Peculiarities of Surfactant Extraction by a Droplet from its Homogeneous Solution

IF 1.3 4区工程技术 Q2 ENGINEERING, AEROSPACE

Microgravity Science and Technology Pub Date : 2023-05-26 DOI:10.1007/s12217-023-10051-2

M. O. Denisova, K. G. Kostarev

引用次数: 0

Abstract

The process of surfactant extraction by a droplet from the surrounding homogeneous solution was studied experimentally via selecting the system of liquids in which the surfactant concentration in the droplet (upon completion of the diffusion) is many times higher than its initial concentration in the environment. It has been found that, under normal gravity, a significant concentration gradient is formed in the droplet, which results in the development of Marangoni convection, although an external gradient is absent. Visualization of flow patterns and concentration fields in the droplet and the environment made it possible to trace their evolution and to determine the conditions for occurrence of an oscillatory mass transfer regime. The results obtained demonstrate how the surfactant concentration and its vertical distribution vary vs. the droplet diameter, the initial surfactant concentration in the surrounding liquid and the time elapsed from the droplet formation.

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液滴从均相溶液中萃取表面活性剂的特性

通过选择液滴中表面活性剂的浓度(扩散完成后)比其在环境中的初始浓度高许多倍的液体体系，实验研究了液滴从周围均匀溶液中提取表面活性剂的过程。研究发现，在正常重力作用下，液滴内部会形成一个显著的浓度梯度，导致马兰戈尼对流的发展，尽管外部梯度不存在。液滴和环境中的流动模式和浓度场的可视化使得跟踪它们的演变和确定振荡传质状态发生的条件成为可能。结果表明，表面活性剂浓度及其垂直分布随液滴直径、周围液体中表面活性剂初始浓度和液滴形成时间的变化而变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Microgravity Science and Technology 工程技术-工程：宇航

CiteScore

3.50

自引率

44.40%

发文量

期刊介绍： Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology