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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Effect of ultrasound on frost formation on a cold flat surface in atmospheric air flow
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Effect of ultrasound on frost formation on a cold flat surface in atmospheric air flow

机译：超声波对大气气流中寒冷平坦表面上结霜的影响

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摘要

An experimental study concerning frost formation on a cold flat surface in atmospheric air flow subjected to the effect of 20. kHz ultrasound was conducted. A close observation of the frost nucleation and frost growth processes with and without the effect of 20. kHz ultrasound was made with a microscopic image system. The size and distribution of freezing water droplets during the initial nucleation period were described and the frost layer structure and thickness variation with time were presented. It was found that the freezing water droplets formed on the surface with the effect of ultrasound are smaller and sparser compared with those without the effect of ultrasound. The coverage of freezing droplets is all less than 52% with the effect of ultrasound compared with that all more than 65% without ultrasound under some tested conditions. Furthermore, the frost layer structure with a special pattern like " frost line" is observed on the cold surface and very small growth of the frost layer can be seen with the effect of ultrasound. The rate of frost layer thickness reduction with the effect of ultrasound compared with that without ultrasound is about 75%. The experimental results also showed that the frost formation process on the flat surface is remarkably restrained due to the effect of ultrasound.
机译：进行了关于在20 kHz超声作用下大气气流中的冷平坦表面上结霜的实验研究。使用显微镜图像系统对有无20 kHz超声的霜成核和霜生长过程进行了密切观察。描述了成核初期冻结水滴的大小和分布，并给出了霜层的结构和厚度随时间的变化。发现与没有超声作用的那些相比，在超声作用下在表面上形成的冷冻水滴更小且稀疏。在某些测试条件下，超声波作用下的冷冻液滴覆盖率均小于52％，而超声波作用下的覆盖率均大于65％。此外，在寒冷的表面上观察到具有“霜线”等特殊图案的霜层结构，并且在超声波的作用下可以看到霜层的很小的生长。超声作用下的霜层厚度减小率与无超声作用下的相比减小了约75％。实验结果还表明，由于超声波的作用，在平坦表面上的结霜过程受到了明显的抑制。

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