Instabilities of thermocapillary-buoyancy convection in open rectangular liquid layers

This article presents the experimental investigation on instabilities of thermocapillary-buoyancy convection in the transition process in an open rectangular liquid layer subject to a horizontal temperature gradient. In the experimental run,an infrared thermal imaging system was constructed to obser...

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Published inChinese physics B Vol. 26; no. 11; pp. 316 - 323
Main Author 姜欢;段俐;康琦
Format Journal Article
LanguageEnglish
Published 01.11.2017
Subjects
实验过程
对流不稳定性
开放式
水平温度梯度
浮力对流
矩形
红外热成像系统
线性稳定性分析
Online AccessGet full text
ISSN1674-1056
2058-3834
2058-3834
DOI10.1088/1674-1056/26/11/114703

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Abstract This article presents the experimental investigation on instabilities of thermocapillary-buoyancy convection in the transition process in an open rectangular liquid layer subject to a horizontal temperature gradient. In the experimental run,an infrared thermal imaging system was constructed to observe and record the surface wave of the rectangular liquid layer. It was found that there are distinct convection longitudinal rolls in the flow field in the thermocapillary-buoyancy convection transition process. There are different wave characterizations for liquid layers with different thicknesses. For sufficiently thin layers, oblique hydrothermal waves are observed, which was predicted by the linear-stability analysis of Smith ＆ Davis in 1983. For thicker layers, the surface flow is distinct and intensified, which is because the buoyancy convection plays a dominant role and bulk fluid flow from hot wall to cold wall in the free surface of liquid layers. In addition, the spatiotemporal evolution analysis has been carried out to conclude the rule of the temperature field destabilization in the transition process.
AbstractList This article presents the experimental investigation on instabilities of thermocapillary-buoyancy convection in the transition process in an open rectangular liquid layer subject to a horizontal temperature gradient. In the experimental run,an infrared thermal imaging system was constructed to observe and record the surface wave of the rectangular liquid layer. It was found that there are distinct convection longitudinal rolls in the flow field in the thermocapillary-buoyancy convection transition process. There are different wave characterizations for liquid layers with different thicknesses. For sufficiently thin layers, oblique hydrothermal waves are observed, which was predicted by the linear-stability analysis of Smith ＆ Davis in 1983. For thicker layers, the surface flow is distinct and intensified, which is because the buoyancy convection plays a dominant role and bulk fluid flow from hot wall to cold wall in the free surface of liquid layers. In addition, the spatiotemporal evolution analysis has been carried out to conclude the rule of the temperature field destabilization in the transition process.
Author 姜欢;段俐;康琦
AuthorAffiliation Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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CitedBy_id crossref_primary_10_1007_s12217_020_09859_z
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10.1007/BF02870955
10.1016/j.expthermflusci.2011.06.002
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10.1103/PhysRevE.48.4414
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10.1017/S0022112097008343
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DocumentTitleAlternate Instabilities of thermocapillary-buoyancy convection in open rectangular liquid layers
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Notes thermocapillary-buoyancy convection instability open rectangular liquid layer spatiotemporal evolution
This article presents the experimental investigation on instabilities of thermocapillary-buoyancy convection in the transition process in an open rectangular liquid layer subject to a horizontal temperature gradient. In the experimental run,an infrared thermal imaging system was constructed to observe and record the surface wave of the rectangular liquid layer. It was found that there are distinct convection longitudinal rolls in the flow field in the thermocapillary-buoyancy convection transition process. There are different wave characterizations for liquid layers with different thicknesses. For sufficiently thin layers, oblique hydrothermal waves are observed, which was predicted by the linear-stability analysis of Smith ＆ Davis in 1983. For thicker layers, the surface flow is distinct and intensified, which is because the buoyancy convection plays a dominant role and bulk fluid flow from hot wall to cold wall in the free surface of liquid layers. In addition, the spatiotemporal evolution analysis has been carried out to conclude the rule of the temperature field destabilization in the transition process.
Huan Jiang1,2, Li Duan1,2, Qi Kang1,2（ 1 Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China）
11-5639/O4
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SubjectTerms 实验过程
对流不稳定性
开放式
水平温度梯度
浮力对流
矩形
红外热成像系统
线性稳定性分析
Title Instabilities of thermocapillary-buoyancy convection in open rectangular liquid layers
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