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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v11.i2.20
12 pages

THERMOCAPILLARY CONVECTION AROUND A HORIZONTAL HEAT SOURCE IN A LIQUID CAVITY

Wen-Jei Yang
Department of Mechanical Engineering and Applied Mechanics University of Michigan, Ann Arbor, Michigan 48109-2125, U.S.A.

RÉSUMÉ

Numerical and experimental studies are performed on thermal fluid-flow transport phenomena around a heating wire set on the free surface of a liquid cavity. Emphasis is placed on the effects of the Marangoni number, Ma, the aspect ratio, H/L, and the Rayleigh number, Ra, on the flow and isothermal fields. The mechanism is theoretically investigated by numerically solving the two-dimensional governing equations through discretization by means of a finite-difference technique. Experimentally, flow patterns are disclosed by means of a tracer method. It is found that (i) the thermal fluid flow is affected by the aspect ratio, that is the thermal fluid flow in the lower region of the cavity with H/L = 2 is almost stable, and (ii) natural convection around the wire is induced by the Marangoni force, i.e., the surface tension, while the effect of Ra on the velocity field is minor.