Geometric mean of fin efficiency and effectiveness: A parameter to determine optimum length of open-cell metal foam used as extended heat transfer surface

[+] Author and Article Information
Tisha Dixit

Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur - 721 302, India

Indranil Ghosh

Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur - 721 302, India

1Corresponding author.

ASME doi:10.1115/1.4036079 History: Received May 03, 2016; Revised January 09, 2017


High porosity open-cell metal foams have captured the interest of thermal industry due to their high surface area density, low weight and ability of creating tortuous mixing of fluid. In this work, application of metal foams as heat sinks has been explored. The foam has been represented as a simple-cubic structure and heat transfer from a heated base has been treated analogous to that of solid fins. Based on this model, three performance parameters namely, foam efficiency, overall foam efficiency and foam effectiveness have been evaluated for metal foam heat sinks. Parametric studies with varying foam length, porosity, pore density, material and fluid velocity has been conducted. It has been observed that geometric mean of foam efficiency and foam effectiveness can be a useful parameter to exactly determine the optimum foam length. Additionally, the variation in temperature profile of different foams heated from one end has been determined experimentally by cooling these with atmospheric air. Experimental results for four metal foam samples with porosity in the range of 0.908 - 0.964, pore density of 10 and 20 PPI and made of copper, aluminium and Fe-Ni-Cr alloy have been presented.

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