Abstract
In the present study, the characteristics of heat transfer and flow patterns are investigated experimentally for the falling film evaporation of pure refrigerant HCFC123 in a vertical rectangular channel with a serrated-fin surface. A transparent vinyl chloride resin plate is placed as the front wall for direct flow observation. The experiments are performed with the ranges of mass velocity G = 28〜70kg/(m^2s), the heat flux q = 20〜50kW/m^2 and the pressure P ≪ lOOkPa. It is clarified that the heat transfer coefficient a depends on G and q in the region of vapor quality x > 0.3 and the relation between heat transfer and flow pattern. Taking fin efficiency into consideration, heat transfer coefricient af is calculated.
