Pool boiling critical heat flux on a horizontal cylinder in subcooled water for wide ranges of subcooling and pressure and its mechanism
- Kyoto Univ., Uji, Kyoto (Japan). Inst. of Atomic Energy
- Kobe Univ. of Mercantile Marine, Kobe, Hyogo (Japan)
The correct understanding of the cooling limits of high heat fluxes encountered in many important engineering and scientific systems especially in plasma-facing components in fusion reactors becomes necessary; many experimental investigations for highly subcooled flow boiling of water were carried out at fusion reactor coolant conditions recently. On the other hand, though the critical heat fluxes in a pool of water up to high subcoolings and pressures are important as the fundamental database to understand those at zero velocity of water, no systematic studies on the critical heat fluxes in pool boiling of water for wide ranges of subcooling and pressure exist till quite recently. The authors carried out the experimental studies as a part of transient boiling for high subcoolings at high pressures in water due to quasi-steadily increasing heat inputs recently. They suggested that there exist two different mechanisms for heat transfer crisis at critical heat flux for low and high subcooled regions for water. The objective of present research is to clarify as the extension of the previous research the effects of the test heater shapes in water, and of the kinds of liquids such as He I, and ethanol on the critical heat fluxes for wide ranges of subcoolings and pressures which are due to the different two mechanisms. The effect of water velocities under forced convection condition on the critical heat fluxes under the conditions of high subcoolings at high pressures will appear elsewhere in the near future.
- OSTI ID:
- 428066
- Report Number(s):
- CONF-960815--; ISBN 0-7918-1508-0
- Country of Publication:
- United States
- Language:
- English
Similar Records
Subcooled water flow boiling at 1. 66 MPa under uniform high heat flux conditions
Transient pool boiling heat transfer due to increasing heat inputs in subcooled water at high pressures