HYDRODYNAMIC STUDY OF BURN-OUT IN BOILING. Report No. 17
Technical Report
·
OSTI ID:4052346
S>The burn-out mechanism, by which a heating surface is melted down in the high-heat flux as the heat transfer coefficient is suddenly decreased, is investigated on the basis of hydrodynamic aspects. A completely vaporized area is created, when bubbles in boiling grow from the nucleates of bubbles on the heating surface, the bubbles are detached from the surface, and the growth of the bubbles ends. A fluid-flow resistance between the fluids occur, when the vapor rises in the area and the liquid of the same flow-rate with that of the vapor comes down. When the force, necessary to overcome the fluid-flow resistance, is not given to the fluids, there will be a limit to the flow rate. A semitheoretical analysis was made in pool-boiling. An experiment was made on the counter flow between air and water. In consequence, it was recognized that there are limits in the flow rate and that the calculated limit values would be the same with the heat-flux in burn-out. In forced-circulation boiling, a semi- theoretical analysis was made and the equation of the maximum heat flux, q/sub B// sub -//sub O//sub -/= u/sub m/ gamma p( lambda /8)(l-A /sub v/), was obtained, under the assumption that burn-out mostly occurs when the flow-rate of the liquid coming to the heating surfaces is less than that of the vapor going out of the surface when forced circulation in boiling makes a kind of turbulent diffusion. Maximum heat-flux equations for various conditions of the flow and heating surface were introduced, and were found in good agreement with the data of many experiments on the forced-circulation boiling of water. (auth)
- Research Organization:
- Japan Atomic Energy Research Inst., Tokyo
- NSA Number:
- NSA-15-020826
- OSTI ID:
- 4052346
- Report Number(s):
- JAERI-1017
- Country of Publication:
- Japan
- Language:
- English
Similar Records
On the dual nature of nucleate boiling crisis on porous surfaces
INVESTIGATION OF LIQUID METAL BOILING HEAT TRANSFER. Quarterly Progress Report No. 3
NOTES ON THE LIQUID-METAL BOILING PHENOMENON
Book
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:418147
INVESTIGATION OF LIQUID METAL BOILING HEAT TRANSFER. Quarterly Progress Report No. 3
Technical Report
·
Sun Jul 01 00:00:00 EDT 1962
·
OSTI ID:4722391
NOTES ON THE LIQUID-METAL BOILING PHENOMENON
Technical Report
·
Wed Jul 10 00:00:00 EDT 1963
·
OSTI ID:4630817