Materials Transactions Online

Materials Transactions, Vol.51 No.09 (2010) pp.1560-1565
© 2010 The Japan Institute of Metals

Swirl Motions Caused by Horizontal Gas Injection with an L-Shaped Lance

Youhei Nasukawa1, Tosihide Fujikawa1, Ryoji Tsujino2 and Manabu Iguchi1

1Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
2Department of Mechanical Engineering, Faculty of Engineering, Setsunan University, Neyagawa 572-8508, Japan

Experimental investigations are carried out on the bath surface oscillations caused by horizontal air injection through an L-shaped lance into a cylindrical bath. Several types of bath surface oscillations are observed depending on the gas flow rate, the lance exit location, and so on. A bath surface oscillation map is drawn to identify the occurrence conditions of the oscillations. Particular attention is paid to the deep-water wave type swirl motion because of its practical importance. Empirical equations are newly proposed to describe the occurrence condition of the swirl motion. The measured values of the period and amplitude of the swirl motion compare favorably with their respective empirical equations proposed previously for bottom gas injection.

(Received 2010/4/13; Accepted 2010/6/14; Published 2010/7/28)

Keywords: gas injection, bubbling jet, swirl motion, steelmaking, refining, desulphurization, gas-liquid two-phase flow

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