日本機械学会論文集 B編
Online ISSN : 1884-8346
Print ISSN : 0387-5016
過熱水蒸気乾燥における凝縮から蒸発への反転過程〔熱工学, 内燃機関, 動力など〕
伊與田 浩志西村 伸也野邑 奉弘
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ジャーナル フリー

63 巻 (1997) 612 号 p. 2764-2770

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For clarification of the mechanism of heat and mass transfer in the early stages of superheated steam drying which accompanies condensation and evaporation, an experiment in which a water surface was used as a dried material was conducted under atmospheric pressure. Temperature profiles for in both the gas phase and the liquid phase near the water surface and the liquid level were measured precisely. From the results, heat transfer rates at the water surface and the amount of steam condensed into water were determined ; in addition, the relationship between these two was investigated both experimentally and theoretically. Furthermore, a characteristic curve of drying accompanying condensation and evaporation in the early stages of superheated steam drying was derived semi-empirically. In this drying characteristic curve, there is a point at which neither condensation nor evaporation occurs. This is defined as the "reverse point". Introduction of this reverse point. and the time ratio for condensation and evaporation during the early stages of superheated steam drying are clarified.

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