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The response to external excitations in thermocapillary liquid layers

文献类型：期刊论文

作者Hu, KaiXin3; Zheng, Sheng3; Chen QS(陈启生)1,2; Chen QS(陈启生); Hu KX(胡开鑫)
刊名PHYSICS OF FLUIDS
出版日期2021-03-01
卷号33期号:3页码:14
ISSN号1070-6631
DOI10.1063/5.0039833
通讯作者Hu, Kai-Xin(hukaixin@nbu.edu.cn)
英文摘要The responses to external excitations in thermocapillary liquid layers are investigated by non-modal stability theory. The maximum amplification of input signals is measured by a response function depending on the perturbation velocity and temperature. There can be rather large amplifications in subcritical flows at both small and large Prandtl numbers (Pr). For small Pr, the response increases significantly with both the Reynolds number (R) and the Biot number (Bi) but decreases with Pr. The optimal response is achieved when the perturbation is almost a spanwise wave. The response properties for the linear flow and the return flow are similar. The amplification is caused by a combination of the lift-up mechanism, Orr mechanism, and external forcing. However, for large Pr, large amplifications could only be found in the return flow, while the variations of response with Pr and Bi are opposite to those at small Pr. The optimal response propagates in the streamwise direction. The amplification is caused by the thermocapillary effect.
分类号一类/力学重要期刊
资助项目National Natural Science Foundation of China[11872032] ; National Natural Science Foundation of China[U1738119] ; National Natural Science Foundation of China[11772344] ; Zhejiang Provincial Natural Science Foundation[LY21A020006] ; K. C. Wong Magna Fund ; Special research funding from the Marine Biotechnology and Marine Engineering Discipline Group in Ningbo University[422004582]
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000631032300004
资助机构National Natural Science Foundation of China ; Zhejiang Provincial Natural Science Foundation ; K. C. Wong Magna Fund ; Special research funding from the Marine Biotechnology and Marine Engineering Discipline Group in Ningbo University
其他责任者Hu, Kai-Xin
源URL[http://dspace.imech.ac.cn/handle/311007/86189]  
专题力学研究所_国家微重力实验室
作者单位1.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China;
3.Ningbo Univ, Key Lab Impact & Safety Engn, Minist Educ, Sch Mech Engn & Mech, Ningbo 315211, Zhejiang, Peoples R China;
推荐引用方式
GB/T 7714		 Hu, KaiXin,Zheng, Sheng,Chen QS,et al. The response to external excitations in thermocapillary liquid layers[J]. PHYSICS OF FLUIDS,2021,33(3):14.
APA Hu, KaiXin,Zheng, Sheng,陈启生,Chen QS,&Hu KX.(2021).The response to external excitations in thermocapillary liquid layers.PHYSICS OF FLUIDS,33(3),14.
MLA Hu, KaiXin,et al."The response to external excitations in thermocapillary liquid layers".PHYSICS OF FLUIDS 33.3(2021):14.

入库方式： OAI收割

来源：力学研究所

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