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本文研究了冷壁面温度对疏水表面(θ=108.8°)上单个水滴冻结过程的影响,比较了水滴的冻结时间及冻结前后的形态变化。结果表明,水滴冻结所需要的时间随冷表面温度的降低而减小,冷表面温度越低,水滴冻结后其顶端越容易出现树枝状霜晶生长。最后,根据能量守恒原理建立了冷表面上水滴冻结的数学模型,给出了相应的表达式,进而分析了壁面温度对水滴冻结时长的影响,计算结果与实验结果一致。
In this paper, the effect of cold wall temperature on the freezing process of a single water drop on a hydrophobic surface (θ = 108.8 °) was investigated. The freezing time of water droplets and the morphological changes before and after freezing were compared. The results show that the time required for water droplet freezing decreases with the decrease of cold surface temperature. The lower the cold surface temperature is, the more dendritic frost growth appears at the top of water droplet. Finally, according to the principle of conservation of energy, the mathematical model of water drop freezing on cold surface is established, and the corresponding expression is given. The influence of wall temperature on the freezing time of water droplet is also analyzed. The calculation results agree well with the experimental results.