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Experimental and theoretical study of vibration-induced thermal convection in low gravity

Published online by Cambridge University Press:  07 April 2010

VALENTINA SHEVTSOVA ,
ILYA I. RYZHKOV ,
DENIS E. MELNIKOV ,
YURI A. GAPONENKO  and
ALIAKSANDR MIALDUN
VALENTINA SHEVTSOVA*
Affiliation:
Microgravity Research Centre, Université Libre de Bruxelles, CP-165/62 av. F. D. Roosevelt, 50, B-1050 Brussels, Belgium
ILYA I. RYZHKOV
Affiliation:
Microgravity Research Centre, Université Libre de Bruxelles, CP-165/62 av. F. D. Roosevelt, 50, B-1050 Brussels, Belgium
DENIS E. MELNIKOV
Affiliation:
Microgravity Research Centre, Université Libre de Bruxelles, CP-165/62 av. F. D. Roosevelt, 50, B-1050 Brussels, Belgium
YURI A. GAPONENKO
Affiliation:
Microgravity Research Centre, Université Libre de Bruxelles, CP-165/62 av. F. D. Roosevelt, 50, B-1050 Brussels, Belgium
ALIAKSANDR MIALDUN
Affiliation:
Microgravity Research Centre, Université Libre de Bruxelles, CP-165/62 av. F. D. Roosevelt, 50, B-1050 Brussels, Belgium
*
†Email address for correspondence: vshev@ulb.ac.be
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Abstract

Vibrations acting on a fluid with density gradient induced by temperature variations can cause relative flows. High-frequency vibration leads to the appearance of time-averaged (mean) flows (or streaming flows), which can essentially affect heat and mass transfer processes. This phenomenon is most pronounced in the absence of other external forces (in particular, static gravity). In this work, an extensive experimental and computational study of thermal vibrational convection in a reduced-gravity environment of a parabolic flight is performed. The transient evolution of the temperature field in a cubic cell subjected to translational vibration is investigated by optical digital interferometry. The mean flow structures previously reported in numerical studies are confirmed. The transition from four-vortex flow to a pattern with a large diagonal vortex and two small vortices is observed in the transient state. The experiments reveal a significant enhancement of heat transfer by vibrational mean flows with increasing the vibrational strength. Three-dimensional direct numerical simulation with real microgravity profile and two-dimensional numerical modelling based on averaging approach provide a very good agreement with the experimental results. The influence of residual gravity on heat transfer and bifurcation scenario is first investigated numerically and correlated with the experimental data. It is demonstrated that gravity effects on non-uniformly heated fluids can be reproduced in weightlessness by applying vibrations to the system.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 648 , 10 April 2010 , pp. 53 - 82
Copyright
Copyright © Cambridge University Press 2010

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