HEAT TRANSFER AND CRITICAL CONDITIONS IN NUCLEATE BOILING OF SUBCOOLED AND FLOWING LIQUIDS

Technical Report · Thu Dec 31 23:00:00 EST 1959

OSTI ID:4136051

Chang, Y

The heat transfer and the critical conditions in boiling of subcooled liquids with forced convection are considered. Both ordinary liquids (100> Pr> 0.5) and liquid metals (Pr < 0.1) are considered as the heat transfer media. By introducing an equivalent thermal diffusivity, a general equation is obtained, valid from simple forced convection to the critical heat flux of nucleate boiling. When the condition approaches that of critical heat flux, the latent heat transport becomes significant. Through the application again of an equivalent thermal diffusivity and of a wave concept, the critical heat flux is determined. Comparing the result with that obtained from the mechanism of bubble agitation yields the critical superheat. Since the critical heat flux is considered as a problem of hydrodynamic stability and is investigated with respect to the local conditions, it does not depend on the orientation, the form and the dimension of the heater, but depends only on the subcooling, the velocity of flow, and the properties of the liquid. Pressure affects the values of the physical properties and, therefore, does not appear as a parameter. (auth)

• Research Organization: University of Notre Dame, Notre Dame, Ind.
• NSA Number: NSA-14-016758
• OSTI ID: 4136051
• Report Number(s): TID-6045
• Country of Publication: United States
• Language: English

Related Subjects

BOILING
BUBBLES
BURNOUT
CONFIGURATION
CONVECTION
COOLING
ENGINEERING AND EQUIPMENT
FORCED CONVECTION
HEAT EXCHANGERS
HEAT FLOW
HEAT TRANSFER
HYDRAULICS
LIQUID FLOW
LIQUID METALS
LIQUIDS
MATHEMATICS
NUCLEATE BOILING
PRESSURE
STABILITY
SUBCOOLING
THERMAL DIFFUSION
THERMODYNAMICS
VELOCITY
WAVE MECHANICS