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首页> 外文期刊>International Journal of Heat and Mass Transfer >Subcooled Flow Boiling And Microbubble Emission Boiling Phenomena In A Partially Heated Microchannel
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Subcooled Flow Boiling And Microbubble Emission Boiling Phenomena In A Partially Heated Microchannel

机译：部分加热的微通道中的过冷流动沸腾和微气泡排放沸腾现象

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摘要

A simultaneous visualization and measurement study has been carried out to investigate subcooled flow boiling and microbubble emission boiling (MEB) phenomena of deionized water in a partially heated Pyrex glass microchannel, having a hydraulic diameter of 155 urn, which was integrated with a Platinum microheater. Effects of mass flux, inlet water subcooling and surface condition of the microheater on subcooled flow boiling in microchannels are investigated. It is found that MEB occurred at high inlet subcoo-lings and at high heat fluxes, where vapor bubbles collapsed into microbubbles after contacting with the surrounding highly subcooled liquid. In the fully-developed MEB regime where the entire microheater was covered by MEB, the mass flux, the inlet water subcooling and the heater surface condition have only small effects on the boiling curves. The occurrence of MEB in microchannel can remove a large amount of heat flux, as high as 14.41 MW/m~2 at a mass flux of 883.8 kg/m~2 s, with only a moderate rise in wall temperature. Therefore, MEB is a very promising method for cooling of microelectronic chips. Heat transfer in the fully-developed MEB in the microchannel is presented, which is compared with existing subcooled flow boiling heat transfer correlations for macrochannels.
机译：同时进行了可视化和测量研究，以研究水力直径为155 um的部分加热的派热克斯玻璃微通道中的去离子水的过冷沸腾沸腾和微气泡排放沸腾（MEB）现象，该通道与铂金微型加热器集成在一起。研究了质量流量，进水过冷和微加热器的表面状况对微通道中过冷沸腾的影响。已经发现MEB发生在高入口子冷却器和高热通量下，在那里蒸汽气泡与周围的高度过冷的液体接触后崩塌成微气泡。在完全开发的MEB方案中，整个微型加热器都被MEB覆盖，质量通量，进水过冷和加热器表面条件对沸腾曲线的影响很小。微通道中MEB的出现可以去除大量的热通量，在质量通量为883.8 kg / m〜2 s时高达14.41 MW / m〜2，壁温只有适度的升高。因此，MEB是一种非常有前途的微电子芯片冷却方法。介绍了微通道中完全开发的MEB中的传热，并将其与现有的大通道过冷流沸腾传热相关性进行了比较。

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