Filmwise Condensation in a Vertical Tube in Counter-current and Co-current Flow�
Abstract
Condensation of steam in a vertical reflux condenser was studied for both co-current and counter-current flow of the vapor and condensate. The condenser was composed of three sections in series. The cooling water flowed inside the annular jackets, while the steam was in the inner tube. This was only a preliminary study of heat transfer, including the condensing heat transfer coefficient and the heat transfer coefficient in the annulus. The present study covered a range of cooling water Reynolds numbers from 460 to 3,800 based on the equivalent diameter. Entering steam Reynolds numbers ranged from 5 6 4.1x10 to 1.2x10 , while the exit condensate Reynolds numbers ranged from 30 to 450 From experimental data, the condensing heat transfer coefficient, the annular heat transfer coefficient. and conduction heat transfer through the pyrex glass wall were calculated from heat transfer correlations, and then compared to the ones obtained from the Wilson Line Method applied to the data. In addition. for counter-current flow, the flooding point was also computed by the Diehl-Koppany and Wallis correlations.
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- OSU Theses [15752]