated in shear-thinning fluids with reference to that in Newtonian fluids otherwise under identical conditions.
Effect of Prandtl number on heat transfer from tandem square cylinders immersed in power-law fluids in the low Reynolds number regime Radhe Shyam, R.P. Chhabra International Journal of Heat and Mass Transfer, 2013 In this work, forced convection heat transfer from two square cylinders in tandem arrangement to power-law and Newtonian fluids has been investigated. The governing differential equations (continuity, momentum and energy balance) have been solved numerically. The results reported herein encompass wide ranges of the pertinent dimensionless parameters, namely, Prandtl number, 0.71 ⩽ Pr ⩽ 100, Reynolds number, 0.1 ⩽ Re ⩽ 40, power-law index, 0.2 ⩽ n ⩽ 1 and centre-to-center cylinder spacing, 2 ⩽ L/d ⩽ 6, albeit limited results were also obtained for L/d = 24 to retrieve the limiting case of non-interacting cylinders. The range of the center-to-center gap between the two cylinders is such that it corresponds to strong to virtually no interactions between the two cylinders. Furthermore, the range of Reynolds number is such that the flow is expected to be steady. The detailed heat transfer characteristics are interpreted in terms of the isotherm patterns in the close proximity of each cylinder and the variation of the local Nusselt number on the surface of each cylinder. Finally, the surface averaged values of the Nusselt number are expressed in terms of Reynolds number, power-law index and Prandtl number for center-to-center distances L/d = 2, 4 and 6. These results are also expressed in terms of the usual Colburn j-factor as a function of the Reynolds number and power-law index over the range of conditions spanned here.
Free convection from a heated circular cylinder in confined power-law fluids Radhe Shyam, M. Sairamu, N. Nirmalkar, R.P. Chhabra International Journal of Thermal Sciences, 2013 In this work, free convection heat transfer from a horizontal cylinder (isothermal or dissipating heat at a constant rate) placed on the horizontal axis of a square duct filled with an incompressible power-law fluid has been investigated. On the other hand, along the vertical centre line, three relative positions of the heated cylinder are considered, namely, at the centre, close to the upper wall and close to the bottom wall to elucidate the effect of the symmetric and asymmetric confinement. The governing differential equations, namely, continuity, momentum and energy have been solved numerically to elucidate the effect of the pertinent kinematic (Rayleigh number, Ra; Prandtl number, Pr; power-law index, n ) and geometric parameters, especially the relative positioning of the heated cylinder with reference to the bottom wall. Overall, the present results span the wide range of conditions as 10 2 ≤ Ra ≤ 10 6 ; 0.71 ≤ Pr ≤ 100; 0.2 ≤ n ≤ 1.8 and 0.25 ≤ β 1 ≤ 0.75, and the flow is believed to be laminar and steady over this range of Rayleigh numbers. Overall, the average Nusselt number shows positive dependence on Grashof number and Prandtl number. The overall heat transfer also decreases as the cylinder gradually approaches the upper adiabatic wall. The streamline and isotherm contours reveal interesting flow patterns which show a rather strong dependence on the value of β 1 .
