流下液膜式プレートフィン蒸発器内での純冷媒HCFC123の伝熱および流動特性

概要

論文の詳細を見る
In the present study, the characteristics of heat transfer and flow pattern are investigated experimentally for the falling film evaporation of pure refrigerant HCFC123 in a rectangular channel with a serrated-fin surface. The distributor is set at the top of the channel to supply the refrigerant liquid uniformly. The liquid flowing down vertically is heated electrically from the rear wall of the channel. A transparent vinyl chloride resin plate is placed as the front wall in order to observe the flow pattern in evaporation process directly. The experimental ranges are as follows: the mass velocity G=28～70kg/(m^2s), the heat flux q=20～50kW/m^2 and the pressure P≈100kPa. It is clarified that the heat transfer coefficient a depends on G and q in the region of vapor quality x≥0.3, while there is little influence of G and q in the region x≤0.3. From the direct observation, the relation between heat transfer and flow pattern is clarified. The results of α are also compared with some previous correlation equations.
九州大学の論文
1997-03-15