Heat transfer and flow pattern characteristics for HFE-7100 within microchannel heat sinks

Kai Shing Yang, Yeau Ren Jeng, Chun Min Huang, Chi Chuan Wang

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

This study investigates the heat transfer characteristics and flow pattern for the dielectric fluid HFE-7100 within multiport microchannel heat sinks with hydraulic diameters of 480 μm and 790 μm. The test results indicate that the heat transfer coefficient for the smaller channel is generally higher than that of the larger channel. It is found that the heat transfer coefficients are roughly independent of heat flux and vapor quality for a modest mass flux ranging from 200 to 400 kg m-2 s-1 at a channel size of 480 μm and there is a noticeable increase of heat transfer coefficient with heat flux for hydraulic diameters of 790 m. The difference arises from flow pattern. However, for a smaller mass flux of 100 kg m-2 s -1, the presence of flow reversal at an elevated heat flux for hydraulic diameters of 480 μm led to an appreciable drop of heat transfer coefficient. For a larger channel size of 790 μm, though the flow reversal is not observed at a larger heat flux, some local early partial dryout still occurs to offset the heat flux contribution and results in an unconceivable influence of heat flux. The measured heat transfer coefficients for hydraulic diameters of 790 μm are well predicted by the Cooper correlation. However, the Cooper correlation considerably underpredicts the test data by 35-85% for hydraulic diameters of 480 m. The influence of mass flux on the heat transfer coefficient is quite small for both channels.

原文English
頁(從 - 到)697-704
頁數8
期刊Heat Transfer Engineering
32
發行號7-8
DOIs
出版狀態Published - 2011 六月 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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