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力学学报  2015 

分离压对波状基底上活性剂液滴铺展过程的影响

DOI: 10.6052/0459-1879-14-161, PP. 71-81

Keywords: 活性剂液滴,铺展,分离压,不平整基底

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Abstract:

针对波状基底上含不溶性活性剂液滴的铺展过程,引入受活性剂浓度影响的分离压模型,应用润滑理论建立了液滴高度和活性剂浓度演化方程组,通过数值计算方法得到了分离压作用下含活性剂液滴过程的演化特征.研究表明分离压作用下的液滴演化时间显著缩短,铺展速率加快,铺展前沿处衍生出的子波结构明显减少,铺展更加稳定;分离压对液滴铺展稳定性的影响与活性剂关联强度密切相关,减小引力强度系数α1有利于促进液滴的铺展,而减小斥力强度系数α2则起抑制作用,且放大了液滴的演化扰动能量,致使液滴铺展呈现不稳定特征;增加基底高度D或波数k均使液滴铺展速率减慢.

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