An experimental investigation of pressure drop in forced-convection condensation and evaporation of oil-refrigerant mixtures
Experimental measurements of pressure drop have been made for forced-convection evaporation and condensation of oil-refrigerant (R-12) mixtures inside a horizontal tube. Data were compared to a wide range of frictional pressure drop and void fraction relationships. The best representations for the oil-free data were then modified to better correlate both oil-free and oil-refrigerant results. For condensation, a modification of the prediction given by the Lockhart-Martinelli relation for frictional pressure drop and the homogeneous void fraction model is presented. For evaporation, the prediction given by the Dukler II frictional pressure-drop correlation and the homogeneous void fraction is modified. These relationships predict the pressure drop for 85% of the data to within +- 35%. The added oil increased the pressure drop 2% to 6% for condensation and 63% to 86% for evaporation.
- Research Organization:
- Dept. of Mechanical Engineering, Rensselaer Polytechnic Institute, Troy, NY (US)
- OSTI ID:
- 6956422
- Report Number(s):
- CONF-8606125-
- Journal Information:
- ASHRAE Trans.; (United States), Vol. 92:2A; Conference: ASHRAE annual meeting, Portland, OR, USA, 22 Jun 1986; Other Information: Technical Paper 3004 (RP-221)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
PETROLEUM PRODUCTS
EVAPORATION
REFRIGERANTS
COOLING SYSTEMS
FORCED CONVECTION
HEAT EXCHANGERS
HEAT TRANSFER
MATHEMATICAL MODELS
PHYSICAL PROPERTIES
PRESSURE DROP
THERMODYNAMICS
VOID FRACTION
CONVECTION
ENERGY SYSTEMS
ENERGY TRANSFER
FLUIDS
MASS TRANSFER
PHASE TRANSFORMATIONS
WORKING FLUIDS
400201* - Chemical & Physicochemical Properties
320106 - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)