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Home Archives Thermal Letter Officers Future meetings Assembly for International Heat Transfer Conferences

ISBN Print: 0-89116-909-1

ISSN: 2377-424X

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

NUMERICAL SIMULATION AND HOLOGRAPHIC VISUALIZATION OF DOUBLE DIFFUSIVE CONVECTION IN A HORIZONTAL CONCENTRIC ANNULUS

Get access DOI: 10.1615/IHTC9.2830
pages 181-186

Abstract

The time dependent double diffusive convection in a horizontal concentric annulus was investigated both by numerical analysis and by holographic interferometry. In order to calculate stream functions, the temperature-, concentration- and density-field, the finite difference technique was utilized.
Inner and outer cylinder of the annulus were kept isotherm, with the inner cylinder heated. The annulus was filled with a H2O-NaCI-solution, which was isotherm initially and submitted to a linear and stable stratification of the solution.
The time dependent development of cellular convection as well as Its influence on the heat transfer from the inner cylinder to the fluid is subject of the present investigation. The results reveal a considerable decrease in heat transfer as compared to natural convection without a stabilizing salt gradient. Temporal Nusselt numbers and equivalent thermal conductivities, respectively, are presented and discussed in detail. The essential parameter of influence is the stability number, St. The numerical results coincide quite well with experimental findings.
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