高分子被覆面における滴状凝縮の狭さく熱抵抗の研究

概要

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The effect of the thermal properties of the polymer coating on the dropwise condensation heat transfer was studied theoretically and experimentally. Fundamental equations describing the constriction resistance phenomena caused by the polymer coating were obtained by considering the contribution of the droplet resistance in the individual drop-size class to the thermal resistance in the so-called transient dropwise condensation. In the experiments, fluoroethylene propylene (FEP) was coated on the copper block and heat-transfer measurements were performed for dropwise condensation of steam in a pressure range from atmospheric down to 2kPa. The experimental data show that the heat-transfer coefficient is dependent upon the coating thickness. Also, the measured heat-transfer coefficients agreed satisfactorily with the theoretical predictions. It is then confirmed that the heat-transfer coefficient decreases with increasing thickness of the polymer coating due to increasing constriction resistance.
一般社団法人日本機械学会の論文
1990-08-25