Enhancement of Heat Transfer in a 3-D Square Duct with Porous Inserts
P. Parthasarathy, V. Ratna Kishore, Prabal Talukdara and Anjan Ray
Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi 110 016, India.
aprabal@mech.iitd.ac.in
ABSTRACT
In recent years, porous insert has been used in duct for enhancing heat transfer in high temperature thermal equipment, where both convective and radiative heat transfer play a major role. In the present work, study of heat transfer enhancement is carried out for flow through a square duct with a porous insert. The hydrodynamically developing flow field is solved using the Navier-Stokes equation and Darcy- Brinkman model is considered for solving the flow in the porous region. The radiative heat transfer is included in the analysis by coupling the radiative transfer equation to the energy equation. The fluid considered is CO2 with temperature dependent thermo-physical properties. Both the fluid and the porous medium are considered as gray participating medium. The increase in heat transfer is analyzed by comparing the bulk mean temperature, Nusselt number and radiative heat flux for different porous size and orientation, Reyonlds number and Darcy number.
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