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research-article

Heat transfer investigation of a tube partially wrapped by metal porous layer as a potential novel air cooled heat exchanger tubes

[+] Author and Article Information
Maryam Mohammadpour-Ghadikolaie

Department of Mechanical Engineering, Energy and Control Center of Excellence, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
m_mohammadpour@aut.ac.ir

Majid Saffar Avval

Department of Mechanical Engineering, Energy and Control Center of Excellence, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
mavval@aut.ac.ir

Zohreh Mansoori

Energy Research Center, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
z.mansoori@aut.ac.ir

negar Alvandifar

Department of Mechanical Engineering, Energy and Control Center of Excellence, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
n.alvandifar@aut.ac.ir

Nahid Rahmati

Department of Mechanical Engineering, Energy and Control Center of Excellence, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran
nahid-rahmati@aut.ac.ir

1Corresponding author.

ASME doi:10.1115/1.4041795 History: Received December 08, 2016; Revised September 05, 2018

Abstract

Laminar forced convection heat transfer from a constant temperature tube wrapped fully or partially by a metal porous layer is studied numerically; the heated tube is subjected to a uniform air cross-flow. The main aim of the present study is to introduce some innovative arrangements in which only certain parts of the tube is covered by the metal foam and to investigate the thermal performance of them. The combination of Navier-Stokes and Darcy-Brinkman-Forchheimer equations is applied to evaluate the flow field, governing equations are solved using finite volume SIMPLEC algorithm and the effects of the key parameters such as Reynolds number, thermo physical properties of metal foam and porous layer thickness on Nusselt number are investigated. The results show that using a tube which is fully wrapped by an external porous media with high thermal conductivity, high Darcy number and low drag coefficient, will provide a high heat transfer rate in the high Reynolds number laminar flow, it can increase the Nusselt number almost as high as 16 times compared to a bare tube. The most important result of the present study is that by using some proposed arrangements consist of partially wrapped tubes and changing the position of metal foam layers, higher Nusselt number can be achieved and the heat transfer rate can be increased at least 20 percent in comparison to the fully wrapped one while the weight and material usage can be reduced considerably.

Copyright (c) 2018 by ASME
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