Forced convection heat dissipation efficacy by controlling concurrent flow rates of water/nanofluid through a mini- and micro-channel stacked double-layer heat sink

  • 林 湘明

Student thesis: Doctoral Thesis

Abstract

SUMMARY This paper aims to investigate the double-layer heat sink formed by stacking a millimeter flow channel heat sink over a single-layer micro-channel heat sink in an experimental measurement manner compared with the original single-layer micro-channel heat sink And adopt the pure water and the 1% volume of alumina-water nanofluid in the single-layer micro-channel and under layer of the double-layer heat sink (the upper layer fixed to the pure water) to compare the effect of fluid on its heat transfer and pressure drop The experimental results show that the addition of a millimeter heat sink above a single-layer micro-channel heat sink can significantly reduce the required pressure drop The highest pressure drop occurs at the highest flow ratio 9 of 499 7 total Reynolds number In this case the pressure drop can be reduced by about 32 times and at the heat transfer performance the highest heat transfer occurs at the flow rate 0 3 of the total Reynolds number of 995 6 which can improve the heat transfer performance by about 11 7% Finally the under layer of the double-layer heat sink is replaced by 1% volume concentration of nanofluid (the upper channel is still pure water) and the experimental results show that only about 1 5% of the heat transfer effect can be improved Key words: double-layer heat sink single-layer heat sink Nanofluids
Date of Award2019
Original languageEnglish
SupervisorChing-Jenq Ho (Supervisor)

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