The effect of a coating material on mist cooling of hot metals
- Hiroshima Univ., Higashi-Hiroshima, Hiroshima (Japan). Dept. of Mechanical Engineering
- NSK Ltd., Ishibe, Shiga (Japan). Ishibe Works
The accurate knowledge of mist cooling characteristics is important for analyzing emergency cooling system under loss-of-coolant-accident conditions. Heat transfer characteristics of mist cooling are affected by many factors (Carbajo, 1985). Attention should be given to the effect of thermal conductance of surface materials on the cooling process of used fuels whose surfaces are oxided or contaminated by some impurities in the coolant. This paper deals with transient boiling heat transfer to mist flow of air-water mixture from hot metals coated with a thin layer of insulating (low thermal conductivity) material. The test specimens selected for the present experiment are silver and stainless steel disks whose heat transfer surface is coated with a refractory paint. The heated disk is plunged vertically into the mist flow and is cooled down to the saturation temperature of water under atmospheric pressure. The coating produces a great enhancement in heat transfer, especially in transition and film boiling regions. This enhancement becomes higher with increasing coating thickness. Heat transfer is more enhanced as mass velocity of water increases although it has a weak dependency on linear velocity of air.
- OSTI ID:
- 271933
- Report Number(s):
- CONF-960306-; ISBN 0-7918-1226-X; TRN: 96:017241
- Resource Relation:
- Conference: ICONE 4: ASME/JSME international conference on nuclear engineering, New Orleans, LA (United States), 10-13 Mar 1996; Other Information: PBD: 1996; Related Information: Is Part Of ICONE-4: Proceedings. Volume 1 -- Part B: Basic technological advances; Rao, A.S. [ed.] [General Electric Nuclear Energy, San Jose, CA (United States)]; Duffey, R.B. [ed.] [Brookhaven National Lab., Upton, NY (United States)]; Elias, D. [ed.] [Commonwealth Edison, Downers Grove, IL (United States)]; PB: 564 p.
- Country of Publication:
- United States
- Language:
- English
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