Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Comparison of Mixing Characteristic in Bottom Blowing Ladle, LD Converter and RH Degassing Process
Yoshio WATANABEJi-Cheng HEShigeo ASAIIwao MUCHI
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1983 Volume 69 Issue 9 Pages 1160-1166

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Abstract

The theoretical correlation between mixing time (τ) and mixing power density (ε) which was presented in the previous work is confirmed through water model experiments for bottom blowing ladle, LD converter and RH degassing process. In the flow controled predominately by inertia force or turbulent viscous force, τ is proportional to ε-1/3Lγ in the three vessels where the power (γ) to vessel size (L) depends on the vessel type. The value of γ reflects the turbulent structure of agitated liquid and it is an essential factor for scale-up. Thus, the precise information of turbulence, i. e., the velocity variation is measured by a hot-wire anemometer and a spectral analysis of the velocity fluctuation is computed by the method of FFT (Fast Fourier Transform). The dissipation energy of turbulence (ε') can be evaluated from the information of the spectral analysis. A correlation between τ and ε' is presented in a unified foshion without regard to the kind of vessels.

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© The Iron and Steel Institute of Japan
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