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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >A systematic experimental study on the evaporation rate of supercooled water droplets at subzero temperatures and varying relative humidity
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A systematic experimental study on the evaporation rate of supercooled water droplets at subzero temperatures and varying relative humidity

机译：分零温度和不同相对湿度过冷水滴蒸发速率的系统实验研究

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Supercooled water droplets (SWD) are present in clouds at high altitude and subjected to very low temperatures and high relative humidity. These droplets exist in a metastable state. The understanding of the evaporation of SWD at these extreme conditions is of high interest to understand rain, snow, and hail generating mechanisms in clouds. This paper focuses on the experimental results of the measurements of the evaporation rates beta of supercooled water droplets. For this purpose, single SWDs are trapped by means of optical levitation. During the evaporation process, the elastically scattered light in the forward regime is recorded and evaluated. Experiments have been performed for different relative humidities phi at three constant ambient temperatures, namely, T-infinity = 268.15; 263.15; 253.15 K (t(infinity) = -5; -10; -20 degrees C). The experimental data agrees well with direct numerical simulations (DNS) carried out with the in-house code Free Surface 3D (FS3D) and shows that the use of a simplified model is permissible for these ambient conditions.
机译：过冷水滴（SWD）在高海拔云中存在，并经受非常低的温度和高相对湿度。这些液滴存在于亚稳态状态。了解在这些极端条件下对SWD的蒸发有高兴的兴趣，可以了解云中的雨，雪和冰雹产生机制。本文重点介绍了过冷水滴的蒸发速率β的测量结果。为此目的，单个SWDS通过光学悬浮捕获。在蒸发过程中，记录和评估前向环境中的弹性散射光。在三个恒定的环境温度下对不同的相对湿度PHI进行了实验，即T-Infinity = 268.15; 263.15; 253.15 k（t（无限）= -5; -10; -20℃）。实验数据与内部代码无面积3D（FS3D）进行的直接数值模拟（DNS）吻合良好，并表明这些环境条件允许使用简化模型。

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