E109 FILM BOILING HEAT TRANSFER AROUND A VERTICAL FINITE-LENGTH CYLINDER(Pool boiling)

概要

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The film boiling heat transfer from a vertically placed cylinder of finite-length was predicted semi-empirically by taking into account each convective heat transfer on the bottom, side and top surfaces of the cylinder. The heat transfer rate on the bottom surface was analyzed by the method similar to that developed by the authors for a downward-facing horizontal circular plate. For the vertical lateral surface of the cylinder, Bromley's model was applied and modified to accommodate the continuity of the vapor flow rate at the lower end of the vertical surface of the cylinder. Berenson's correlation was adopted on the top surface. The semi-empirical prediction method was compared in terms of boiling curve with the experimental data obtained by quenching method. The prediction was in agreement within 30 percent with the data. To refine the prediction method more accurately, a vapor-film-unit model presented by Nishio and Ohtake was introduced in regard to the vertical surface of the cylinder for the region where the vapor-liquid interface was wavy. The new prediction with this refinement can correlate within 15 percent the experimental data.
一般社団法人日本機械学会の論文
2000-10-01