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中性润湿平板上液膜的惯性收缩

万其文 陈效鹏 胡海豹 杜鹏

万其文, 陈效鹏, 胡海豹, 杜鹏. 中性润湿平板上液膜的惯性收缩. 力学学报, 2022, 54(6): 1516-1522 doi: 10.6052/0459-1879-21-663
引用本文: 万其文, 陈效鹏, 胡海豹, 杜鹏. 中性润湿平板上液膜的惯性收缩. 力学学报, 2022, 54(6): 1516-1522 doi: 10.6052/0459-1879-21-663
Wan Qiwen, Chen Xiaopeng, Hu Haibao, Du Peng. Inertial retraction of liquid film on moderately wettable plate. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(6): 1516-1522 doi: 10.6052/0459-1879-21-663
Citation: Wan Qiwen, Chen Xiaopeng, Hu Haibao, Du Peng. Inertial retraction of liquid film on moderately wettable plate. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(6): 1516-1522 doi: 10.6052/0459-1879-21-663

中性润湿平板上液膜的惯性收缩

doi: 10.6052/0459-1879-21-663
基金项目: 国家自然科学基金(11872315, 52071272, 12102357, 12102358)、基础前沿项目 (JCKY2018-18)、陕西省自然科学基础研究计划(2020JC-18)和河南省水下智能装备重点实验室开放基金(KL01B2101)资助
详细信息
    作者简介:

    陈效鹏, 教授, 主要研究方向: 流体力学、计算流体力学、水动力学. E-mail: xchen76@nwpu.edu.cn

    胡海豹, 教授, 主要研究方向: 流体力学、实验流体力学、水动力学. E-mail: huhaibao@nwpu.edu.cn

  • 中图分类号: O359

INERTIAL RETRACTION OF LIQUID FILM ON MODERATELY WETTABLE PLATE

  • 摘要: 液滴撞击平板的动力学机理研究具有重要的理论与工程价值, 对该过程中液滴的形貌变化及主要影响因素的研究是科学技术界关注的重点之一. 液滴在高速撞击平板达到最大铺展半径以后发生毛细-惯性收缩, 收缩速率满足类Taylor-Culick公式. 结合实验与有限元方法, 对平板上铺展液滴的收缩过程进行了研究. 结果表明, 在中性润湿(接触角约为90°)平板上液滴/液膜的收缩在经历上述收缩过程以后, 会有一个慢匀速收缩过程, 速度约为第一阶段收缩速度的1/10. 对后一阶段的撞击参数影响测试显示, 该收缩过程主要与液体密度、液膜初始形状有关; 而与液体黏性、壁面润湿条件等无关——其仍然是一种毛细-惯性机制主导的液面演化行为, 类似于液体射流的Rayleigh-Plateau失稳. 尽管黏性效应对于液滴撞击的铺展行为有明显影响, 但上述结论在10倍黏性的液体测试中仍然成立. 本研究可以为液滴反弹机理研究和相关工艺控制提供参考.

     

  • 图  1  实验装置图

    Figure  1.  Schematic of the experimental apparatus

    图  2  数值模型与算例校核

    Figure  2.  The numerical model and validation

    3  典型液滴收缩过程. 基底为石蜡膜, 撞击We = 120

    3.  Snapshots of retraction process of a drop. Substrate is parafilm, We = 120

    图  4  液滴撞击不同平板的接触面半径演化, 其中箭头标记点大致与图3各图对应

    Figure  4.  The evolutions of spreading radii. The snapshots in Fig. 3 correspond to the arrows in (b)

    图  5  石蜡平板上液滴撞击过程的形状演化. 蓝、黑、红色分别对应$ We=150, 120, 90 $, “ + ”为 $ \widetilde{R} $, “ × ”为 $ \widetilde{H} $, “○”为$ S $

    Figure  5.  The evolution of geometry of drops impacting on parafilm plates. The blue, black and red symbols represent Weber numbers of $ 150, 120, 90 $, respectively. + : $ \widetilde{R} $, × : $ \widetilde{H} $, ○: $ S $

    图  6  不同条件下液膜收缩过程的数值结果

    Figure  6.  Numerical results with various parameters

    表  1  固体平板润湿性

    Table  1.   The wettability of the substrates

    Material$ {\theta }_{a} $/(°)$ {\theta }_{r} $/(°)
    glass3124
    TEFLON9160
    parafilm12089
    coated161150
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-12-13
  • 录用日期:  2022-02-28
  • 网络出版日期:  2022-03-01
  • 刊出日期:  2022-06-18

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