Flow Boiling Instabilities in Microchannels and Means for Mitigation by Reentrant Cavities
Flow Boiling Instabilities in Microchannels and Means for Mitigation by Reentrant Cavities
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DOI：
10.1115/1.2908431
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发表时间：
2008-07
影响因子：
--
通讯作者：
C. Kuo;Y. Peles
中科院分区：
文献类型：
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作者：
C. Kuo;Y. Peles
实验研究了凹腔对微通道内流动沸腾振荡和不稳定性的抑制能力。抑制机制，提出并讨论了各种不稳定模式先前确定的微通道。有人发现，在通道壁内形成的结构化表面可以帮助减轻气泡快速生长的不稳定性，这主导了许多利用微通道中的流动沸腾的系统。这反过来又延迟了平行通道不稳定性和临界热通量（CHF）条件。实验采用了3种200 × 253 μ m2平行微通道器件：凹腔面、连通凹腔面和平面。为了研究和识别流动沸腾不稳定性，获得并比较了核沸腾的起始、CHF条件和局部温度测量。
The ability of reentrant cavities to suppress flow boiling oscillations and instabilities in microchannels was experimentally studied. Suppression mechanisms were proposed and discussed with respect to various instability modes previously identified in microchannels. It was found that structured surfaces formed inside channel walls can assist mitigating the rapid bubble growth instability, which dominates many systems utilizing flow boiling in microchannels. This, in turn, delayed the parallel channel instability and the critical heat flux (CHF) condition. Experiments were conducted using three types of 200 X253 μm 2 parallel microchannel devices: with reentrant cavity surface, with interconnected reentrant cavity surface, and with plain surface. The onset of nucleate boiling, CHF condition, and local temperature measurements were obtained and compared in order to study and identify flow boiling instability.