Abstract
The effect of the thermal properties of the condenser material on dropwise condensation heat-transfer was studied experimentally. Quartz glass, stainless steel, and carbon steel were employed as the condenser material, and the heat-transfer coefficient for steam was obtained very carefully and precisely using thin-film resistance thermometers deposited on the condensing surface. All tests were conducted in a pressure range from 10 kPa down to 1 kPa to minimize the effect of nucleation-site density on the heat transfer. The experimental data show that the heat-transfer coefficients is dependent upon the surface thermal conductivity. Also, the measured heat-transfer coefficients agreed satisfactorily with the predictions from the previously developed constriction resistance theory. It is then confirmed that the heat-transfer coefficient decreases with the surface thermal conductivity due to increasing constriction resistance.
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