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上升气泡与塑料平板在纯水中的碰撞黏附行为

聂东强 黄学章 孙志强

聂东强, 黄学章, 孙志强等 . 上升气泡与塑料平板在纯水中的碰撞黏附行为[J]. 北京航空航天大学学报, 2019, 45(8): 1569-1574. doi: 10.13700/j.bh.1001-5965.2018.0708
引用本文: 聂东强, 黄学章, 孙志强等 . 上升气泡与塑料平板在纯水中的碰撞黏附行为[J]. 北京航空航天大学学报, 2019, 45(8): 1569-1574. doi: 10.13700/j.bh.1001-5965.2018.0708
NIE Dongqiang, HUANG Xuezhang, SUN Zhiqianget al. Collision and attachment behavior between rising bubble and plastic plate in pure water[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(8): 1569-1574. doi: 10.13700/j.bh.1001-5965.2018.0708(in Chinese)
Citation: NIE Dongqiang, HUANG Xuezhang, SUN Zhiqianget al. Collision and attachment behavior between rising bubble and plastic plate in pure water[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(8): 1569-1574. doi: 10.13700/j.bh.1001-5965.2018.0708(in Chinese)

上升气泡与塑料平板在纯水中的碰撞黏附行为

doi: 10.13700/j.bh.1001-5965.2018.0708
基金项目: 

国家自然科学基金 51876224

湖南省自然科学基金 2017JJ1031

详细信息
    作者简介:

    聂东强   男, 硕士研究生。主要研究方向:多相流测试技术

    孙志强   男, 博士, 教授, 博士生导师。主要研究方向:多相流理论与测试、热设计与传热优化、能源新技术及应用等

    通讯作者:

    孙志强, E-mail: zqsun@csu.edu.cn

  • 中图分类号: O658.6+6;TB872

Collision and attachment behavior between rising bubble and plastic plate in pure water

Funds: 

National Natural Science Foundation of China 51876224

Natural Science Foundation of Hunan Province, China 2017JJ1031

More Information
  • 摘要:

    为了揭示气泡尺寸和表面疏水性对塑料浮选过程的影响规律,采用高速摄影技术观测上升气泡与塑料平板在纯水介质中的碰撞黏附行为。根据气泡速率的变化情况,将碰撞黏附行为细分为碰撞、液膜排液、三相接触线扩散等3个阶段,基于图像处理技术定量分析了气泡碰撞形变、黏附时间、三相接触线扩散特性及其影响因素。结果表明:变形因子随气泡直径的增大由略大于1.00逐渐演化为略小于1.00,疏水性强的塑料平板使相同直径气泡的变形因子更大,碰撞时间随气泡直径的增大而增加,随疏水性的增加而减小。塑料平板疏水性越强,形成三相接触所用时间越短,当气泡直径为1.0 mm时,聚四氟乙烯(PTFE)和聚甲基丙烯酸甲酯(PMMA)平板的液膜排液时间均出现极小值,分别为4.8 ms和56 ms。三相接触线扩散时间随气泡直径的增大而增大,随塑料平板疏水性的增大而减小,在气泡直径大小相同时,三相接触线扩散直径随塑料平板疏水性的减小而减小。

     

  • 图 1  实验系统

    Figure 1.  Experimental system

    图 2  上升气泡与塑料平板碰撞黏附过程

    Figure 2.  Collision and attachment process between rising bubble and plastic plate

    图 3  dB=1.0mm时气泡与PTFE平板碰撞速率变化

    Figure 3.  Speed variation during collision between bubble and PTFE plate when dB=1.0mm

    图 4  不同尺寸气泡与PTFE平板碰撞速率变化

    Figure 4.  Speed variation during collision between bubble with different sizes and PTFE plate

    图 5  临碰撞前气泡的变形因子

    Figure 5.  Bubble deformation factor before collision

    图 6  碰撞时间

    Figure 6.  Collision time

    图 7  液膜排液时间

    Figure 7.  Liquid film discharge time

    图 8  三相接触线扩散时间

    Figure 8.  Diffusion time of three-phase contact line

    图 9  三相接触线扩散直径

    Figure 9.  Diffusion diameter of three-phase contact line

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出版历程
  • 收稿日期:  2018-12-02
  • 录用日期:  2019-03-29
  • 刊出日期:  2019-08-20

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