化工学报 ›› 2022, Vol. 73 ›› Issue (12): 5405-5413.DOI: 10.11949/0438-1157.20220973
收稿日期:
2022-07-11
修回日期:
2022-11-14
出版日期:
2022-12-05
发布日期:
2023-01-17
通讯作者:
李春曦
作者简介:
刘成治(1998—),男,硕士研究生,lcz06061998@163.com
基金资助:
Chengzhi LIU(), Chunxi LI(), Jingyi ZHOU, Xuemin YE
Received:
2022-07-11
Revised:
2022-11-14
Online:
2022-12-05
Published:
2023-01-17
Contact:
Chunxi LI
摘要:
降膜流动的稳定性对于提高涂膜质量、保障降膜换热器换热性能和促进药物吸收具有重要作用。基于液膜厚度与活性剂浓度的二维非线性演化方程,研究了含表面活性剂的液膜在倾斜平板上流动的稳定性,提出了包括壁面倾角θ、Marangoni数M、Weber数S和Peclet数Pe在内的临界Reynolds数表达式,分析了溶质Marangoni效应、倾角和扰动波数对线性稳定性的影响,探究了溶质Marangoni效应作用下表面波的时空演化特征。结果表明:初始扰动在溶质Marangoni效应影响下分离出快波与慢波,慢波在演化后期发展为多峰波状结构的表面波。增强溶质Marangoni效应可提高临界Reynolds数,扩大液膜流动稳定区并抑制失稳区的扰动增长,削弱表面波的色散效应。提高S和降低Pe均可抑制慢波的演化,而对快波演化基本无影响。
中图分类号:
刘成治, 李春曦, 周静宜, 叶学民. 溶质Marangoni效应对降膜流动稳定性的影响[J]. 化工学报, 2022, 73(12): 5405-5413.
Chengzhi LIU, Chunxi LI, Jingyi ZHOU, Xuemin YE. Influence of solutal Marangoni effect on the stability of falling film flows[J]. CIESC Journal, 2022, 73(12): 5405-5413.
图7 溶质Marangoni效应对表面波演化的影响(实线箭头表示慢波,虚线箭头表示快波)
Fig.7 Influence of solutal Marangoni effect on surface waves evolution(solid arrow represents slow waves, and dashed arrow represents fast waves)
图9 Peclet数对表面波演化的影响(实线箭头表示慢波,虚线箭头表示快波)
Fig.9 Influence of Peclet number on surface waves evolution (solid arrow represents slow waves, and dashed arrow represents fast waves)
图10 Weber数对表面波演化的影响(实线箭头表示慢波,虚线箭头表示快波)
Fig.10 Influence of Weber number on surface waves evolution (solid arrow represents slow waves, and dashed arrow represents fast waves)
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