抄録
The local heat transfer coefficients of refrigerants HCFC22, HFC134a and HCFC123 condensing inside a horizontal smooth tube are measured in the ranges of total mass velocity of 90 to 400 kg/(m2·s) and heat flux of 3 to 33 kW/m2. Based on the turbulent liquid film theory and Nusselt's theory, an empirical equation for the heat transfer coefficient is proposed in the form of Nu=(Nu2F+Nu2B)1/2, where NuF expresses the effect of vapor shear stress and NuB the effect of gravity force. This equation correlates the experimental results within an error of ±20%
