Two-phase flow in minichannels is widely present in evaporators and condensers, such as, for example, air-cooled condensers for automotive and air-conditioning applications. It is crucial to have reliable pressure drop prediction methods for two-phase heat transfer modeling and optimization because pressure drop have a strong influence on the two-phase heat transfer. In this work, a model to calculate the frictional pressure gradient during two-phase flow in small diameter channels is presented: it accounts for the effects of surface roughness on the internal surface. Predictions by the present model are compared against a new two-phase pressure drop database to enlarge its validity range. The new pressure drop database is obtained from experimental tests with refrigerants R290 (propane), R1234ze(E), and two mixtures R32/R1234ze(E) (23/77% and 50/50% by mass composition) at mass flux ranging between 200 and 800 kg m-2 s-1.

A prediction method of frictional pressure drop during two-phase flow in small diameter channels

DEL COL, DAVIDE;AZZOLIN, MARCO;BISETTO, ALBERTO;BORTOLIN, STEFANO
2014

Abstract

Two-phase flow in minichannels is widely present in evaporators and condensers, such as, for example, air-cooled condensers for automotive and air-conditioning applications. It is crucial to have reliable pressure drop prediction methods for two-phase heat transfer modeling and optimization because pressure drop have a strong influence on the two-phase heat transfer. In this work, a model to calculate the frictional pressure gradient during two-phase flow in small diameter channels is presented: it accounts for the effects of surface roughness on the internal surface. Predictions by the present model are compared against a new two-phase pressure drop database to enlarge its validity range. The new pressure drop database is obtained from experimental tests with refrigerants R290 (propane), R1234ze(E), and two mixtures R32/R1234ze(E) (23/77% and 50/50% by mass composition) at mass flux ranging between 200 and 800 kg m-2 s-1.
2014
13th International Conference on Multiphase Flow in Industrial Plants
13th International Conference on Multiphase Flow in Industrial Plants
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3035361
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