Study of Drop Coalescence Behavior for Liquid-Liquid Extraction Operation
Study of Drop Coalescence Behavior for Liquid-Liquid Extraction Operation
复制标题
液-液萃取操作中液滴聚结行为的研究
DOI：
10.1016/s0009-2509(00)00156-1
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发表时间：
2000
影响因子：
4.7
通讯作者：
Katsuroku Takahashi
中科院分区：
文献类型：
--
作者：
T. Ban;F. Kawaizumi;S. Nii;Katsuroku Takahashi
使用摄像机，聚结的时间过程中观察到的甲苯液滴形成在相邻的喷嘴在水中的顶部。已经研究了可以控制聚结的几个参数，例如添加到甲苯中的丙酮的浓度、传质的方向、获得液滴接触的时间和连续相的流速。当丙酮从分散相向连续相转移时，平均聚结时间随丙酮浓度降低，并且它们随实现接触所需的时间增加。丙酮浓度较高时，液滴出现振荡现象，抑制了液滴的聚并。当丙酮从连续相向分散相转移时，平均聚结时间增加。已经尝试预测聚结时间在低溶质浓度（无振荡）通过假设的界面张力的差异导致膜排水，并导致滴聚结。计算值和实验值之间的协议是不够的定量，但合理的。对于较低的溶质浓度，计算的聚结时间强烈依赖于达到接触的时间，这是与我们的实验观察。
Using a video camera, a time course of coalescence was observed for toluene droplets formed at the top of adjacent nozzles in water. Several parameters which may control the coalescence have been investigated, such as concentration of acetone added to toluene, direction of mass transfer, time for attaining contact of the droplets, and flow rate of the continuous phase. The average coalescence times decrease with acetone concentration when acetone is transferred from the dispersed phase towards the continuous phase, and they increase with the time required for attaining contact. At high acetone concentration, oscillation of droplets appears, which restrains the coalescence. The average coalescence time increases when the acetone is transferred from the continuous phase towards the dispersed phase. An attempt has been made to predict coalescence times at low solute concentration (no oscillation) by assuming that the difference of interfacial tension causes the film drainage and leads to the drop coalescence. The agreement between the calculated and experimental values is not sufficiently quantitative but reasonable. For lower solute concentration, calculated coalescence times depend strongly on the time for attaining contact, which is in agreement with our experimental observation.