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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

MICRO-PIV ANALYSIS OF LAMINAR FLOW AND BOILING HEAT TRANSFER CHARACTERISTICS IN MICRO PIN-FIN HEAT SINKS

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.023840
pages 1423-1430

Résumé

Due to the enhanced heat removal performance, micro pin fin heat sinks have a broad applicability in high heat flux devices in microelectronic cooling, aerospace, micro reactors and micro turbine cooling. In this study, the experimental research of laminar flow of Reynolds number from 100 to 450 in circular micro pin-fin heat sink was conducted using micro-PIV system. Then, the boiling heat transfer characteristics of deionized water in the three types of staggered micro pin fins with different cross-section shapes, i.e., diamond, ellipse and circular, were investigated under conditions of the mass flux range from 96 to 224 kg·m-2s-1, heat flux range from 10 to 200 w·cm-2. The results of micro-PIV analysis show that the stagnant recirculation zones and vortex formation are observed behind the pin fins by increasing the Reynolds number. The heat transfer experimental results show that the heat transfer coefficient decreases with the outlet quality. The circular micro pin-fin heat sinks presented the best heat transfer enhancement, followed by diamond and ellipse ones. The experimental results of fluid flow behaviors measured with the micro-PIV can reasonably illustrate the heat transfer characteristics in these heat sinks. Reasonable analysis and explanation of the fluid flow and heat transfer mechanisms in the three micro pin-fin heat sinks are given.