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力学学报  2013 

含活性剂超薄液膜演化过程的稳定性研究

DOI: 10.6052/0459-1879-12-381, PP. 681-689

Keywords: 超薄液膜,分离压,表面活性剂,稳定性

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Abstract:

针对固体基底上厚度小于100nm的含活性剂超薄液膜演化过程,基于润滑理论推导出包含分离压影响的液膜厚度和活性剂浓度的演化方程,采用正则模态法导出了描述液膜线性稳定性的特征方程,分析了多个特征参数对线性稳定性的影响,数值模拟了液膜厚度和活性剂浓度演化历程,对比了模拟所得非线性结果与线性分析预测结果的一致性.结果表明范德华力具有促进扰动增长的作用,较强的玻恩斥力促使扰动衰减,使液膜趋于稳定;较小的毛细力数易使液膜凹陷处发生二次失稳,并最终导致去润湿现象发生;液膜厚度和溶于液膜内部的活性剂浓度初值越大,液膜稳定性越强,液膜表面活性剂浓度影响则相反;增大吸附系数不利于液膜稳定性.

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