Dynamic flow modelling in precipitator vessels - A study of turbulence modelling approaches

被引：9

作者：

Brown, Gary J. ^{[1
]}

Whyte, David S. ^{[1
]}

Fletcher, David F. ^{[2
]}

机构：

[1] ALCOA Australia Proprietary Ltd, Kwinana, Qld, Australia

[2] Univ Sydney, Sch Chem & Biomol Engn, Sydney, NSW 2006, Australia

来源：

APPLIED MATHEMATICAL MODELLING | 2014年 / 38卷 / 17-18期

关键词：

CFD; Scale Adaptive Simulation (SAS); Reynolds stress model; RANS modelling; Mixing vessel; SIMULATION;

D O I：

10.1016/j.apm.2013.11.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Precipitation is a fundamental unit process within the Bayer circuit for the production of smelter-grade alumina, with the predominant technology used in this unit process being the mechanically-agitated draft-tube precipitator. Previous physical modelling studies have identified dynamic behaviour in these vessels which could potentially impact fluid residence time and the ability to obtain adequate solids suspension. In the current study the commercial CFD code ANSYS CFX14 is used to simulate the dynamic, single phase flow behaviour in a laboratory-scale replica of a full-scale precipitator. Simulations are conducted to investigate the impact of mesh refinement and turbulence model selection, with two-equation, Reynolds Stress and the Scale Adaptive Simulation (SST-SAS) models being investigated. The impact of the different modelling choices on the accuracy of the simulations is assessed through comparison of the CFD results with high-quality Laser Doppler Velocimetry (LDV) data obtained in a laboratory-scale vessel. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：4163 / 4174

页数：12

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