TY - JOUR
T1 - Adiabatic two-phase pressure drop of refrigerants in small channels
AU - Field, Brandon S.
AU - Hrnjak, Pega
N1 - Funding Information:
The present work has been performed as part of the Air Conditioning and Refrigeration Center at the University of Illinois at Urbana Champaign. The surface characterization of the channels was carried out in the Center for Microanalysis of Materials, University of Illinois, which is partially supported by the U.S. Department of Energy under grant DEFG02-91-ER45439.
PY - 2007/8
Y1 - 2007/8
N2 - The adiabatic pressure drop of two-phase refrigerant flow in small channels has been investigated. A rectangular channel with dh = 148.0 m has been tested with four refrigerants: R134a, R410A, propane (R290), and ammonia (R717). These data have been combined with data taken from five different channels, with dh varying from 70 m to 305 m, of R134a. The measured pressure drops have been compared to many published separated-flow and homogeneous pressure drop models. A new correlation for C, the Chisholm parameter, has been developed based on the Reynolds number of the vapor phase (which contains the majority of the kinetic energy) and the dimensionless grouping - a ratio of viscous to surface tension effects taken from the analysis of capillary flow performed by Sou and Griffith (1964). This allows the new correlation to account for the varying fluid properties (including surface tension) that are found in the different refrigerants. The new correlation takes flow regime into account by means of a Weber number based flow transition criteria, following the flow map of Akbar et al. (2003).
AB - The adiabatic pressure drop of two-phase refrigerant flow in small channels has been investigated. A rectangular channel with dh = 148.0 m has been tested with four refrigerants: R134a, R410A, propane (R290), and ammonia (R717). These data have been combined with data taken from five different channels, with dh varying from 70 m to 305 m, of R134a. The measured pressure drops have been compared to many published separated-flow and homogeneous pressure drop models. A new correlation for C, the Chisholm parameter, has been developed based on the Reynolds number of the vapor phase (which contains the majority of the kinetic energy) and the dimensionless grouping - a ratio of viscous to surface tension effects taken from the analysis of capillary flow performed by Sou and Griffith (1964). This allows the new correlation to account for the varying fluid properties (including surface tension) that are found in the different refrigerants. The new correlation takes flow regime into account by means of a Weber number based flow transition criteria, following the flow map of Akbar et al. (2003).
UR - http://www.scopus.com/inward/record.url?scp=34250180184&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34250180184&partnerID=8YFLogxK
U2 - 10.1080/01457630701326456
DO - 10.1080/01457630701326456
M3 - Article
AN - SCOPUS:34250180184
SN - 0145-7632
VL - 28
SP - 704
EP - 712
JO - Heat Transfer Engineering
JF - Heat Transfer Engineering
IS - 8-9
ER -