Stabilization of Flow Boiling in Microchannels Using Pressure Drop Elements and Fabricated Nucleation Sites
Stabilization of Flow Boiling in Microchannels Using Pressure Drop Elements and Fabricated Nucleation Sites
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DOI：
10.1115/1.2165208
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发表时间：
2006-04
影响因子：
--
通讯作者：
S. Kandlikar;Wai Keat Kuan;Daniel A. Willistein;J. Borrelli
中科院分区：
文献类型：
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作者：
S. Kandlikar;Wai Keat Kuan;Daniel A. Willistein;J. Borrelli
流动沸腾过程具有严重的不稳定性，这是由于在小通道或微通道的过热液体环境中蒸汽气泡的成核而引起的。为了提高流动沸腾的稳定性，提出了一些改进措施，并在1054197 m平行矩形微通道（水力直径332 m）上以水为工质进行了实验。分析了成核开始时的空腔尺寸和局部液体和壁面条件。评价了进口限压器和制造成核点作为稳定流动沸腾过程和避免回流现象的手段的效果。结果与光滑通道中不受限制的流动形态进行了比较。DOI: 10.1115/1.2165208
The flow boiling process suffers from severe instabilities induced due to nucleation of vapor bubbles in a superheated liquid environment in a minichannel or a microchannel. In an effort to improve the flow boiling stability, several modifications are introduced and experiments are performed on 1054197 m parallel rectangular microchannels (hydraulic diameter of 332 m) with water as the working fluid. The cavity sizes and local liquid and wall conditions required at the onset of nucleation are analyzed. The effects of an inlet pressure restrictor and fabricated nucleation sites are evaluated as a means of stabilizing the flow boiling process and avoiding the backflow phenomenon. The results are compared with the unrestricted flow configurations in smooth channels. DOI: 10.1115/1.2165208