Investigation of Fluid Flow in a Dual Rushton Impeller Stirred Tank Using Particle Image Velocimetry

›› 2008, Vol. 16 ›› Issue (5): 693-699.

Investigation of Fluid Flow in a Dual Rushton Impeller Stirred Tank Using Particle Image Velocimetry

潘春妹, 闵健, 刘心洪, 高正明

College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2008-01-22 修回日期:2008-05-21 出版日期:2008-10-28 发布日期:2008-10-28
通讯作者: GAO Zhengming,E-mail:gaozm@mail.buct.edu.cn
基金资助:
the National Natural Science Foundation of China(20776008);the National Basic Research Program of China(2007CB714300).

Investigation of Fluid Flow in a Dual Rushton Impeller Stirred Tank Using Particle Image Velocimetry

PAN Chunmei, MIN Jian, LIU Xinhong, GAO Zhengming

College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2008-01-22 Revised:2008-05-21 Online:2008-10-28 Published:2008-10-28
Supported by:
the National Natural Science Foundation of China(20776008);the National Basic Research Program of China(2007CB714300).

摘要/Abstract

摘要： The flow fields in a dual Rushton impeller stirred tank with diameter of 0.48 m(T)were measured by using Particle Image Velocimetry(PIV).Three different size impellers were used in the experiments with diameters of D=0.33T,0.40T and 0.50T,respectively.The multi-block and 360°ensemble-averaged approaches were used to measure the radial and axial angle-resolved velocity distributions.Three typical flow patterns,named,merging flow,parallel flow and diverging flow,were obtained by changing the clearance of the bottom impeller above the tank base(C₁)and the spacing between the two impellers(C₂).The results show that while C₁ is equal to D,the parallel flow occurs as C₂≥0.40T,C₂≥0.38T and C₂≥0.32T and the merging flow occurs as C₂≤0.38T, C₂≤0.36T and C₂≤0.27T for the impellers with diameter of D=0.33T,0.40T and 0.50T,respectively.When C₂ is equal to D,the diverging flow occurs in the value of C₁≤0.15T for all three impellers.The flow numbers of these impellers were calculated for the parallel flow.Trailing vortices generated by the lower impeller for the diverging flow were shown by the 10°angleresolved velocity measurements.The peak value of turbulence kinetic energy (k/V_tip²=0.12-0.15 or above)appears along the center of the impeller discharging stream.

关键词: particle image velocimetry, dual Rushton, flow field, flow pattern

Abstract: The flow fields in a dual Rushton impeller stirred tank with diameter of 0.48 m(T)were measured by using Particle Image Velocimetry(PIV).Three different size impellers were used in the experiments with diameters of D=0.33T,0.40T and 0.50T,respectively.The multi-block and 360°ensemble-averaged approaches were used to measure the radial and axial angle-resolved velocity distributions.Three typical flow patterns,named,merging flow,parallel flow and diverging flow,were obtained by changing the clearance of the bottom impeller above the tank base(C₁)and the spacing between the two impellers(C₂).The results show that while C₁ is equal to D,the parallel flow occurs as C₂≥0.40T,C₂≥0.38T and C₂≥0.32T and the merging flow occurs as C₂≤0.38T, C₂≤0.36T and C₂≤0.27T for the impellers with diameter of D=0.33T,0.40T and 0.50T,respectively.When C₂ is equal to D,the diverging flow occurs in the value of C₁≤0.15T for all three impellers.The flow numbers of these impellers were calculated for the parallel flow.Trailing vortices generated by the lower impeller for the diverging flow were shown by the 10°angleresolved velocity measurements.The peak value of turbulence kinetic energy (k/V_tip²=0.12-0.15 or above)appears along the center of the impeller discharging stream.

Key words: particle image velocimetry, dual Rushton, flow field, flow pattern

潘春妹, 闵健, 刘心洪, 高正明. Investigation of Fluid Flow in a Dual Rushton Impeller Stirred Tank Using Particle Image Velocimetry[J]. , 2008, 16(5): 693-699.

PAN Chunmei, MIN Jian, LIU Xinhong, GAO Zhengming. Investigation of Fluid Flow in a Dual Rushton Impeller Stirred Tank Using Particle Image Velocimetry[J]. , 2008, 16(5): 693-699.

