Effect of nonstationary thermal gravitation-capillary convection on temperature distribution in a thin vertical wall
V.S. Berdnikov, V.A. Gaponov, V.A. Grishkov, P.M. Likhansky, V.A. Markov
Keywords: thermal gravitational-capillary convection, buoyancy force, thermocapillary effect, hydrodynamics, nonstationary temperature fields in a thin wall, thermographic camera
Pages: 181-191
Abstract
Time dependences of temperature distributions in a thin metal wall were studied experimentally under two conditions of convective heat transfer in a tank model. In the first case, the vertical working wall was heated from within due to a convective heat flux from the opposite wall heated monotonously, and it was cooled due to heat transfer to the ambient medium. Dependence of the temperature field on a thin wall at the stage of convective flow development was retraced with the help of the thermographic camera and thermocouple sensors. In the second case, the tank wall was heated uniformly by IR radiation from the outside, and nonstationary convective flow and volumetric liquid heating were formed inside. Time dependence of temperature distribution over the wall height is studied. It is shown that the flow structure and convective heat transfer in a fuel layer with free boundary are subjected not only to the buoyancy force, but also to the thermocapillary effect. The local features of the flow affect temperature distribution in a thin wall.
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