摘要
针对波纹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,应用非模态稳定性理论分析液滴铺展稳定性.研究表明:与不计及分离压情形相比,分离压作用下的液滴铺展前沿高度明显下降,液滴铺展速率加快;长波扰动有利于增强液滴的演化稳定性,且随扰动波数增大稳定性增强;然而随短波波数增加,液滴演化稳定性逐渐减弱甚至转变为不稳定;较小波数下(k=3)减小引力强度系数α1和提高斥力强度系数α2液滴铺展稳定性增强;而较大波数下(k=30)增大α1和减小α2有利于液滴铺展稳定性.
For an insoluble surfactant-laden droplet spreading on corrugated topography,a disjoining pressure model induced by concentration of surfactant was established. Non-model stability theory was carried out to investigate stability of spreading. It indicates that compared with droplet spreading without disjoining pressure,under disjoining pressure advancing front height of droplet reduce apparently and spreading rate increases which improves stability of spreading. Long perturbation wave is conducive to enhance stability of droplet evolution and stability is enhanced with increasing wave number. However,spreading stability trends to deteriorate and even transit to unstable with increasing wave number of short perturbation waves. Reducing attraction strength coefficient α1and increasing repulsion strength coefficient α2promote spreading stability at small wave number（ k = 3）. In addition,droplet displays more stable spreading with increasing α1and decreasing α2at large wave number（ k = 30）.
出处
《计算物理》
CSCD
北大核心
2015年第4期437-448,共12页
Chinese Journal of Computational Physics
基金
国家自然科学基金(10972077
11202079)
中央高校基本科研业务费专项基金(13MS97)资助项目
关键词
活性剂液滴
非平整基底
分离压
非模态稳定性
surfactant-laden droplet
topography surface
disjoining pressure
non-model stability
