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ACRC Technical Report 25PDF


Title:Pressure Drop During Two-Phase Flow of Refrigerants in Horizontal Smooth Tubes
Author(s):Souza, A.L.; Chato, J.C.; Jabardo, J.M.S.; Wattelet, J.P.; Panek, J.S.; Christoffersen, B.R.; Rhines, N.
Subject(s):refrigerant-side evaporation condensation studies
Abstract:A single tube evaporator test facility capable of measuring pressure drop and heat transfer coefficients inside horizontal tubes has been designed and developed at the Air Conditioning and Refrigeration Center at the Univ~ity of illinois. Baseline testing with R-12 and testing with R- 134a, an ozone-safe refrigerant, have been completed. Tests were conducted using pure refrigerants and refrigerant-oil mixtures. For the refrigerant-oil testing, PAG and Ester oils were added to R-134a and mineral oils were added to R-12 with the oil concentration varying from 0 to 5% by weight. The observed flow regimes were predominantly annular. A new correlation for two-phase frictional pressure drop inside smooth tubes was developed for pure refrigerants using the Lockhart-Martinelli parameter "Xtt" and Eroude number "EI'J.". The two dimensionless parameters predicted the-data well within the range of parameters considered in this study. In addition, a functional dependence between the ratio of the pressure drops with and without oil and the oil concentration "0)" was developed.
Issue Date:1992-10
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-25
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Center Project 01
Date Available in IDEALS:2009-03-13

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