Characteristics of Single Droplet Impact on Cold Plate Surfaces
Characteristics of Single Droplet Impact on Cold Plate Surfaces
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DOI：
10.1080/07373937.2012.708001
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发表时间：
2012-11
影响因子：
3.3
通讯作者：
Q. Xu;Zhanyong Li;Jin Wang;Ruifang Wang
中科院分区：
文献类型：
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作者：
Q. Xu;Zhanyong Li;Jin Wang;Ruifang Wang
液滴与冷固体表面的碰撞是在低温过程中观察到的基本现象。在这项工作中，一个单一的液滴撞击在冷表面上进行了研究，通过分析的变化，液滴的形状和尺寸记录与高速摄像机。在较低的表面温度（−5°C和−10°C）下，液滴在撞击后会在很短的时间内扩散，然后缩回，但直径要大于室温下的直径，这取决于表面材料的性质和纹理。较高的冲击速度扩大了扩展直径并在一定程度上促进了回缩，但在较低的表面温度下（即，-20 °C）时，液滴迅速冻结，在不锈钢表面上的直径变化比在特氟龙板上的小。研究了液滴撞击30°斜面后的形状变化。不锈钢板抛光后的表面纹理对液滴尺寸回缩有明显的影响。适当选择壁材料和工艺条件可以减轻或防止壁沉积。
Droplet collision with cold solid surfaces is a fundamental phenomenon observed in low-temperature processes. In this work, a single droplet impacting on a cold surface was investigated by analyzing changes in droplet shape and dimensions recorded with a high-speed camera. At low surface temperatures (−5°C and −10°C), the droplet spreads in a very short period upon impact and then retracts, but to a diameter larger than that at room temperature, dependent on surface material property and texture. Higher impact velocity expands the spreading diameter and promotes the retraction to an extent, but at lower surface temperature (i.e., −20°C) the droplet is quickly frozen with smaller change in diameter on the stainless-steel surface rather than on the Teflon plate. The change of droplet shape upon impacting on a 30° inclined surface was also studied. The surface texture of the stainless-steel plate produced by the polishing process has an obvious effect on the droplet dimension retraction. A proper selection of wall material and process conditions can alleviate or prevent wall deposition.