Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Heat Transfer Coefficients in the Surface Temperature Range of 400 to 800°C during Water-spray Cooling of Hot Steel Product
Masashi MITSUTSUKA
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1983 Volume 69 Issue 2 Pages 268-274

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Abstract

Heat transfer coefficients (α) of water-spray cooling in the region of steel surface temperature (θs) 400 to 800°C are numerically expressed as a function of θs and impinged water flux (W), by using published water-spray cooling data (7 papers, 112 data) measured with scale-coated steel specimens by many researchers. In the region of θs : 400 to 800°C and W: 10 to 2 000 l/m2 · min, αw is represented by the following equation,
αw=2.292 × 108 · W0.616θs 2.445
where αw is value of α without radiation heat transfer, [αw] being kcal/m2· h ·°C.
In addition, are discussed features of exponents of W and θs, comparison of the above equation with other researchers' one, α in the film boiling region, and α calculation methods for θs between 125°Cand about 1 200°C.

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© The Iron and Steel Institute of Japan
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