JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2015, Vol. 45 ›› Issue (1): 76-81.doi: 10.6040/j.issn.1672-3961.0.2014.258

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Turbulent flow in a stirred tank equipped with half-circle-tube baffles

ZHANG Cuixun1, YANG Fengling2,3, LIAN Jiyong4   

  1. 1. Shandong Tianli Drying Equipment Co., Ltd, Jinan 250014, Shandong, China;
    2. School of Mechanical Engineering, Shandong University, Jinan 250061, Shandong, China;
    3. Key Lab of High-efficiency and Clean Mechanical Manufacture (Shandong University), Ministry of Education, Jinan 250061, Shandong, China;
    4. Dazhong News Group, Jinan 250014, Shandong, China
  • Received:2014-09-15 Revised:2014-11-26 Published:2014-09-15

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Abstract: For the purpose of improving the hydrodynamics in stirred tanks, a half-circle-tube baffle stirred tank was developed and the turbulent flow characteristics in it were studied using the standard k-ε model and the multiple reference frame (MRF) method. The modeling and simulation method were validated by comparisons with the experimental results from the reported literature. Subsequently, the flow fields, velocity and turbulent kinetic energy distributions, and power consumption were analyzed and compared with their counterparts in the standard stirred tank. The results showed that the new configuration developed here has the advantage of enhancing the uniformity of fluid velocity distribution, improving the axial and tangential velocity, as well as the turbulent kinetic energy. Besides, the power consumption can be reduced about 5%, which has the advantage of energy saving.

Key words: half-circle-tube baffle, computational fluid dynamics, stirred tank, turbulence, flow field

CLC Number: 

  • TQ027
[1] LAMBERTO D J, MUZZIO F J, SWANSON P D, et al. Using time-dependent RPM to enhance mixing in stirred vessels[J]. Chemical Engineering Science, 1996, 51(5):733-741.
[2] FOUNTAIN G O, KHAKHAR D V, OTTINO J M. Visualization of three-dimensional chaos[J]. Science, 1998, 281:683-686.
[3] ALVAREZ M M, SHINBROT T, ZALC J, et al. Practical chaotic mixing[J]. Chemical Engineering Science, 2002, 57(17):3749-3753.
[4] 丁绪淮,周理. 液体搅拌[M]. 北京:化学工业出版社, 1983.
[5] 永田进治. 混合原理与应用[M]. 马继舜译.北京:化学工业出版社, 1984.
[6] STREK F, KARCZ J. Experimental studies of power consumption for agitated vessels equipped with non-standard baffles and high-speed agitator[J]. Chemical Engineering and Processing:Process Intensification, 1993, 32(6):349-357.
[7] KARCZ J, STREK F. Heat transfer in jacketed agitated vessels equipped with non-standard baffles[J]. Chemical Engineering Journal, 1995, 58(2):135-143.
[8] 戴干策, 陈剑佩, 张家庭, 等. 具有槽缝挡板的搅拌反应器:中国, 02265664.2[P]. 2002-07-22. DAI Gance, CHEN Jianpei, ZHANG Jiating, et al. Mechanically agitated reactor with slot baffles:China, 02265664.2[P]. 2002-07-22.
[9] SIVASHANMUGAM P, SANDEEP P. Experimental studies and CFD modeling on the effects of a cut in the baffle on power consumption[J]. Chemical Product and Process Modeling, 2009, 4(1):75.
[10] 杨锋苓, 周慎杰, 王贵超, 等. 非标准挡板搅拌槽内湍流流场的数值模拟[J]. 高校化学工程学报, 2012, 26(6):952-958. YANG Fengling, ZHOU Shenjie, WANG Guichao, et al. Study on the hydrodynamics of a stirred tank equipped with non-standard baffles[J]. Journal of Chemical Engineering of Chinese Universities, 2012, 26(6):952-958.
[11] 王星星, 刘志炎, 龙伟民, 等. 椭圆底封头十字形挡板搅拌釜内流畅研究[J]. 机械工程学报, 2014, 50(6):156-164. WANG Xingxing, LIU Zhiyan, LONG Weimin, et al. Research on flow field in elliptic bottom stirred tank with cruciform baffles[J]. Journal of Mechanical Engineering, 2014, 50(6):156-164.
[12] MURTHY B N, JOSHI J B. Assessment of standard k-ε, RSM and LES turbulence models in a baffled stirred vessel agitated by various impeller designs[J]. Chemical Engineering Science, 2008, 63(22):5468-5495.
[13] SINGH H, FLETCHER D F, NIJDAM J J. An assessment of different turbulence models for predicting flow in a baffled tank stirred with a Rushton turbine[J]. Chemical Engineering Science, 2011, 66(23):5976-5988.
[14] WU H, PATTERSON G K. Laser-Doppler measurements of turbulent-flow parameters in a stirred mixer[J]. Chemical Engineering Science, 1989, 44(10):2207-2221.
[15] RUTHERFORD K, MAHMOUDI S M S, LEE K C, et al. The influence of Rusthon impeller blade and disk thickness on the mixing characteristics of stirred vessels[J]. Chemical Engineering Research and Design, 1996, 74(3):369-378.
[16] DELAFOSSE A, LIN A, MORCHAIN J, et al. LES and URANS simulations of hydrodynamics in mixing tank:comparison to PIV experiments[J]. Chemical Engineering Research and Design, 2008, 86(12):1322-1330.
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