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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

A NUMERICAL AND EXPERIMENTAL STUDY OF OPTIMAL DISTRIBUTION OF DISCRETE HEAT SOURCE ARRAY COOLED BY NATURAL AND FORCED CONVECTION

DOI: 10.1615/TFESC1.hte.012696
pages 1185-1199

Shankar O. Durgam
Department of Mechanical Engineering, IIT Madras, Chennai-600036, India

G. Ramanjaneyulu
Department of Mechanical Engineering, IIT Madras, Chennai-600036, India

S. P. Venkateshan
Heat Transfer and Thermal Power Laboratory, Indian Institute of Technology Madras, Chennai 600036 India

Thirumalachari Sundararajan
Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India 600036


KEY WORDS: Natural and forced convection, Conjugate heat transfer, Discrete heat sources, Optimal configuration, Thermal management

Abstract

This paper deals with the optimal configuration of seven rectangular heat sources of different sizes that mimic ICs used in electronic components. The heat sources that are made of aluminum with different sizes are mounted on a bakelite substrate board. The effect of forced and natural convection conjugate heat transfer for different heat fluxes and flow velocities has been investigated experimentally. It is found that in forced convection the excess temperature at v = 0.27 m/s are 26.24,35.67 and 43.1°C and that for v = 0.45 m/s are 25.5,33.02 and 42.34°C for the heat flux values of 1500,2000,2500 W/m2 respectively.In case of natural convection for heat flux values of 750,1000 and 1250 W/m2 the excess temperatures are 26.53,35.8 and 43.58°C respectively. The problem is also modeled and simulated using Comsol Multiphysics software. The experimental and numerical results of excess temperatures are in good agreement in both natural and forced convection conjugate heat transfer under laminar flow conditions. Experiments support the existence of an optimum arrangement.

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