Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10391771 | Experimental Thermal and Fluid Science | 2011 | 8 Pages |
Abstract
Free convection phenomenon has been experimentally investigated around a horizontal rod heater in carbonic acid solution. Because of the tendency of the solution to desorb carbon dioxide gas when temperature is increased, bubbles appear when cylinder surface is heated. The bubbles consists mainly carbon dioxide and also a negligible amount of water vapor. The results present that dissolved carbon dioxide in water significantly enhances the heat transfer coefficient in compare to pure free convection regime. This is mainly due to the microscale mixing on the heat transfer surface, which is induced by bubble formation. In this investigation, experiments are performed at different bulk temperatures between 288 and 333Â K and heat fluxes up to 400Â kWÂ mâ2 at atmospheric pressure. Bubble departure diameter, nucleation site density and heat transfer coefficient have been experimentally measured. A model has been proposed to predict the heat transfer coefficient.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
S.A. Alavi Fazel, A. Arabi Shamsabadi, M.M. Sarafraz, S.M. Peyghambarzadeh,