This article describes work aimed at obtaining higher film wise condensation heat flux by distributing dropwise condensation surfaces of optimal width promoted by an organic coating among film wise surfaces, and to get higher mean overall heat transfer coefficients in condensing systems. Several different spacings were examined for the horizontal orientation, arranging a dropwise section above a film wise one, to make clear the effect of the drops falling down to the filmwise section. The heat flux of the filmwise pan increased with increasing the height ofthe dropwisepan up to 2 mm, but then decreased above that. The extent of the film wise pan that was augmented by drops was also tested by changing the width of the filmwise section sandwiched between dropwise sections of constant width. The heat flux of the film wise pan increased abruptly at a width between 5 and 3 mm. Consequently, it was shown that there exists an optimum widlh for each section for enhancing condensation heat transfer in the film wise sections.
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