| Title |
An Assessment of Friction Factor and Viscosity Models for Predicting the Refrigerant Characteristics in Adiabatic Capillary Tubes |
| Authors |
손기동(Ki Dong Son) ; 박상구(Sang-goo Park) ; 정지환(Ji Hwan Jeong) ; 이승홍(Lee Sung Hong) ; 김윤수(Lyun Su Kim) |
| Keywords |
단열 모세관 ; 이상 냉매유동 ; 마찰계수 ; 이상 점성계수 ; 이상마찰승수 Adiabatic capillary tube ; Two-phase refrigerant flow ; Friction factor ; Two-phase viscosity model ; Two-phase frictional multiplier |
| Abstract |
Capillary tubes are widely used as expansion device in small refrigeration systems. The refrigerant flowing in the capillary tube experiences frictional and accelerational head losses and flashing simultaneously. In this paper flow characteristics of adiabatic capillary tubes were simulated with various friction factor models, two-phase viscosity models, and two-phase frictional multiplier models. The predicted pressure distribution and mass flow rate are compared with experimental data reported in literature. It is confirmed that the predicting accuracy with homogeneous model can be improved by employing suitable correlations of friction factor, two-phase viscosity and two-phase frictional multiplier. |