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Impact of Marangoni instabilities on the fluid dynamic behaviour of organic droplets

机译:Marangoni不稳定性对有机液滴的流体动力学行为的影响

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摘要

Marangoni instabilities in dispersed liquid/liquid systems occur if the local solute concentration varies over the interface. The additional shear stress at the interface between a droplet and an ambient phase generates complex convection patterns which increase temporarily the global drag coefficient of the drop and thus retard the drop rise velocity. When Marangoni effects get weaker, the shear forces decrease and the drop reaccelerates. in the present experimental study, the transient drop rise velocity has been intensely investigated in the system toluene_((d))/acetone_((s))/water_((c)) for different initial solute concentrations and different drop diameters. Both mass transfer directions have been considered. The reacceleration time as an indicator of the end of Marangoni dominance can be expressed as a function of drop diameter and initial solute concentration.
机译:如果局部溶质浓度在界面上发生变化,则在分散的液体/液体系统中会发生Marangoni不稳定性。液滴与环境相之间的界面处的附加剪切应力会产生复杂的对流模式,这些模式会暂时增加液滴的整体阻力系数,从而阻碍液滴的上升速度。当Marangoni效应变弱时,剪切力会降低,并且滴落会加速。在本实验研究中,对于不同的初始溶质浓度和不同的液滴直径,在甲苯_((d))/丙酮_((s))/水_((c))系统中对瞬态液滴上升速度进行了深入研究。已经考虑了两个传质方向。再加速时间可以作为液滴直径和初始溶质浓度的函数来表示马兰戈尼控制权的结束。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2009年第12期|2543-2551|共9页
  • 作者单位

    Chair of Chemical Engineering, Technische Universitaet Berlin, Ackerstrasse 71-76, D-13355 Berlin, Germany;

    Chair of Chemical Engineering, Technische Universitaet Berlin, Ackerstrasse 71-76, D-13355 Berlin, Germany;

    University of Applied Science Berlin, Luxemburger Str. 10, D-13353 Berlin, Germany;

    Chair of Chemical Engineering, Technische Universitaet Berlin, Ackerstrasse 71-76, D-13355 Berlin, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    droplet; solvent extraction; marangoni convection; mass transfer;

    机译:水滴;溶剂萃取;马兰戈尼对流传质;

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