variavel0=<b>FLÁVIO AUGUSTO S. FIORELLI</b> - fiorelli@usp.br USP
<b>OTÁVIO M. SILVARES</b> - otavioms@maua.br USP / E.E. MAUÁ
<b>Abstract.</b> This paper presents the experimental validation of a simulation model for refrigerant mixtures flow through capillary tubes. To perform such validation it was built an experimental apparatus using a blow-down process. It was carried out preliminary tests for characterization of experimental parameters: actual capillary tube diameters; relative roughness; and the heat losses in subcooling/quality control system. It was obtained almost 200 experimental points for R-407C (a zeotropic mixture) and R-410A (a near azeotropic mixture). Complete data set for each point consists of the measured pressure and temperature profiles, mass flow rate and mixture composition, as well as subcooling/quality control system inlet and outlet temperatures and heater electric power consumption for tests with two-phase flow capillary tube inlet conditions. Comparison of simulation and experimental data show a good agreement. Main deviations are connected with the delay of vaporization phenomenon occurrence, experimentally verified by the authors.
<b>Keywords.</b> Capillary tubes, Refrigerant mixtures flow, Modelling, Simulation.