A theoretical study on the constriction resistance in dropwise condensation.

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  • 滴状凝縮熱伝達における狭さく熱抵抗の理論的研究
  • テキジョウ ギョウシュク ネツ デンタツ ニ オケルキョウサク ネツ テイコウ

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Abstract

The effect of the thermal conductivity of the condenser material on the dropwise condensation heat-transfer has been studied analytically. By taking account of the contribution of the droplet resistance in the individual dropsize class to the thermal resistance in the transient dropwise condensation, the authors derive a fundamental differential equation describing the constriction resistance phenomenon caused by the inhomogeneity of the surface heat flux. It is found from the nondimensionalized form of the fundamental equation that the constriction resistance can be determined by a Biot number defined with the interfacial heat-transfer coefficient, the departing drop radius and with the surface thermal conductivity, in addition to a few characteristic parameters. By applying the so-called equilibrium region of small drops as the drop-size distribution, this equation is solved numerically so that the effects of these parameters on the heat-transfer coefficient are presented.

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