Numerical simulation of gas-contaminated refrigerant two-phase flow through

0346592 - ÚT 2011 RIV US eng J - Journal Article
Vinš, Václav - Hrubý, Jan - Vacek, V.
Numerical simulation of gas-contaminated refrigerant two-phase flow through.
International Journal of Heat and Mass Transfer. Roč. 53, 23-24 (2010), s. 5430-5439. ISSN 0017-9310. E-ISSN 1879-2189
R&D Projects: GA ČR GA101/09/1633
Institutional research plan: CEZ:AV0Z20760514
Keywords : capillary tube * henry’s law * non-condensing gases
Subject RIV: BJ - Thermodynamics
Impact factor: 1.898, year: 2010
http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V3H-50N9C3K-8-2X&_cdi=5731&_user=640952&_pii=S0017931010003819&_origin=search&_coverDate=11%2F30%2F2010&_sk=999469976&view=c&wchp=dGLzVtz-zSkWA&md5=3b8d5c97caaa70e52da990c8ffac4421&ie=/sdarticle.pdf

An unfavorable effect of gas impurities on the throttling process inside a capillary tube has been studied. A special testing capillary tube has been used for an experimental investigation of the capillary flow of a fluorocarbon refrigerant R218 contaminated by nitrogen. The gas impurities significantly affected the throttling process, since the two-phase flow started notably earlier than in the case of pure refrigerant flow. Moreover, the gas contamination resulted in a decreased mass flow rate. A comprehensive numerical model has been developed to simulate the capillary flow of gas-contaminated refrigerant. The model takes into account two coincident thermodynamic events: the throttling process of the refrigerant and the gradual release of the dissolved gas impurities from the refrigerant liquid phase. The model considers adiabatic, thermodynamically equilibrated capillary flow with homogeneous two-phase flow. The numerical simulation is in good agreement with our experimental data.
Permanent Link: http://hdl.handle.net/11104/0187582