Heat Transfer and Flow Pattern Characteristics for HFE-7100 Within Microchannel Heat Sinks

Autor:	Yeau-Ren Jeng, Kai-Shing Yang, Chi-Chuan Wang, Chun Min Huang
Rok vydání:	2011
Předmět:	Fluid Flow and Transfer Processes Materials science Convective heat transfer Critical heat flux Mechanical Engineering Thermodynamics Heat transfer coefficient Mechanics Heat sink Condensed Matter Physics Heat flux Heat transfer Micro heat exchanger Nucleate boiling
Zdroj:	Heat Transfer Engineering. 32:697-704
ISSN:	1521-0537 0145-7632
DOI:	10.1080/01457632.2010.509774
Popis:	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 μm. 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 occu...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2efcd7984150353d64c62c86aa410ee2 https://doi.org/10.1080/01457632.2010.509774 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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