Investigation on the Surface Vortex Formation During Mechanical Stirring with an Axial-Flow Impeller Used in an Aluminum Process

被引：15
|
作者：
Yamamoto, Takuya [1 ]
Kato, Wataru [1 ]
Komarov, Sergey, V [1 ]
Ishiwata, Yasuo [2 ]
机构：
[1] Tohoku Univ, Grad Sch Environm Studies, Sendai, Miyagi 9808579, Japan
[2] Nippon Light Met Co Ltd, Shizuoka 4213297, Japan
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2019年 / 50卷 / 06期
关键词：
FLUID-FLOW; COMPUTER-SIMULATION; DEGASSING LADLE; MODEL; GAS;
D O I：
10.1007/s11663-019-01681-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The present study investigated the mechanism of surface vortex formation in an aluminum melt vessel stirred by an axial-flow impeller mechanically. The oxide film is formed at the aluminum melt/air interface, and the movement of the interface entrains the oxide film and inclusions. Hence, the transient movement of melt-air interface is significant. The present study conducted a water model experiment and numerical simulation focusing on the movement of gas-liquid interface. The present study found that the oxide film can be entrained by two phenomena: (1) local surface vortex and (2) sloshing near the vessel wall. The local surface vortex is formed due to the pressure distribution around the impeller, and the sloshing is caused by macroinstabilities, which is generated by the discharged flow of axial-flow impeller. Besides, the shape of gas-liquid interface is dependent on the impeller shape. The axial-flow impeller gives rise to steeply curved shape of gas-liquid interface near the impeller shaft. (C) The Minerals, Metals & Materials Society and ASM International 2019
引用
收藏
页码：2547 / 2556
页数：10
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