Two-phase Frictional Pressure dro‎p in Horizontal Channels

This study compares 5 well-known two-phase pressure drop models in horizontal channels and presents one of them as an optimum model. In order to reach this aim a set of data points which contains 90 points is used. This set of data points covers 6 fluids (CO2, R-134a, R-22, R-236ea, R-404a, R410A) which the ranges of diameters, mass fluxes and vapor qualities are 1.4 – 6.1 mm, 200 – 400 kg/m2.s, 0.1 – 0.9, respectively. These models are compared with 3 different methods which use mean absolute error (MAE), relative performance factor (RPF), and percentage of data which fall between ±30% errors bands to compare them. All methods give similar results and present the Müller-Steinhagen and Heck model as the most accuracy model in all.