Computational fluid dynamics simulation of gas-liquid two phases flow in 320 m3 air-blowing mechanical flotation cell using different turbulence models
来源期刊：中南大学学报(英文版)2015年第6期
论文作者：SHEN Zheng-chang CHEN Jian-hua ZHANG Chen-hu LIAO Xing-jin LI Yu-qiong
文章页码：2385 - 2392
Key words：computational fluid dynamics (CFD) simulation; flotation cell; gas-liquid two-phases flow
Abstract: According to the recently developed single-trough floating machine with the world’s largest volume (inflatable mechanical agitation flotation machine with volume of 320 m3) in China, the gas-fluid two-phase flow in flotation cell was simulated using computational fluid dynamics method. It is shown that hexahedral mesh scheme is more suitable for the complex structure of the flotation cell than tetrahedral mesh scheme, and a mesh quality ranging from 0.7 to 1.0 is obtained. Comparative studies of the standard k-ε, k-ω and realizable k-ε turbulence models were carried out. It is indicated that the standard k-ε turbulence model could give a result relatively close to the practice and the liquid phase flow field is well characterized. In addition, two obvious recirculation zones are formed in the mixing zones, and the pressure on the rotor and stator is well characterized. Furthermore, the simulation results using improved standard k-ε turbulence model show that surface tension coefficient of 0.072, drag model of Grace and coefficient of 4, and lift coefficient of 0.001 can be achieved. The research results suggest that gas-fluid two-phase flow in large flotation cell can be well simulated using computational fluid dynamics method.
SHEN Zheng-chang(沈政昌)1, CHEN Jian-hua(陈建华)2, ZHANG Chen-hu(张谌虎)2, LIAO Xing-jin(廖幸锦)2, LI Yu-qiong(李玉琼)2
(1. Machinery Research Institute, Beijing General Research Institute of Mining & Metallurgy, Beijing 100070, China;
2. College of Resources and Metallurgy, Guangxi University, Nanning 530004, China)
Abstract:According to the recently developed single-trough floating machine with the world’s largest volume (inflatable mechanical agitation flotation machine with volume of 320 m3) in China, the gas-fluid two-phase flow in flotation cell was simulated using computational fluid dynamics method. It is shown that hexahedral mesh scheme is more suitable for the complex structure of the flotation cell than tetrahedral mesh scheme, and a mesh quality ranging from 0.7 to 1.0 is obtained. Comparative studies of the standard k-ε, k-ω and realizable k-ε turbulence models were carried out. It is indicated that the standard k-ε turbulence model could give a result relatively close to the practice and the liquid phase flow field is well characterized. In addition, two obvious recirculation zones are formed in the mixing zones, and the pressure on the rotor and stator is well characterized. Furthermore, the simulation results using improved standard k-ε turbulence model show that surface tension coefficient of 0.072, drag model of Grace and coefficient of 4, and lift coefficient of 0.001 can be achieved. The research results suggest that gas-fluid two-phase flow in large flotation cell can be well simulated using computational fluid dynamics method.
Key words:computational fluid dynamics (CFD) simulation; flotation cell; gas-liquid two-phases flow
