Experimental and numerical study of gas hold-up in surface aerated stirred tanks

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	Experimental and numerical study of gas hold-up in surface aerated stirred tanks
	Sun, H; Mao, ZS; Yu, GZ
刊名	CHEMICAL ENGINEERING SCIENCE
	2006-06-01
卷号	61 期号:12 页码:4098-4110
关键词	stirred tank gas-liquid flow gas hold-up numerical simulation surface aeration Rushton impeller
ISSN号	0009-2509
其他题名	Chem. Eng. Sci.
中文摘要	Although the distribution of gas hold-up in stirred tanks is a key factor to their design and operation, systematic experimental data on local gas hold-up of surface-aerated stirred tanks are not available in open literature. In this work, turbulent two-phase flow in a surface aeration stirred tank with a diameter of 0.380m was investigated experimentally and numerically. The gas hold-up was measured with a conductance probe at various operating conditions. A surface baffle to improve the efficiency of surface aeration of a Rushton disk turbine was designed and tested. The experimental data suggest that the gas hold-up distribution in the surface aeration tank is very non-uniform, and the surface baffle improves the aeration rate particularly at a high agitation speed. A three-dimensional in-house computational fluid dynamic (CFD) two-fluid model with the standard k-epsilon-A(P) turbulence model was used to predict the gas-liquid flow, and the impeller region was handled using the improved inner-outer iterative procedure. Based on Kolmogoroff's theory of isotropic turbulence, a constitutive equation for surface aeration strength was proposed. The numerical prediction, in combination with the measurements, gives insight to the surface aeration performance of stirred tanks. it was found that the simulation reasonably predicted the gas hold-up distribution in the upper tank, but underestimated it in the region below the stirrer. (c) 2006 Elsevier Ltd. All rights reserved.
英文摘要	Although the distribution of gas hold-up in stirred tanks is a key factor to their design and operation, systematic experimental data on local gas hold-up of surface-aerated stirred tanks are not available in open literature. In this work, turbulent two-phase flow in a surface aeration stirred tank with a diameter of 0.380m was investigated experimentally and numerically. The gas hold-up was measured with a conductance probe at various operating conditions. A surface baffle to improve the efficiency of surface aeration of a Rushton disk turbine was designed and tested. The experimental data suggest that the gas hold-up distribution in the surface aeration tank is very non-uniform, and the surface baffle improves the aeration rate particularly at a high agitation speed. A three-dimensional in-house computational fluid dynamic (CFD) two-fluid model with the standard k-epsilon-A(P) turbulence model was used to predict the gas-liquid flow, and the impeller region was handled using the improved inner-outer iterative procedure. Based on Kolmogoroff's theory of isotropic turbulence, a constitutive equation for surface aeration strength was proposed. The numerical prediction, in combination with the measurements, gives insight to the surface aeration performance of stirred tanks. it was found that the simulation reasonably predicted the gas hold-up distribution in the upper tank, but underestimated it in the region below the stirrer. (c) 2006 Elsevier Ltd. All rights reserved.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Engineering, Chemical
研究领域[WOS]	Engineering
关键词[WOS]	LIQUID FLOW ; CHEMICAL REACTORS ; DISPERSION ; VESSELS ; MODEL ; SIMULATION ; TURBULENCE ; FERMENTER ; MECHANISM ; PHASE
收录类别	SCI
原文出处	://WOS:000237906600028
语种	英语
WOS记录号	WOS:000237906600028
公开日期	2013-10-24
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/3975]
专题	过程工程研究所_研究所（批量导入）
作者单位	Chinese Acad Sci, Inst Proc Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Sun, H,Mao, ZS,Yu, GZ. Experimental and numerical study of gas hold-up in surface aerated stirred tanks[J]. CHEMICAL ENGINEERING SCIENCE,2006,61(12):4098-4110.
APA	Sun, H,Mao, ZS,&Yu, GZ.(2006).Experimental and numerical study of gas hold-up in surface aerated stirred tanks.CHEMICAL ENGINEERING SCIENCE,61(12),4098-4110.
MLA	Sun, H,et al."Experimental and numerical study of gas hold-up in surface aerated stirred tanks".CHEMICAL ENGINEERING SCIENCE 61.12(2006):4098-4110.