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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
APPLICATION OF THE DRIFT FLUX MODEL IN A TWO-PHASE REFRIGERANT FLOW THROUGH CAPILLARY TUBE
Submission Author:
Mariana Barbosa , SP
Co-Authors:
Ricardo Augusto Mazza
Presenter: Mariana Barbosa
doi://10.26678/ABCM.ENCIT2016.CIT2016-0076
Abstract
A drift flux model has been used to study the two-phase flow during vaporization of halogenated refrigerants (R12 and R134a) through an adiabatic capillary tube, which is employed as expansion devices in small sized refrigeration systems. The capillary tube has an internal diameter in the range from 0.66 up to 1.17 mm and the inlet pressure varying from 0.8 to 1.4 MPa. The flow is considered as one-dimensional, stationary and thermodynamic equilibrium between liquid and vapor phases is assumed. The model applies a flow pattern independent void fraction correlation and was validated against experimental pressure drop data found in literature. The generation of vapor induce a flow pattern change, which is presented. A comparison of the results of drift flux and two-fluid model shows a good agreement to pressure distribution, void fraction, quality and phases velocities.
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