Local analysis of Marangoni effects during and after droplet formation

Local analysis of Marangoni effects during and after droplet formation
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液滴形成期间和之后的马兰戈尼效应的局部分析

DOI:
10.1002/cjce.23685
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发表时间:
2019
影响因子:
2.1
通讯作者:
H.-J. Bart
H.-J. Bart
中科院分区:
工程技术4区
文献类型:
--
作者:
J. S. Heine;H.-J. Bart

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研究了丙酮和乙腈两种过渡组分在甲苯中的静态水相连续相液-液萃取过程中液滴形成过程对传质的影响。这两个过渡组件具有相似的特征。然而,可以观察到悬浮在毛细管上的液滴相对于上升的液滴的传质速度大约慢8倍。液滴形成时间和初始溶质浓度对传质行为起决定性作用。较低的体积流量导致液滴形成较慢,较高的比传质面积增强了传质,这通过激光诱导荧光(LIF)进行了可视化。此外,正如预期的那样,较高的初始溶质浓度促进了Marangoni湍流,从而促进了质量传递,这是通过固定悬浮液滴内的共聚焦拉曼光谱测量的。
The influence on the mass transfer in liquid‐liquid extraction was investigated during droplet formation in a quiescent aqueous continuous phase for the two transition components, acetone and acetonitrile, in toluene. Both transition components have similar characteristics. However, an approximately eight times slower mass transfer of a droplet hanging on a capillary in relation to a rising droplet could be observed. The droplet formation time and the initial solute concentration are decisive for the mass transfer behaviour. A lower volumetric flow leads to slower droplet formation and a higher specific mass transfer area enhancing mass transfer, which is visualized via laser induced fluorescence (LIF). Additionally, as expected, higher initial solute concentrations promote Marangoni turbulences and thus mass transfer, which is measured via confocal Raman spectroscopy inside a fixed hanging droplet.
DOI: 10.1002/cite.201700045
发表时间: 2017-12-01
影响因子: 1.9
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