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research-article

Investigation of Mixed Convection Heat Transfer through Metal Foams Partially Filled in a Vertical Channel by Using CFD

[+] Author and Article Information
Banjara Kotresha

Research scholar, Dept. of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal- 575025, India
bkotresha@gmail.com

N Gnanasekaran

Assistant Professor, Dept. of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal- 575025, India
gnanasekaran@nitk.edu.in

1Corresponding author.

ASME doi:10.1115/1.4040614 History: Received February 06, 2018; Revised June 05, 2018

Abstract

Two dimensional CFD simulations of mixed convection heat transfer through aluminum metal foams partially filled in a vertical channel are carried out numerically. The objective of the present study is to quantify the effect of metal foam thickness on the fluid flow characteristics and the thermal performance in a partially filled vertical channel with metal foams for a fluid velocity range of 0.05 - 3 m/s. The numerical computations are performed for metal foam filled with 40%, 70% and 100% by volume in the vertical channel for four different PPIs of 10, 20, 30 and 45 with porosity values varying from 0.90 to 0.95. To envisage the characteristics of fluid flow and heat transfer, two different models namely Darcy Extended Forchheirmer and Local thermal non-equilibrium have been incorporated for the metal foam region. The numerical results are compared with experimental and analytical results available in the literature for the purpose of validation. The results of the parametric studies on vertical channel show that the Nusselt number increases with the increase of partial filling of metal foams. The thermal performance of the metal foams is reported in terms of Colburn j and performance factors.

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