Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Fundamental Analysis of Heat Transfer in Steel Scrap Preheating under Radiative and Convective Conditions
Tao WANGMasahiro KAWAKAMIKenichiro MORI
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2002 Volume 88 Issue 12 Pages 831-837

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Abstract

Heat transfer in a preheating process of steel scraps was analyzed by taking convection combined with radiation into consideration. The analysis of simultaneous heat transfer has been carried out by experimental and mathematical methods. To examine the accuracy of calculation, the experiment was carried out in He, N2 and Ar atmosphere under reduced, ambient and high pressure. The commercial FEM software ANSYS was used for simulation. The simulated results agreed well to the experimental ones with the specimen surface emissivities of 0.4. The convective heat transfer coefficient was estimated. The coefficient increased with increase in pressure and with decrease in temperature. The ratio of heat quantity between overall and convective heat -Ψ, is varied with the crucible temperature, and can be expressed by the following correlation:Ψ=βeγT. The heat transfer coefficient can be summarized in the following dimensionless correlation:
Nuξ=2.62 Reξ0.15

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