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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (2): 151-156    DOI: 10.3969/j.issn.1674-8530.2013.02.013
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CFD-DPM simulation of gasliquid dispersion in a dual impeller mixing tank
 LI  Liang-Chao, XU  Bin, XIANG  Ke-Feng

(Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China)
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Abstract In order to study the gas dispersion and backmixing′s effect on its function in a gasliquid mixing reactor, on the basis of the computational fluid dynamics (CFD) software package Fluent 6.2, with a Euler model of liquid phase, and a discrete phase mode (DPM) of gas, discrete gas phase gasliquid flow in a dual sixbladediscturbine (6-DT) impeller mixing tank was numerically simulated. The macro flow field and gas residence distribution in the mixing tank was obtained. By counting bubbles escaped from the vessel at different times, gas residence time distribution in the tank was analyzed. The simulation results show that typical double circulation pattern is formed for every disc turbine and there are four circulation loops in the mixing tank. Gas easily gathers together at the center of the circulation loops, which leads to high local gas holdup there and relatively low gas holdup in the bottom region and regions between two impellers. The curve of gas residence time distribution displays as a singlepeak and a long tail, which is mainly affected by flow patterns, bubble sizes and operating circumstances. To increase impeller speed or decrease gas flow will be helpful for backmixing and gas dispersion in the mixing tank.
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LI Liang-Chao
XU Bin
XIANG Ke-Feng
Key wordsmixing tank   gasliquid flow   gas holdup   discrete phase model   numerical simulation   gas residence time distribution     
Received: 2012-06-12; Published: 2013-02-28
Cite this article:   
LI Liang-Chao,XU Bin,XIANG Ke-Feng. CFD-DPM simulation of gasliquid dispersion in a dual impeller mixing tank[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(2): 151-156.
 
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