Evaporation and condensation of flash boiling sprays impinging on a cold surface
Evaporation and condensation of flash boiling sprays impinging on a cold surface
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闪蒸喷雾撞击冷表面时的蒸发和冷凝
DOI：
10.1016/j.fuel.2020.119423
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发表时间：
2020-10
期刊：
影响因子：
7.4
通讯作者：
Min Xu
中科院分区：
文献类型：
--
作者：
Di Xiao;Shuyi Qiu;David Hung;Xuesong Li;Keiya Nishida;Min Xu
闪急沸腾喷雾被认为是一种潜在的解决方案，除了可以改善发动机气缸内的燃料-空气混合外，还可以解决与喷雾撞击相关的问题，如喷雾-壁面相互作用引起的池火。与典型的过冷喷雾撞击相比，闪急沸腾喷雾撞击会受到更复杂的传热和传质过程的影响，包括在很低的温度下燃料蒸汽在壁面附近凝结。这项工作的目的是研究闪蒸喷雾撞击冷表面时壁膜的形成。采用激光诱导激基复合体荧光(LIFE)技术对喷雾撞击过程中的气液两相荧光信号进行了分离。同时测量了透明平板上壁膜的厚度和温度分布，并分析了相应的传热传质过程。与过冷喷雾相比，冷面闪急沸腾喷雾在壁面上沉积的液膜质量一般较少，但仍远大于闪急沸腾喷雾撞击常温平板。研究发现，在闪急沸腾条件下，细小液滴和大量水蒸气共同作用于壁面，形成的液膜较少。随着壁面温度的降低，蒸发抑制和冷凝作用日益明显，主导着壁膜的形成和发展。
Flash boiling spray is considered a potential solution for addressing spray impingement related issues such as pool fire caused by spray-wall interactions, in addition to its benefit of improving fuel-air mixing in engine cylinders. In comparison to typical sub-cooled spray impingement, flash boiling spray impingement can be affected by more complicated heat transfer and the mass transfer processes, including fuel vapor condensation near the wall when the temperature is very low. This work aims to investigate the wall film formation when flash boiling sprays impinge on a cold surface. Laser-induced exciplex fluorescence (LIEF) technique was used in this investigation to separate the fluorescent signals from the liquid phase and the gas phase during spray impingement. The simultaneous measurement of the thickness and temperature distributions of the wall film on a transparent plate were conducted, and corresponding heat and mass transfer of the film were analyzed. Generally, flash boiling impingement on cold surface would deposit less film mass on the wall than sub-cooled sprays, however it was still much larger than flash boiling spray impinging on room temperature plate. It was found that under flash boiling conditions, the combination of fine droplets and a large quantity of vapor impinged on the wall to form much less film. As wall temperature decreased, evaporation suppression and condensation effects became increasingly significant to dominate the wall film formation and development.
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