分离压/结合压作用下的活性剂液滴演化特征

doi:10.3969/j.issn.0438-1157.2013.10.013

化工学报 ›› 2013, Vol. 64 ›› Issue (10): 3581-3589.DOI: 10.3969/j.issn.0438-1157.2013.10.013

分离压/结合压作用下的活性剂液滴演化特征

叶学民, 姜凯, 李春曦

华北电力大学电站设备状态监测与控制教育部重点实验室, 河北保定 071003

收稿日期:2013-02-27 修回日期:2013-06-16 出版日期:2013-10-05 发布日期:2013-10-05
通讯作者: 叶学民(1973-),男,博士,教授
作者简介:叶学民(1973-),男,博士,教授。
基金资助:
国家自然科学基金项目(10972077,11202079);中央高校基本科研业务费专项基金项目(13MS97)

Droplet spreading with soluble surfactant under disjoining pressure/conjoining pressure

YE Xuemin, JIANG Kai, LI Chunxi

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Baoding 071003, Hebei, China

Received:2013-02-27 Revised:2013-06-16 Online:2013-10-05 Published:2013-10-05
Supported by:
supported by the National Natural Science Foundation of China(10972077,11202079)and the Fundamental Research Funds for the Central Universities(13MS97).

摘要/Abstract

摘要： 当含活性剂液膜厚度小于100 nm时,分子间力表现出的分离压或结合压效应将对其演化特征及去润湿特性产生重要影响。针对可溶性活性剂液滴的铺展历程,采用润滑理论建立了液膜厚度、活性剂表面浓度和内部浓度的演化模型,模拟了正负体系中受分离压或结合压影响的液滴演化过程。结果表明,分离压可促进正体系下的液滴稳定铺展,并抑制去润湿现象的发生;而负体系下,分离压则加剧不稳定性,并改变Marangoni负效应对液滴演化的影响。正体系下液滴受结合压作用呈现不稳定特征,在极短时间内发生破断;结合压对负体系下的液滴演化影响与分离压作用相似,具有促进液滴不稳定演化的作用。

关键词: 可溶性活性剂, 液滴, 铺展, 分离压, 结合压

Abstract: A liquid film of thickness less than 100 nm with soluble surfactant is subject to disjoining pressure or conjoining pressure induced by intermolecular forces,which determines its stability and wettability.In the present paper,based on three nonlinear partial differential evolution equations for film thickness,surfactant interfacial concentration and bulk concentration derived from the lubrication theory,the processes of droplet spreading driven by surfactant under the action of intermolecular forces in positive and negative systems were simulated numerically,and the effect of intermolecular forces,collectively called disjoining pressure or conjoining pressure,was analyzed.Disjoining pressure promoted droplet spreading stably and inhibited film dewetting occurrence in a positive system; disjoining pressure played a destabilizing role in a negative system by amplifying perturbations,and changing the effect of Marangoni stress.The droplet in a positive system presented unstable evolution characteristics under conjoining pressure,which led to film rupture ultimately; in a similar effect with disjoining pressure,conjoining pressure further enhanced the instability of droplet evolution in a negative system.

Key words: soluble surfactant, droplet, spreading, disjoining pressure, conjoining pressure

中图分类号:

TQ423
O363

叶学民, 姜凯, 李春曦. 分离压/结合压作用下的活性剂液滴演化特征[J]. 化工学报, 2013, 64(10): 3581-3589.

YE Xuemin, JIANG Kai, LI Chunxi. Droplet spreading with soluble surfactant under disjoining pressure/conjoining pressure[J]. CIESC Journal, 2013, 64(10): 3581-3589.

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分离压/结合压作用下的活性剂液滴演化特征

Droplet spreading with soluble surfactant under disjoining pressure/conjoining pressure

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