Local pressure gradients due to incipience of boiling in subcooled flows

Technical Report · Fri Sep 01 04:00:00 EDT 1995

DOI:https://doi.org/10.2172/106988· OSTI ID:106988

Ruggles, A. E.; McDuffee, J. L. ^[1]

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1. Univ. of Tennessee, Knoxville, TN (United States)

Models for vapor bubble behavior and nucleation site density during subcooled boiling are integrated with boundary layer theory in order to predict the local pressure gradient and heat transfer coefficient. Models for bubble growth rate and bubble departure diameter are used to scale the movement of displaced liquid in the laminar sublayer. An added shear stress, analogous to a turbulent shear stress, is derived by considering the liquid movement normal to the heated surface. The resulting mechanistic model has plausible functional dependence on wall superheat, mass flow, and heat flux and agrees well with data available in the literature.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (United States). Div. of Systems Technology; American Nuclear Society, La Grange Park, IL (United States); American Inst. of Chemical Engineers, New York, NY (United States); American Society of Mechanical Engineers, New York, NY (United States); Canadian Nuclear Society, Toronto, ON (Canada); Japan Society of Multiphase Flow, Kyoto (Japan)
• OSTI ID: 106988
• Report Number(s): NUREG/CP--0142-Vol.1; CONF-950904--Vol.1; ON: TI95017077
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
42 ENGINEERING
BUBBLE GROWTH
COOLANTS
FLOW MODELS
FORECASTING
HEAT TRANSFER
HYDRAULICS
NUCLEATION
PRESSURE GRADIENTS
REACTOR SAFETY
SUBCOOLED BOILING
THEORETICAL DATA