| 过冷水滴碰撞结冰的实验与模拟研究 |
| |
| 引用本文： | 张旋,刘鑫,吴晓敏,闵敬春. 过冷水滴碰撞结冰的实验与模拟研究[J]. 工程热物理学报, 2020, 0(2): 402-410 |
| |
| 作者姓名： | 张旋 刘鑫 吴晓敏 闵敬春 |
| |
| 作者单位： | 清华大学能源与动力工程系热科学与动力工程教育部重点实验室;清华大学航天航空学院工程力学系热科学与动力工程教育部重点实验室 |
| |
| 基金项目： | 吴仲华奖励基金资助项目;博士后国际交流计划派出项目(No.20190005) |
| |
| 摘 要： | 以宏观结冰/霜过程中过冷水滴的碰撞结冰现象为背景,实验对比了亲水和超疏水表面上常温水滴碰撞、常温水滴碰撞结冰和过冷水滴碰撞结冰的过程,建立了过冷水滴碰撞结冰过程的数值模型,研究了We数和接触角对碰撞结冰的影响。结果表明:相比于常温水滴的碰撞及其碰撞结冰过程,过冷水滴碰撞结冰过程的稳态铺展系数更大;随着过冷度和We数的增大以及接触角的减小,过冷水滴的碰撞结冰与常温水滴的碰撞在水滴形态和铺展系数上的差异逐渐增大。
|
| 关 键 词： | 过冷水滴 成核再辉 碰撞 结冰 |
Experimental and Modeling Research on the Impact and Freezing of a Supercooled Water Droplet |
| |
| ZHANG Xuan,LIU Xin,WU Xiao-Min,MIN Jing-Chun. Experimental and Modeling Research on the Impact and Freezing of a Supercooled Water Droplet[J]. Journal of Engineering Thermophysics, 2020, 0(2): 402-410 |
| |
| Authors: | ZHANG Xuan LIU Xin WU Xiao-Min MIN Jing-Chun |
| |
| Affiliation: | (Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,epartment of Engineering Mechanics,School of Aerospace Engineering,Tsinghua University,Beijing 100084,China) |
| |
| Abstract: | Impact and freezing of a supercooled water droplet widely exists in macroscopic icing/frost process.The impact and freezing processes of water droplets at room temperature and supercooled state are compared experimentally.A numerical model is established to simulate the impact and freezing of a supercooled water droplet,and the effects of Weber number and contact angle on the impact and freezing process are investigated.The results indicate that the impact and freezing process of a supercooled water droplet yields a larger equilibrium spreading factor compared with this of a droplet at room temperature.With the increases of the supercooling degree and Weber number and the decrease of the contact angle,the differences between impact and freezing process of a supercooled water droplet and the impact process of a droplet at room temperature on the temporal droplet profile and spreading factor become more conspicuous. |
| |
| Keywords: | supercooled droplet nucleation and recalescence impact freezing |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
