Abstract
Condensation experiments were carried out at atmospheric pressure using water-cooled horizontal and slightly inclined flat plates, varying the air concentrations and the orientations (upward or downward facing). The plate was suspended in a cylindrical test section and exposed to a very slow flow of pure steam or mixtures of steam and air from underneath. For the slightly inclined cases, the test results showed good agreement with the existing studies and reproduced the typical inclined plate phenomena. For the horizontal cases, the downward facing plate showed twice as high heat transfer rates as the upward facing one. The air contained in the steam showed negligible effects for the upward facing plate but a systematic decrease in heat transfer for the downward facing one. The condensation heat transfer beneath the downward facing horizontal plate is influenced by the surface wetting characteristics.
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