文章摘要
谢俊,赵冰姿,李晨曦,付峥,李润东.微米颗粒撞击液滴表面动力学行为特性研究[J].,2024,64(2):138-147
微米颗粒撞击液滴表面动力学行为特性研究
Research on dynamic behavior characteristics of micron particle impacting on droplet surface
  
DOI:10.7511/dllgxb202402004
中文关键词: 颗粒  撞击  液滴表面  表面张力  形状阻力
英文关键词: particles  impact  droplet surface  surface tension  form drag
基金项目:国家自然科学基金青年基金资助项目(51906164);科技部国家重点研发计划项目(2019YFC1903902).
作者单位
谢俊,赵冰姿,李晨曦,付峥,李润东  
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中文摘要:
      颗粒撞击液滴表面的过程广泛存在于日常生活和工业生产中,且国内外对微米颗粒撞击液滴表面过程的研究较少,因此采用数值计算法对微米颗粒撞击液滴表面的行为进行了研究.建立了颗粒撞击液滴表面的动力学模型,对颗粒的撞击过程进行研究,深入分析了不同初始撞击速度下,撞击过程中颗粒受力、位移和三相接触角的变化情况.研究发现,颗粒在撞击液滴表面的过程中,表面张力和形状阻力是最主要的作用力.对于10μm颗粒,沉没和反弹之间的临界速度为9.080 m/s,反弹和振荡之间的临界速度为1.323 m/s,在沉没过程中,主导作用力由形状阻力变为表面张力.在反弹和振荡过程中,其运动分为下沉和回弹两部分.下沉过程中,主导作用力由形状阻力变为表面张力;回弹过程中,主导作用力先由表面张力变为形状阻力,然后又变回表面张力.初始撞击速度越大,颗粒在撞击过程中受到的作用力越强,速度、位移和三相接触角的变化速度越快,颗粒越容易沉没到液滴之中.
英文摘要:
      The processes of particles impacting on droplet surface are observed frequently in daily life and industrial applications. There are few researches on the impacting of micron particles on droplet surface all over the world. So the impact behavior of micron particles on droplet surface is studied by numerical calculation method. The dynamic model of particles impacting on droplet surface is established to study the impacting process. The changes of force, displacement and three-phase contact angle during particles impacting under different initial impacting velocities are analyzed. It is found that the surface tension and form drag are the main forces when particles impact on droplet surface. For 10 μm particles, the critical velocity between sinking and bounce is 9.080 m/s, and that between bounce and oscillation is 1.323 m/s. During the sinking process, the dominant force changes from form drag to surface tension. In the process of bounce and oscillation, its motion is divided into two parts: subsidence and rebound. During the subsidence process, the dominant force changes from form drag to surface tension. In the rebound process, the dominant force changes from surface tension to form drag, then changes back to surface tension. The higher the initial impacting velocity, the greater the force, the faster the velocity, displacement, three-phase contact angle of particles change, and the easier the particles sink into the droplet.
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