RECENT SCHOLAR PUBLICATIONS
CFD study of heat transfer in power‐law fluids over multiple corrugated circular cylinders in a heat exchanger SG Rajpuriya, R Shyam Heat Transfer 53 (8), 4339-4363 , 2024 2024 Citations: 5
CFD study of heat transfer in power‐law fluids over a corrugated cylinder SG Rajpuriya, SK Dhiman, R Shyam Heat Transfer 53 (7), 3880-3901 , 2024 2024
Heat Transfer Enhancement over Spirally Corrugated Tube placed in Non-Newtonian Multiphase Power-Law Fluids SSR Shyam Proceedings of the Recent Trends in Transport Processes (RTTP-2024), Paper … , 2024 2024
Heat transfer enhancement from three square cylinders triangularly arranged in power-law fluid inside a heat exchanger SGRR Shyam Proceedings of the Recent Trends in Transport Processes (RTTP-2024), Paper … , 2024 2024
CFD Study of Numerical Investigation the Effect of Heat Transfer Enhancement of Laminar Non-Newtonian Nano-Fluid Flow through A Corrugated Channel Using Power-Law Model RSU Gangwar International Conference on Recent Trends in Transport Processes (RTTP-2024 … , 2024 2024
Optimum Production of Biodiesel from Waste Cooking Oil, R Shyam International Conference on Recent Trends in Transport Processes (RTTP-2024 … , 2024 2024
CFD Study of Heat Transfer Enhancement in a Rib-Groove Corrugated Channel Using Nano-Fluids UGR Shyam IIChE-CHEMCON-2023, 27-30 December 2023, Heritge Institute of Technology … , 2023 2023
CFD Study of Power-Law Fluid Flow Over a Square Cylinder With Arched Roughness AKBDRS Himanshu Srivastava, Sonam Gopaldasji Rajpuriya The 5th International Conference on Frontiers in Industrial and Applied … , 2022 2022
Effect of Prandtl number on free convection in power law fluids between two concentric square ducts at low Rayleigh number R Shyam AIP Conference Proceedings 2435 (1), 020035 , 2022 2022 Citations: 1
Flow and Heat Transfer over Multiple Cylinders in Power-Law Fluids ST Radhe Shyam, Prakriti, Rishi Kumar, Mudit Sharma 74th Annual Session of Indian Institute of Chemical Engineers, CHEMCON-2021 … , 2021 2021
Numerical study on flow of non-Newtonian power law fluids acrossan arched roughened circular cylinder SK Dhiman, DR Shyam AIP Conference Proceedings 2253 (1), 020006 , 2020 2020 Citations: 3
CFD Study on Solar Air Heater with Trapezoidal Roughness Inside a Rectangular Duct SKDR Shyam FIAM(Frontiers in Industrial and Applied Mathematics) - 2019 , 2019 2019
A Comparative Study of Forced Convective Heat Transfer over Two Square and Circular Cylinders Placed in Power-Law Fluid R Shyam 6th international and 43rd National Conference on Fluid Mechanics and … , 2017 2017
Removal of Malchite Green Dye Using Egg Shell Powder as Adsorbent VDAK Radhe Shyam, Shubhendra Vasta, Vasu Roy, VikasNegi, ShantanuYadav National Conference on Recent Trends in Chemical Sciences & Engineering … , 2017 2017
Low Reynolds number flow of power-law fluids over two square cylinders in tandem R Shyam, RP Chhabra Korean Journal of Chemical Engineering 31 (11), 1954-1963 , 2014 2014 Citations: 6
Free convection from a heated circular cylinder in confined power-law fluids R Shyam, M Sairamu, N Nirmalkar, RP Chhabra International journal of thermal sciences 74, 156-173 , 2013 2013 Citations: 31
Natural convection heat transfer from two vertically aligned circular cylinders in power-law fluids R Shyam, C Sasmal, RP Chhabra International Journal of Heat and Mass Transfer 64, 1127-1152 , 2013 2013 Citations: 38
Laminar flow of power-law fluids past a hemisphere: Momentum and forced convection heat transfer characteristics C Sasmal, R Shyam, RP Chhabra International Journal of Heat and Mass Transfer 63, 51-64 , 2013 2013 Citations: 18
Natural convection in power-law fluids from two square cylinders in tandem arrangement at moderate Grashof numbers R Shyam, RP Chhabra Heat and Mass Transfer 49 (6), 843-867 , 2013 2013 Citations: 11
Heat transfer in power-law fluids over a trapezoidal cylinder R Shyam International Conference on Advances in Chemical Engineering (ACE 2013 … , 2013 2013
MOST CITED SCHOLAR PUBLICATIONS
