Boiling heat transfer and dryout in restricted annular geometries
Conference
·
· AIChE Symp. Ser.; (United States)
OSTI ID:6375620
- Iowa State Univ., Ames
Described is an experimental investigation to determine the pool boiling heat transfer characteristics and critical heat flux (CHF) when fluid flow to a heater surface is restricted. The geometries studied were simulated tube-baffle assemblies such as those encountered in shell-and-tube steam generators and reboilers. Data were obtained for tube-baffle clearances as small as 0.076 mm, with water as the working fluid. Increases (up to about 230%) in the convective heat transfer coefficient within the restricted area are attributed to thin film evaporation. Decreases in CHF, compared to an unrestricted tube, of up to a factor of 10 were observed. The CHF was determined to be directly proportional to clearance and inversely proportional to baffle width. A correlation is presented which satisfactorily represents the present data and Freon-113 data of another investigation.
- OSTI ID:
- 6375620
- Report Number(s):
- CONF-760816-
- Conference Information:
- Journal Name: AIChE Symp. Ser.; (United States) Journal Volume: 73:164
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ANNULAR SPACE
BOILERS
BOILING
CONFIGURATION
CRITICAL HEAT FLUX
DRYOUT
FLUID FLOW
HEAT FLUX
HYDROGEN COMPOUNDS
MEASURING METHODS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POOL BOILING
STEAM GENERATORS
TUBES
TWO-PHASE FLOW
VAPOR GENERATORS
WATER
420400* -- Engineering-- Heat Transfer & Fluid Flow
ANNULAR SPACE
BOILERS
BOILING
CONFIGURATION
CRITICAL HEAT FLUX
DRYOUT
FLUID FLOW
HEAT FLUX
HYDROGEN COMPOUNDS
MEASURING METHODS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POOL BOILING
STEAM GENERATORS
TUBES
TWO-PHASE FLOW
VAPOR GENERATORS
WATER