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首页> 外文期刊>International Journal of Heat and Mass Transfer >Visualization of the subcooled flow boiling of R-134a in a vertical rectangular channel with an electrically heated wall
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Visualization of the subcooled flow boiling of R-134a in a vertical rectangular channel with an electrically heated wall

机译：R-134a在带有电加热壁的垂直矩形通道中过冷流动沸腾的可视化

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摘要

A digital photographic study of subcooled flow boiling with R-1.34a was performed in a vertical rectangular channel heated from one side to observe near-wall structures. Primary attention was given to bubble formation and bubble coalescence in the bubble layer. The visualization made possible a detailed observation of the characteristic near-wall region, consisting of vapor remnants, an interleaved liquid layer, and coalesced adjacent bubbles. In particular, the visualization provided clearer insights about bubble coalescence behaviors during flow nucleate boiling. In addition, it is shown that the near-wall bubble layer of nucleate boiling beneath vapor clots is extinguished and, afterwards, the heated surface is locally covered by large vapor films, at CHF.
机译：在从一侧加热的垂直矩形通道中进行了用R-1.34a进行过冷沸腾沸腾的数字摄影研究，以观察近壁结构。主要关注气泡层中的气泡形成和气泡聚结。可视化使对特征近壁区域的详细观察成为可能，该区域由蒸气残留物，交错的液体层和聚结的相邻气泡组成。特别是，可视化提供了有关流动核沸腾过程中气泡聚结行为的更清晰见解。另外，显示出在蒸汽凝块下方沸腾的核的近壁气泡层被熄灭，然后，被加热的表面在CHF处局部被大的蒸汽膜覆盖。

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