Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 10    October 2021

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3D numerical investigation of effects of density and surface tension on mixing time in bottom-blown gas-stirred ladles
Matin GHADIMI REZAEI1, Pooyan HASHEMI TARI1, Mohammad EMAMZADEH1, Leili TAFAGHODI KHAJAVI2

1. Mechanical Engineering Department, Shahid Beheshti University, Tehran, 16589-53571, Iran;
2. Material Science and Engineering Department, McMaster University, Hamilton L8S 4L7, Canada

Abstract:In molten phase metallurgical processes, mixing via gas injection has a vital role in obtaining a homogeneous product. The efficiency of mixing depends on operational variables such as gas flow rate and slag height as well as physical properties of the molten phases. A numerical simulation is conducted to study the above parameters in the flow behavior of a bottom-blown bath. The molten metal and the slag are modeled by water and oil, respectively. The numerical results, particularly the mixing time, are validated against experimental data. The results show that mixing time increases as the slag height increases and decreases as the density of the slag material increases. The mixing time decreases with an increase in the density of the primary phase; however, it increases as the surface tension between air and water increases. A case with properties close to a real molten metal is also modeled. The performance of the system is influenced by the momentum rather than the dissipative forces. Thus, the effect of the density of the molten phase on the mixing process is more pronounced compared to the effect of the surface tension between the air and the molten phase.

 

Key words: gas-stirred ladle; mixing time; density; surface tension; tracer concentration; numerical simulation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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