Journal ArticleDOI
Temperature and velocity fields due to surface tension driven flow
D. Raake,J. Siekmann,Ch. H. Chun +2 more
TLDR
In this paper, temperature and velocity fields near an air-bubble in silicon-oil under a heated horizontal wall were investigated with neutral-buoyant light scattering glass spheres by observing the meridian plane of the bubble with a thin light-sheet.Abstract:
Temperature and velocity fields near an air-bubble in silicon-oil under a heated horizontal wall were investigated. The studies were made with silicon oils of different viscosities so that a wide range of Marangoni numbers was encountered. Schlieren interferograms were taken to analyse the temperature field. For the axisymmetric problem the Abel integral equation was solved numerically by using a coefficient procedure. From the recorded temperature distributions isotherms, radial temperature lines and the temperature along the bubble surface were determined graphically. At low Prandtl- and high Marangoni-numbers an oscillatory instability was observed. The flow field was investigated with neutral-buoyant light scattering glass spheres by observation of the meridian plane of the bubble with a thin light-sheet. The convective mechanism of the flow was recorded photographically by taking pictures with various exposure times. Thus a qualitative and quantitative description of the flow was possible.read more
Citations
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Journal ArticleDOI
Marangoni heat transfer in subcooled nucleate pool boiling
TL;DR: In this paper, a heat transfer model was developed in order to explain the phenomena observed in nucleate pool boiling, and the results indicated that Marangoni convection associated with the bubbles formed by the air dissolved in the water which emerged from solution when the water was heated sufficiently, significantly influenced the heat transfer rate in subcooled nucleate pools boiling.
Journal ArticleDOI
Experimental analysis of the heat transfer induced by thermocapillary convection around a bubble
TL;DR: In this paper, the surface tension driven flow in the liquid vicinity of gas bubbles on a heated wall and its contribution to the heat transfer are investigated experimentally in a configuration where surface tension force and buoyancy forces oppose one another.
Journal ArticleDOI
Particle-image-velocimetry applied to thermocapillary convection
K. Wozniak,G. Wozniak,T. Roêsgen +2 more
TL;DR: In this article, the authors used particle image-velocimetry for flow visualization and analysis, which offers the advantage of measuring the entire flow field (velocity field, streamlines etc) in a selected plane within the fluid at a given instant of time.
Journal ArticleDOI
Steady and oscillatory thermocapillary convection generated by a bubble
M. Kassemi,N. Rashidnia +1 more
TL;DR: In this paper, a combined numerical-experimental approach was used to capture the dynamic characteristics of the time-dependent convection using the index of refraction fringe distribution patterns constructed numerically by taking an inverse Abel transform of the computed temperature fields.
Journal ArticleDOI
Heater size and heater aspect ratio effects on subcooled pool boiling heat transfer in low-g
TL;DR: In this paper, pool boiling heat transfer measurements using heaters of varying aspect ratio were obtained in low-g (0.01 −g −0.025 −g) with a KC-135 aircraft.
References
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Journal ArticleDOI
Low-Gravity Fluid Flows
TL;DR: In this article, the behavior of fluids in microgravity conditions is examined, with particular regard to applications in the growth of single crystals, and the effects of gravity on fluid behavior are reviewed, and a Shuttle flight is noted to offer extended time for experimentation and processing in a null-gravity environment, with accelerations resulting solely from maneuvering rockets.
Journal ArticleDOI
Thermocapillary flow near a hemispherical bubble on a heated wall
Y. S. Kao,D. B. R. Kenning +1 more
TL;DR: In this paper, the authors investigated the flow driven by variations in surface tension round a hemispherical gas or vapour bubble on a heated wall, for steady-state conditions over a wide range of values of dimensionless parameters, and experimentally for one set of conditions.
Coefficients for axisymmetric schlieren evaluations
TL;DR: The quantitative evaluation of schlieren measurements of a broad class of axisymmetric gaseous phenomena can be performed by a procedure which is simple to apply and insensitive to experimental error.
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Particle-image-velocimetry applied to thermocapillary convection
K. Wozniak,G. Wozniak,T. Roêsgen +2 more