摘要
冷凝过程中,对单个液滴的运动行为进行分析具有重要的意义,因为冷凝面上整体传热量的计算是以单个液滴的形态及动力学行为为基础的。在众多单液滴动力学行为的影响因素中,壁面浸润性占有一定主导作用,但是目前对单个液滴的分析还是基于一定假设条件下的理论分析。针对此问题,本文基于格子Boltzmann方法,并采用多松弛碰撞模型,开展了浸润性对单个液滴动力学行为影响的数值模拟研究。对液滴动力学行为的研究表明,亲疏水表面具有不同的液滴脱离形态,且在液滴的不同生长阶段,发生冷凝的位置也不同。对液滴脱离直径的分析表明,在亲水表面上,理论预测值要大于模拟计算值,而在疏水表面上二者吻合较好。
The study of single droplet dynamics plays a critical role in the analysis of condensation heat transfer,because it’s the basis for condensation heat transfer theoretical models.There are lots factors that influence droplet dynamics and surface wettability plays an important role among them.But at present,the analysis of single droplet is mainly based on analytical method.In this work,the numerical method lattice Boltzmann method was adopted to study droplet dynamics.The simulation results show that droplet behavior on hydrophilic and hydrophobic surfaces was different and the active condensation location was also changed at different growth stages.The radius of departure drops obtained by simulation was smaller than theoretical prediction on hydrophilic surface,while it was in good agreement on hydrophobic surface.
作者
张磊
王涛
姜玉雁
ZHANG Lei;WANG Tao;JIANG Yu-Yan(Research Center for Heat and Mass Transfer,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第12期3030-3035,共6页
Journal of Engineering Thermophysics
基金
中日政府间合作项目(No.2016YFE0118100)
国家自然科学基金(No.51876203)。
