Abstract
The effect of the thermal properties of the condenser material on dropwise condensation heat transfer is studied experimentally. Quartz glass, stainless steel, and carbon steel are employed as the condenser materials. The heat transfer coefficient for steam is measured very carefully and precisely using thin-film resistance thermometers deposited on the condensing surface. All tests are 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 definitely show that the heat transfer coefficient is dependent upon the surface thermal conductivity. Also, the measured heat transfer coefficients agree satisfactorily with the predictions by the previously developed constriction resistance theory. It is confirmed that the heat transfer coefficient decreases with the surface thermal conductivity due to increasing constriction resistance.
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