Local heat transfer for subcooled flow boiling with water
- Prairie View A and M Univ., Mechanical Engineering Dept., Prairie View, TX (United States)
In this paper, local heat transfer coefficients are predicted for turbulent water subcooled flow boiling through uniformly heated circular tubes. Correlations by Petukhov and by Shah are modified slightly. however, the correlation suggested by Kandlikar is improved significantly by requiring that it approach more accurate limits near the onset of fully developed boiling and the onset of nucleate boiling for subcooled flow. Excellent agreement is obtained with data corresponding to conditions of high inlet subcooling (183[degrees]C), high mass velocity (4.4 to 31.5 Mg/m[sup 2][center dot]s), and a large ratio of the axial coordinate to the diameter (95.5). The exit subcooling varies from 53.0 to 81.5[degrees]C. For smaller ratios ([lt]50.0), the accuracy decreases. In all cases, the local film temperature is the characteristic temperature. When the associated critical heat flux (CHF) data are examined in a Stanton number-Peclet number space, St [lt] 0.0065 and Pe [gt] 10[sup 5] in all cases. Comparisons with the Saha-Zuber criterion for bubble detachment show that moderately subcooled and high-velocity flows re characterized by a multiboundary layer phenomenon that includes an attached bubble layer. These results show that the bubble layer's existence can now be documented for a wide variety of fluids and conditions without flow visualizations.
- OSTI ID:
- 7186149
- Journal Information:
- Fusion Technology; (United States), Vol. 22:4; ISSN 0748-1896
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
SUBCOOLED BOILING
HEAT TRANSFER
CIRCULAR CONFIGURATION
CRITICAL HEAT FLUX
NUCLEATE BOILING
TEMPERATURE RANGE 0400-1000 K
TUBES
TURBULENT FLOW
WATER
BOILING
CONFIGURATION
ENERGY TRANSFER
FLUID FLOW
HEAT FLUX
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
TEMPERATURE RANGE
420400* - Engineering- Heat Transfer & Fluid Flow
700420 - Fusion Technology- Plasma-Facing Components- (1992-)