Abstract
In dropwise condensation most of the heat is transferred by the active droplets whose sizes are below a certain characteristic value so that the thermal conduction resistance inside them may become negligible. In this paper the local heat transfer coefficient is determined experimentally at the very part of the condenser surface which is covered solely by the active droplets. The rate of increase in the condensate volume in a domain newly exposed by coalescence between droplets was analyzed from a high-speed high-magnification cine film record of the condenser surface. By assuming the complete coverage of the surface by droplets, the local heat transfer coefficient obtained in this way was equated to the interfacial heat transfer coefficient. As a result, the condensation coefficient of water was estimated at around 0.5.
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