Conference Papers
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Item Prediction of heat transfer with discrete heat sources in a vertical channel filled  ith high porosity metal foam(Dalian University of Technology, 2018) Kotresha, B.; Gnanasekaran, N.This paper discusses about the numerical prediction of isothermal condition with discrete heat sources in a vertical channel filled with high porosity metal foams. The problem considered consists of a vertical channel in which discrete heat source assembly is placed at the centre and high porosity metal foams are placed on either side of the aluminium plates to enhance the heat transfer. The flow through the metal foam porous medium is predicted by using Darcy Extended Forchheimer model and Local thermal non-equilibrium model as well as local thermal equilibrium model is used for heat transfer prediction. The results are presented in terms of temperature excess over the ambient for both empty and metal foam filled channel. Finally, the heat input through the discrete heat sources is varied to obtain an isothermal condition on all the heat sources at a constant inlet velocity. © 2018 by the authors of the abstracts.Item Forced Convection Analysis in a Horizontal Pipe in the Presence of Aluminium Metal Foam—A Numerical Study(Springer Science and Business Media Deutschland GmbH, 2021) Jadhav, P.H.; Kotresha, B.; Gnanasekaran, N.; Arumuga Perumal, D.Numerical exploration of forced convective heat transfer through the aluminium metallic foam filled in a horizontal pipe is done expending a commercially existing software ANSYS FLUENT 15.0. The motive of the ongoing numerical examination is to investigate the effect of fully filled metal foam in a horizontal pipe for different flow regimes. 10 PPI metal foam having 0.85 porosity is filled 60% along the length of pipe in the flow direction. The Darcy-extended Forchheimer (DEF) flow and local thermal non-equilibrium (LTNE) models are considered at the metal foam region to envisage fluid flow and augment in heat transfer. The numerical methodology is validated by comparing the results with available experimental data. The results of pressure loss, variation of wall temperature and Nusselt number are reported and discussed. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Thermodynamic analysis of entropy generation in a horizontal pipe filled with high porosity metal foams(Elsevier Ltd, 2022) Jadhav, P.H.; Gnanasekaran, N.; Arumuga Perumal, D.A.In the field of thermal management of electronic equipment, examining entropy generation properties is extremely useful. The entropy production experiments have been expanded to porous media using high porosity metal foams. The entropy production/generation for forced convection heat transfer in a tube is quantified via a numerical research. In the field of air stream direction, the horizontal pipe is entirely filled with nickel metal foam of 0.6 m length. For the isotropic porous metal foam zone, the Darcy-extended Forchheimer (DEF) flow is used to capture the dynamics of flow and local thermal non-equilibrium (LTNE) model is used for analyzing the heat transport phenomenon, while the k-e turbulent model is used for the non-foam porous region of the tube. The effect of fully filled nickel metallic foam with different pore densities of 10, 20, and 30 metal foam with a porosity of 0.85 is being investigated. The computational solutions presented here are supported by experimental results published in the literature. The outlet exergy of the system rises with higher flow rates and falls with higher metal foam pore densities. The results of entropy generation due to thermal and fluid friction and Bejan number conceptions are also shown and discussed. © 2022 Elsevier Ltd.Item Fluid Flow Analysis in a Partially Filled Horizontal Channel with a Metal Foam Block—A Numerical Study(Springer Science and Business Media Deutschland GmbH, 2024) Aditya, N.; Gnanasekaran, N.; Yadav, A.K.This numerical study investigated fluid flow behaviour in a horizontal channel partially filled with a metal foam block with various foam lengths. The effect of inlet velocities from 6.5 to 12.5 m/s and different pore densities from 5 to 30 PPI is analyzed. Results show that the location of eddy formation, the magnitude of pressure drop, and friction factor vary with the inlet velocity, foam length, and pore density. Pressure gradient increased with inlet velocity, PPI, and lflf,max, with the highest value of approximately 1190 Pa/m for the case of 30 PPI, 12.5 m/s, and lflf,max = 1. The friction factor increased with PPI, lflf,max and decreased with inlet velocity with a maximum value of 4.2 for the case of 30 PPI, 6.5 m/s, and lflf,max = 1. Low inlet velocity and high PPI result in more deviation of fluid flow from the bulk flow direction, upstream of the block. There is a tendency for early variation of fluid flow for more extended foam blocks. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Performance Evaluation of Single Pass Solar Air Heater with Stepped-Type Arrangement of Metal Foam by a Numerical Study(Springer Science and Business Media Deutschland GmbH, 2024) Diganjit, R.; Gnanasekaran, N.A solar air heater is easy to build and easy to use for drying applications, room heating purposes, etc. In the present study, single-pass forced convection rectangular-type solar air heater is studied numerically. The copper metal foam with 0.92 porosity is used for case (a) empty channel, cases (b) to (e) comprising of different stepped-type arrangements, and case (f) fully filled metal foam condition and studied numerically to obtain outlet temperature, pressure drop and the performance factor of the solar air heater. The Reynolds number is varied from 4401 to 5868. Based on this range of Reynolds number RNG k-ε model with enhanced wall function is adopted for numerical simulations. The local thermal equilibrium model is used to simulate the porous zone. The Rosseland radiation model has been chosen with solar ray tracing method. The case (c) is the best stepped-type arrangement to get same outlet temperature compared to fully filled metal foam case (f). Hence, the material cost is minimized. The temperature rise is 8.89% more compared to empty channel solar air heater. Case (c) has less pressure drop compared to other metal foam arrangements. The performance factor for case (c) is 2.03. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.