Cooling Characteristics and Heat Transfer Coefficients during Fog Cooling of Hot Steel Plates
| Autor: | Masashi Mitsutsuka, Keiji Fukuda |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Air cooling
Materials science Chemistry Metallurgy Metals and Alloys General Engineering Thermodynamics Free cooling Heat transfer coefficient Condensed Matter Physics Cooling capacity Forced air cooling Cooling rate Flux (metallurgy) Heat flux Heat transfer Materials Chemistry Steel plates Physical and Theoretical Chemistry Composite material |
| Zdroj: | Transactions of the Iron and Steel Institute of Japan. 21:689-698 |
| ISSN: | 1881-1183 0021-1583 |
| DOI: | 10.2355/isijinternational1966.21.689 |
| Popis: | Air-atomized fog cooling is suitable for the forced cooling of hot steel products, particularly in the soft cooling region where the cooling rate is between those of forced air cooling and water-spray cooling. In fog cooling, both water and air are considered to effect the cooling. It is well known that when fog impinges against the surface being cooled at high speed, the heat flux transferred from the surface to the fog increases with increases in fog impinging speed because of unstable vapor films on the surface. It has not yet been clarified whether or not the heat flux increases when fog impinges against the surface at lower speeds.The heat transfer phenomena have been studied when hot steel specimens are cooled with fog atomized by low-speed air. The major results obtained are as follows:(1) When fog impinges against the surface at a low speed, the air functions mainly to atomize water, and hardly contributes to heat transfer.(2) The cooling capacity of fog is solely dependent on the water flux being impinged onto the surface.(3) The cooling capacity of air-atomized fog is nearly equal to that of pressure-atomized fog insofar as water flux is the same.In this paper, in addition to the above results, the differences in heat transfer mechanism between the upper and lower surfaces of a horizontally placed steel plate and the influences of surface conditions of a steel plate on heat transfer are discussed. |
| Databáze: | OpenAIRE |
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