Unsteady heat transfer from an equilateral triangular cylinder in the unconfined flow regime A Dhiman, R Shyam International Scholarly Research Notices 2011 (1), 932738 , 2011 2011 Citations: 49
Natural convection heat transfer from two vertically aligned circular cylinders in power-law fluids R Shyam, C Sasmal, RP Chhabra International Journal of Heat and Mass Transfer 64, 1127-1152 , 2013 2013 Citations: 38
Effect of Prandtl number on heat transfer from tandem square cylinders immersed in power-law fluids in the low Reynolds number regime R Shyam, RP Chhabra International Journal of Heat and Mass Transfer 57 (2), 742-755 , 2013 2013 Citations: 38
Free convection from a heated circular cylinder in confined power-law fluids R Shyam, M Sairamu, N Nirmalkar, RP Chhabra International journal of thermal sciences 74, 156-173 , 2013 2013 Citations: 31
Laminar flow of power-law fluids past a hemisphere: Momentum and forced convection heat transfer characteristics C Sasmal, R Shyam, RP Chhabra International Journal of Heat and Mass Transfer 63, 51-64 , 2013 2013 Citations: 18
Natural convection in power-law fluids from two square cylinders in tandem arrangement at moderate Grashof numbers R Shyam, RP Chhabra Heat and Mass Transfer 49 (6), 843-867 , 2013 2013 Citations: 11
Low Reynolds number flow of power-law fluids over two square cylinders in tandem R Shyam, RP Chhabra Korean Journal of Chemical Engineering 31 (11), 1954-1963 , 2014 2014 Citations: 6
CFD study of heat transfer in power‐law fluids over multiple corrugated circular cylinders in a heat exchanger SG Rajpuriya, R Shyam Heat Transfer 53 (8), 4339-4363 , 2024 2024 Citations: 5
Numerical study on flow of non-Newtonian power law fluids acrossan arched roughened circular cylinder SK Dhiman, DR Shyam AIP Conference Proceedings 2253 (1), 020006 , 2020 2020 Citations: 3
Effect of Prandtl number on free convection in power law fluids between two concentric square ducts at low Rayleigh number R Shyam AIP Conference Proceedings 2435 (1), 020035 , 2022 2022 Citations: 1
CFD study of heat transfer in power‐law fluids over a corrugated cylinder SG Rajpuriya, SK Dhiman, R Shyam Heat Transfer 53 (7), 3880-3901 , 2024 2024
Heat Transfer Enhancement over Spirally Corrugated Tube placed in Non-Newtonian Multiphase Power-Law Fluids SSR Shyam Proceedings of the Recent Trends in Transport Processes (RTTP-2024), Paper … , 2024 2024
Heat transfer enhancement from three square cylinders triangularly arranged in power-law fluid inside a heat exchanger SGRR Shyam Proceedings of the Recent Trends in Transport Processes (RTTP-2024), Paper … , 2024 2024
CFD Study of Numerical Investigation the Effect of Heat Transfer Enhancement of Laminar Non-Newtonian Nano-Fluid Flow through A Corrugated Channel Using Power-Law Model RSU Gangwar International Conference on Recent Trends in Transport Processes (RTTP-2024 … , 2024 2024
Optimum Production of Biodiesel from Waste Cooking Oil, R Shyam International Conference on Recent Trends in Transport Processes (RTTP-2024 … , 2024 2024
CFD Study of Heat Transfer Enhancement in a Rib-Groove Corrugated Channel Using Nano-Fluids UGR Shyam IIChE-CHEMCON-2023, 27-30 December 2023, Heritge Institute of Technology … , 2023 2023
CFD Study of Power-Law Fluid Flow Over a Square Cylinder With Arched Roughness AKBDRS Himanshu Srivastava, Sonam Gopaldasji Rajpuriya The 5th International Conference on Frontiers in Industrial and Applied … , 2022 2022
Flow and Heat Transfer over Multiple Cylinders in Power-Law Fluids ST Radhe Shyam, Prakriti, Rishi Kumar, Mudit Sharma 74th Annual Session of Indian Institute of Chemical Engineers, CHEMCON-2021 … , 2021 2021
CFD Study on Solar Air Heater with Trapezoidal Roughness Inside a Rectangular Duct SKDR Shyam FIAM(Frontiers in Industrial and Applied Mathematics) - 2019 , 2019 2019
A Comparative Study of Forced Convective Heat Transfer over Two Square and Circular Cylinders Placed in Power-Law Fluid R Shyam 6th international and 43rd National Conference on Fluid Mechanics and … , 2017 2017
