Transient rise velocity and mass transfer of a single drop with interfacial instabilities - : experimental investigations
Transient rise velocity and mass transfer of a single drop with interfacial instabilities - : experimental investigations
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DOI：
10.1016/j.ces.2007.03.003
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发表时间：
2007-06
影响因子：
4.7
通讯作者：
M. Wegener;J. Grünig;J. Stüber;A. Paschedag;M. Kraume
中科院分区：
文献类型：
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作者：
M. Wegener;J. Grünig;J. Stüber;A. Paschedag;M. Kraume
在甲苯/丙酮/水体系中进行了瞬态液滴上升速度和传质速率的实验研究。本文研究了甲苯液滴在无溶质（丙酮）存在下的上升速度，在1-3 mm的液滴范围内，以及在有溶质存在下，2 mm液滴的上升速度。转移溶质的初始浓度从0到30 g/L变化。瞬态液滴上升速度被用来量化的Marangoni效应，因为阻力系数取决于由界面张力梯度引起的Marangoni对流模式的强度。此外，进行了传质测量，以确定由于Marangoni对流的传质速率的修改。然后通过接触时间将速度和传质测量关联起来。结果表明，存在一个范围内的溶质浓度的临界值可以定义为马兰戈尼对流。
An experimental study of transient drop rise velocities and mass transfer rates was carried out in the system toluene/acetone/water which is known to show interfacial instabilities. The rise velocity of toluene drops was studied without added solute (acetone) in the diameter range 1–3 mm and with added solute for 2mm drops. The initial concentration of the transferred solute was varied from 0 to 30g/L. The transient drop rise velocities were used to quantify the Marangoni effect since the drag coefficient depends on the strength of the Marangoni convection patterns caused by interfacial tension gradients. In addition, mass transfer measurements were carried out in order to determine the modification of the mass transfer rate due to Marangoni convection. Velocity and mass transfer measurements were then correlated via the contact time. Results reveal the existence of a range in which a critical value for the solute concentration can be defined for Marangoni convection.