参考文献

1 Kuboi, R., Nienow, A.W., “The power drawn by dual impeller systems under gassed and ungassed conditions”, In:4th European Conference on Mixing, Noordwijkerhout, The Netherlands, 247 (1982).
2 Weng, Z.X., Huang, Z.M., Li, Y.M., “The effect of the distance between multiple impellers in the turbulent tank”, Chemical Engineering, 6, 1-6 (1983). (in Chinese).
3 Mishra, V.P., Joshi, J.B., “Flow generated by a disc turbine (IV) Multiple impellers”, Trans. IchemE, 72, 657-668 (1994).
4 Mahmoudi, S.M.S., Rutherford, K., Lee, K.C., Yianneskis M., “A study of the turbulence characteristics of dual-impeller mixing systems using LDA”, IChemE Symposium Ser 136 (8th Eur. Conf. on Mixing), 137-145 (1994).
5 Rutherford, K., Lee, C., “Hydrodynamic characteristic of dual Rushton impeller stirred vessels”, AIChE J., 42, 332-346 (1996).
6 Mao, D.M., “Study on mixing and flow in vessels stirred by multideck impellers”, Ph. D. Thesis, Zhejiang University, Hangzhou (1998). (in Chinese) .
7 Sharp, K.V., Adrian, R.J., “PIV study of small-scale flow structure around a Rushton impeller”, AIChE J., 47, 766-778 (2001).
8 Gao, D., Acharya, S., Wang, Y., Uhm, J., “Flow field around Rushton impeller in stirred tank by particle image velocimetry measurement”, Chin. J. Chem. Eng., 12, 843-850 (2004).
9 Khan, F.R., Rielly, C.D., Brown, D.A.R.. “Angleresolved stereo-PIV measurements close to a down-pumping pitched-balde turbine”, Chem. Eng. Sci., 61, 2799-2806 (2006).
10 Chung, K.H.K., Barigou, M., Simmons, M.J.H., “Reconstruction of 3-D field inside miniature stirred vessels using a 2-D PIV technique”, In:12th European Conference on Mixing, Bologna, Italy, 407-414 (2006).
11 Khan, F.R., Rielly, C.D., Hargrave, G.K., “A multi-block approach to obtain angle-resolved PIV measurements of the mean flow and turbulence fields in a stirred vessel”, Chem. Eng. Technol., 3, 264-269 (2004).
12 Wu, Y., Min, J., Li, Z.P., Gao, Z.M., “Particle image velocimetry study of the flow structure in a stirred tank”, Journal of Beijing University of Chemical Technology, 6, 561-565 (2007). (in Chinese) .
13 Montante, G., Lee K.C., Brucato, A., Yianneskis, M., “Experiments and predictions of the transition of the flow pattern with impeller clearance in stirred tanks”, Comput. Chem. Eng., 25, 729-735 (2001).
14 Giorgio, M., Alberto, B., Franco, G., “Prediction of flow fields in a dual-impeller stirred vessel”, AIChE J., 45, 445-464 (1999).
15 Cooper, R.G., Woolf, D., “Velocity profiles and pumping capacity for turbine type impeller”, Can. J. Chem. Eng., 46, 94-108 (1986).
16 Revill, B.K., “Pumping capacity of disk turbine agitators”, In:4th European Conference on Mixing, Noordwijkerhout, The Netherlands, 4, 27-29 (1982).
17 Van't Riet, K., Bruijn, W., Smith, J.M., “Real and pseudo-turbulence in the discharge stream from a Rushton impeller”, Chem. Eng. Sci., 31, 407-412 (1976).
18 Yianneskis, M., Popiolek, Z., Whitelaw, J.H., “An experimental study of the steady and unsteady flow characteristics of stirred reactors”, J. Fluid Mech., 75, 537-555 (1987).
19 Stoots, C.M., Calabrese, R.V., “Mean velocity field relative to a Rushton impeller blade”, AIChE J., 41, 1-11 (1995).
20 Lee, K.C, Yianneskis, M., “Turbulence properties of the impeller stream in a Rushton impeller”, AIChE J., 44, 13-24 (1998).
21 Wu, H., Patterson, G.K., “Laser-Doppler measurement of turbulent-flow parameters in a stirred mixer”, Chem. Eng. Sci., 44, 2207-2221 (1989).
22 Yianneskis, M., Whitelaw, J.H., “On the structure of the trailing vortices around Rushton turbine blades”, Trans. IChemE, 71A, 543-550 (1993).

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Investigation of Fluid Flow in a Dual Rushton Impeller Stirred Tank Using Particle Image Velocimetry

Investigation of Fluid Flow in a Dual Rushton Impeller Stirred Tank Using Particle Image Velocimetry

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