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Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)

ISSN: 2688-7231 (Online)

CFD SIMULATION OF FLUID FLOW AND HEAT TRANSFER THROUGH ALUMINUM METAL FOAM HEAT EXCHANGER

Banjara Kotresha
National Institute of Technology Karnataka Surathkal, Mangalore-575025

N. Gnanasekaran
Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal 575025, India

DOI: 10.1615/IHMTC-2017.2130
pages 1537-1544

Abstract

This paper discusses about the numerical simulations of a heat exchanger system, which is partially filled with metal foams, carried out using commercial software. Metal foams in heat exchangers are very popular among researchers as they have the capability to enhance the efficiency of the heat exchanger in thermal applications. At the bottom of the heat exchanger, a metal foam layer is attached to absorb heat from the exhaust air leaving the system. Aluminum metal foams with 10, 20, 30 and 45 Pores Per Inch (PPI) are considered for heat transfer enhancement. The simulations are carried out for high porosity aluminium metal foams whose porosities vary from 0.90 to 0.95. The heat exchanger system is simulated over a range of 6-30 m/s fluid velocity and the Reynolds number varies from 5000-26000. The temperature distribution of the metal foams is obtained by considering the local thermal equilibrium (LTE) and local thermal non-equilibrium (LTNE) models. It has been observed that the velocity decreases as PPI increases at the expense of its pressure drop in the metal foam region. The LTE and LTNE thermal models have also been compared.

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