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液滴平壁铺展过程中的滞后效应及力学机制研究

焦云龙 刘小君 逄明华 刘焜

焦云龙, 刘小君, 逄明华, 刘焜. 液滴平壁铺展过程中的滞后效应及力学机制研究[J]. 应用数学和力学, 2016, 37(1): 14-26. doi: 10.3879/j.issn.1000-0887.2016.01.002
引用本文: 焦云龙, 刘小君, 逄明华, 刘焜. 液滴平壁铺展过程中的滞后效应及力学机制研究[J]. 应用数学和力学, 2016, 37(1): 14-26. doi: 10.3879/j.issn.1000-0887.2016.01.002
JIAO Yun-long, LIU Xiao-jun, PANG Ming-hua, LIU Kun. Study of Contact Angle Hysteresis at Moving Contact Lines Based on CFD Simulation and Mechanical Analysis[J]. Applied Mathematics and Mechanics, 2016, 37(1): 14-26. doi: 10.3879/j.issn.1000-0887.2016.01.002
Citation: JIAO Yun-long, LIU Xiao-jun, PANG Ming-hua, LIU Kun. Study of Contact Angle Hysteresis at Moving Contact Lines Based on CFD Simulation and Mechanical Analysis[J]. Applied Mathematics and Mechanics, 2016, 37(1): 14-26. doi: 10.3879/j.issn.1000-0887.2016.01.002

液滴平壁铺展过程中的滞后效应及力学机制研究

doi: 10.3879/j.issn.1000-0887.2016.01.002
基金项目: 国家自然科学基金(51375132)
详细信息
    作者简介:

    焦云龙(1990—),男,博士生(E-mail: jiaoyunlong0823@126.com);刘焜(1963—),男,教授,博士生导师(通讯作者. E-mail: liukun@hfut.edu.cn).

  • 中图分类号: O359

Study of Contact Angle Hysteresis at Moving Contact Lines Based on CFD Simulation and Mechanical Analysis

Funds: The National Natural Science Foundation of China(51375132)
  • 摘要: 研究了液滴平壁铺展过程中的接触角滞后效应,从接触线附近流体的压力、速度以及能量分布等角度考虑滞后效应的成因和变化规律.在此基础之上分析了固体表面粗糙度对滞后效应的影响,并借助部分三维形貌参数(ISO 25178)建立了固体表面形貌与接触角滞后效应之间的量化关系.为了研究以上内容,应用数值仿真软件建立了液滴铺展动力学模型,并结合固体表面上的滞后性实验进行了相关验证.研究结果表明:由于表面粗糙度的存在,液滴铺展至平衡位置时,位于铺展前沿的液体分子被钉扎在固体表面的凹坑或低谷中,使得前沿接触角逐渐增大,后沿接触角逐渐减小,接触角发生滞后;驱动液滴铺展的Laplace压力和自身重力与阻碍液滴铺展的黏性阻力之间的平衡关系,是接触角发生滞后的主要力学机制.另外,实验结果表明接触角滞后效应与固体表面形貌密切相关,具有相同表面粗糙度(Sa)的固体表面,由于表面形貌不同接触角滞后效应可能存在明显的差异.
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出版历程
  • 收稿日期:  2015-08-28
  • 修回日期:  2015-12-07
  • 刊出日期:  2016-01-16

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