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Forced Convection Heat Transfer In A Porous Channel Subjected To Oscillating Flow

Liwen Jin
Published 2006 · Materials Science

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The open-cell metal foam is a porous medium which possesses a true metal skeletal structure. The fully inter-connected pore and ligament structures provide the extreme large fluid-to-solid contact surface area and tortuous coolant flow path inside the metal foam, which could increase dramatically the overall heat transfer rate. The high specific surface area, low density and open-celled nature of a metal foam possesses a combination of properties ideally suited for applications in high heat flux thermal management where conventional materials and products are not adequate. In this research, forced convection in a heated channel filled with open-cell metal foam subjected to oscillating flow has been investigated experimentally and numerically. Aluminium metal foams with different pore densities of 10, 20 and 40 PPI (pores per linear inch) were used as the inserted materials along with air as the fluid phase. The temperature distribution on the substrate surface of the heated wall, velocity of oscillating flow through porous channel and pressure drop across the test section were measured. For oscillating flow, pressure drop and flow velocity increase with the increase of kinetic Reynolds number and dimensionless flow amplitude. The results showed that the hydraulic ligament diameter based kinetic Reynolds number and dimensionless flow amplitude are the critical parameters for the investigation of oscillating flow characteristics in open-cell metal foam. The cycle-averaged temperatures were found to decrease with an increase in the kinetic Reynolds number while the cycle-averaged local empirical equation obtained by Nusselt numbers exhibit the opposite trend. The the experimental study showed that the lengthI ATTENTION: The Singapore Copyright Act applies to the use of this document. Nanyang Technological University Library
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