Heat transfer coefficient effects on spray cooling
- British Steel plc, Moorgate (United Kingdom)
- Spraying Systems Co., Wheaton, IL (United States)
SPRAY cooling has become an integral part of the steel industry. Applications include secondary cooling of continuous casting strands, roll cooling and plate cooling. Manufacturers offer many types of spray nozzles including both hydraulic and air mist. Knowledge of heat removal performance of these sprays is vital in making the correct choice and the use of mathematical modeling of cooling demands a precise understanding of the capability of the nozzle. The methods of nozzle testing, including the determination of heat removal characteristics are presented and discussed in this article. A test apparatus, using a stainless steel specimen cooled from 1,200 C to ambient, has been used to investigate the heat transfer coefficients (HTCs) from various types of spray, both pressure atomized and air mist. It is a transient method with the temperature history being supplied to a mathematical model. The model is iterative but with a convergence function which gives the relationship between HTC and stock temperature over the entire temperature range. Relationships between impact density and HTC are presented for various nozzles.
- OSTI ID:
- 276705
- Journal Information:
- Iron and Steel Engineer, Vol. 73, Issue 7; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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