The effect of oil contamination on the nucleate pool-boiling performance of R-114 from a porous-coated surface
Conference
·
· ASHRAE Trans.; (United States)
OSTI ID:6515762
The external, nucleate pool-boiling heat-transfer coefficient in R-114 with up to 10% oil (by mass) was measured on a smooth copper tube and on a porous-coated copper-nickel tube. The heat flux was varied from 160 to 30,000 Btu/hr . ft/sup 2/ (0.5 to 95 kW/m/sup 2/) at boiling temperatures of 28 F and 44 F (-2.2/sup 0/C and 6.7/sup 0/C). The porous-coated surface was found to improve the heat-transfer coefficient over the smooth surface by a factor of 7 to 10 in oil-free R-114. The presence of up to 3% oil caused about a 35% reduction in the heat-transfer coefficient of the porous-coated surface at all heat fluxes. With 6% or more oil, the boiling performance of this surface declined drastically at heat fluxes in excess of 9500 Btu/hr . ft/sup 2/ (30 kW/m/sup 2/). Some plausible mechanisms to explain the observed behavior are described.
- Research Organization:
- Dept. of Mechanical Engineering, Naval Postgraduate School
- OSTI ID:
- 6515762
- Report Number(s):
- CONF-8606125-
- Conference Information:
- Journal Name: ASHRAE Trans.; (United States) Journal Volume: 92:2B
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
BOILING
BOILING POINTS
CHEMICAL COMPOSITION
COATINGS
COPPER
ELEMENTS
ENERGY SOURCES
ENERGY SYSTEMS
ENERGY TRANSFER
FLUIDS
FOSSIL FUELS
FUELS
HEAT FLUX
HEAT TRANSFER
MATERIALS
MEDIUM TEMPERATURE
METALS
NICKEL
NUCLEATE BOILING
PERFORMANCE
PETROLEUM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POOL BOILING
POROUS MATERIALS
REFRIGERANTS
SPACE HVAC SYSTEMS
SURFACES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
WORKING FLUIDS
320106* -- Energy Conservation
Consumption
& Utilization-- Building Equipment-- (1987-)
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
BOILING
BOILING POINTS
CHEMICAL COMPOSITION
COATINGS
COPPER
ELEMENTS
ENERGY SOURCES
ENERGY SYSTEMS
ENERGY TRANSFER
FLUIDS
FOSSIL FUELS
FUELS
HEAT FLUX
HEAT TRANSFER
MATERIALS
MEDIUM TEMPERATURE
METALS
NICKEL
NUCLEATE BOILING
PERFORMANCE
PETROLEUM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POOL BOILING
POROUS MATERIALS
REFRIGERANTS
SPACE HVAC SYSTEMS
SURFACES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
WORKING FLUIDS