铜基疏水冷表面液滴冻结实验研究

Experimental Study on the Droplet Freezing on Cold Copper-Based Hydrophobic Surfaces

为了研究不同环境条件下液滴在不同接触角疏水表面的冻结行为,采用自组装法制备了具有不同接触角的铜基疏水表面,通过实验观测了不同环境条件下液滴在不同接触角表面的冻结行为,分析了各因素如接触角、冷表面温度、环境温度以及湿度对冻结时间的影响。实验结果表明:在降温过程中,由于疏水表面润湿性发生变化导致接触角减小;冻结时间随接触角、冷表面温度、环境温度及湿度的增加均呈现增加的趋势。结合液滴冻结开始后的相变过程及能量守恒原理,建立了液滴冻结一维层式数学模型,对不同实验条件下液滴的冻结持续时间进行计算,计算结果与实验结果吻合良好,误差不超过15%。

To study the freezing behaviors of droplets on different hydrophobic surfaces in various environmental conditions,the copper-based hydrophobic surfaces with different contact angles were prepared by self-assembly method,and the freezing behaviors of droplets were observed experimentally. The influences of various factors such as contact angle, cold surface temperature,ambient temperature and humidity on the freezing time were analyzed.Experimental results showed that the contact angle was reduced due to the change of wettability in the cooling process.The freezing time increased with the contact angles,cold surface temperature,ambient temperature and humidity.Based on the phase change process and energy conservation principle in the freezing progress,a one-dimensional mathematical model of the droplet was established to calculate the freezing duration of the droplet in different experimental conditions.Comparison showed that the calculated results were in good agreement with the experimental data,with a maximum difference less than 15%.