Analisa Rugi Tekanan Fluida Refrigerant Dua Fasa Di Dalam Pipa Horizontal Menggunakan Program Komputasi Dinamika Fluida

Abstract

Two phase flow in a horizontal tube has widespread applications, particularly in the condensers of refrigeration and air conditioning systems. Pressure drop prediction is especially important for condensers because the local condensing temperature is a function of local pressure, affecting the mean temperature difference in the heat exchanger. In the present analysis, two phase flow is treated as a single phase pseudo fluid with average properties of liquid and vapor using homogeneous model. CFD analysis of two phase flow of refrigerants inside a smooth horizontal tube is carried out under adiabatic conditions using commercial CFD software, FLUENT for different mass fluxes are variety 400 – 750 kg/m2s at saturation temperatures of 40oC. Velocity profile at inlet pipe adjusts not uniform but parabolic profile shaped which is aimed by tool in software FLUENT called UDF (User Defined Function) The values of pressure drop obtained from the simulations for refrigerants, R134a, R236ea and R22 are compared with experimental data, simulation which has done before (by P. Bhramara et al.) and correlations and available in literature.