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Numerical investigation of the impacting and freezing process of a single supercooled water droplet
Physics of Fluids ( IF 4.6 ) Pub Date : 2021-04-21 , DOI: 10.1063/5.0048206
Yongkui Wang 1 , Lei Ju 1 , Duanfeng Han 1 , Qing Wang 1
Affiliation  

In order to study the mechanism of ice formation after water droplets produced by splashing waves attach to ship superstructure in cold ocean regions, a numerical framework that considers the effect of supercooling degree on the meso-scale water droplet freezing is developed to explore the freezing mechanism of water droplets after impacting. This model can track the solid–liquid and air–liquid interface together using a coupled volume-of-fluid and level set multiphase method and Enthalpy-Porosity phase change method. The model introduces a mixed fraction to describe the problem of three-phase unification. The simulation results of the center freezing height and droplet spreading factor in this paper are consistent with the experimental results in related literature, which verifies the accuracy of the framework. The study includes a detailed description of the dynamic and thermodynamics mechanism of the water droplet. The influence factors of droplet impacting and freezing process are analyzed. The analysis results show that the surface wettability, supercooling degree, and impact velocity have a great influence on the freezing behavior of droplets. This model can deepen the understanding of icing mechanism on ship superstructure surface, provide an indication for engineers to develop an accurate prediction method of ice accretion on ship superstructure surface.

中文翻译:

单个过冷水滴撞击和冻结过程的数值研究

为了研究寒海地区飞溅波产生的水滴附着在船舶上部结构后的结冰机理,建立了考虑过冷度对中尺度水滴冻结影响的数值框架,探讨了冻结机理。撞击后的水滴。该模型可以使用耦合的流体体积和水平集多相方法以及焓-孔隙率相变方法一起跟踪固-液和气-液界面。该模型引入了混合分数来描述三相统一问题。本文的中心冻结高度和液滴散布因子的仿真结果与相关文献的实验结果相吻合,验证了该框架的准确性。该研究包括对水滴的动力学和热力学机理的详细描述。分析了液滴撞击和冻结过程的影响因素。分析结果表明,表面润湿性,过冷度和冲击速度对液滴的冻结行为有很大影响。该模型可以加深对船舶上部结构表面结冰机理的理解,为工程师开发准确的船舶上部结构表面结冰预测方法提供指导。冲击速度对液滴的冻结行为有很大的影响。该模型可以加深对船舶上部结构表面结冰机理的理解,为工程师开发准确的船舶上部结构表面结冰预测方法提供指导。冲击速度对液滴的冻结行为有很大的影响。该模型可以加深对船舶上部结构表面结冰机理的理解,为工程师开发准确的船舶上部结构表面结冰预测方法提供指导。
更新日期:2021-04-30
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