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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Comparison between the Thermal Performance of Single and Two-Layer Microchannels Inserted with Micro Pin Fins

Get access (open in a dialog) DOI: 10.1615/IHTC15.hex.009149
pages 3541-3552

Sinopsis

This paper presents a three-dimensional numerical study of steady, laminar, incompressible flow and forced convection heat transfer through single and double-layer rectangular stacked microchannel heat sink inserted with pin fins. The objective of the study was to optimise the geometric configuration of the combined single and double-layer stack of microchannel heat sink with micro pin fins for a fixed solid volume so that the peak temperature within the configuration is minimised. The geometric optimisation of the microchannel was carried out using a computational fluid dynamic (CFD) code with a goal driven optimization workbench tool subject to global constraints. Effects of pressure drop on the channel hydraulic diameter, channel aspect ratio, solid volume fraction, minimised peak temperature and maximum thermal conductance for the fixed solid volume were reported. The thermal performance of the single and stacked microchannel heat sink inserted with micro pin fins based on the minimised peak temperature and maximised global thermal conductance were compared and their results were reported.For a constant solid volume of 0.9mm3 and fixed length of 10mm, it was observed that while the performance of the single microchannel was improved with the micro pin fins, it was not the case with the double-layer stack. These results showed that inserting pin fins in a stacked microchannel does not enhance the heat transfer when the length of the solid substrate is fixed. The thermal performance of the combined design when the axial length of the solid substrate was relaxed was also reported.