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The volume ratio effect on flow patterns and transition processes of thermocapillary convection
- Source :
- Journal of Fluid Mechanics. 868:560-583
- Publication Year :
- 2019
- Publisher :
- Cambridge University Press (CUP), 2019.
-
Abstract
- Thermocapillary convection has always been one of the most important research topics in microgravity fluid physics. A space experimental study on the thermocapillary convection in an open annular liquid pool – a typical thermocapillary flow system – has been conducted on the SJ-10 satellite of China. This space experiment has observed the spatial temperature distribution of the liquid free surface using an infrared thermal imager, obtained the flow pattern transition process, analysed the oscillation characteristics and revealed the instability mechanism of themocapillary convection. The shape effects on the flow instability are researched by changing the volume ratio, Vr, which denotes the ratio of the liquid volume to the volume of the cylindrical gap between the walls. The volume ratio effect has been focused on for the first time. For a certain volume ratio, the flow pattern would transform from the steady state to the oscillation state accompanied by directional propagating hydrothermal waves with increasing temperature difference. In addition, the significant influences of the volume ratio on the critical conditions and wavenumber selection have been analysed in detail.
- Subjects :
- Convection
Steady state
Materials science
Oscillation
Mechanical Engineering
02 engineering and technology
Mechanics
Condensed Matter Physics
01 natural sciences
Instability
010305 fluids & plasmas
Physics::Fluid Dynamics
020401 chemical engineering
Volume (thermodynamics)
Surface-area-to-volume ratio
Mechanics of Materials
Free surface
0103 physical sciences
Thermal
0204 chemical engineering
Subjects
Details
- ISSN :
- 14697645 and 00221120
- Volume :
- 868
- Database :
- OpenAIRE
- Journal :
- Journal of Fluid Mechanics
- Accession number :
- edsair.doi...........5bca9685383aa65e3734e30df6dc0117