CLC number: TK121; TK229.66
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Received: 2008-01-14
Revision Accepted: 2008-04-22
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Xue-cheng WU, Qin-hui WANG, Chen TIAN, Zhong-yang LUO, Meng-xiang FANG, Ke-fa CEN. Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser[J]. Journal of Zhejiang University Science A, 2008, 9(7): 922-931.
@article{title="Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser",
author="Xue-cheng WU, Qin-hui WANG, Chen TIAN, Zhong-yang LUO, Meng-xiang FANG, Ke-fa CEN",
journal="Journal of Zhejiang University Science A",
volume="9",
number="7",
pages="922-931",
year="2008",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A0820034"
}
%0 Journal Article
%T Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser
%A Xue-cheng WU
%A Qin-hui WANG
%A Chen TIAN
%A Zhong-yang LUO
%A Meng-xiang FANG
%A Ke-fa CEN
%J Journal of Zhejiang University SCIENCE A
%V 9
%N 7
%P 922-931
%@ 1673-565X
%D 2008
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0820034
TY - JOUR
T1 - Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser
A1 - Xue-cheng WU
A1 - Qin-hui WANG
A1 - Chen TIAN
A1 - Zhong-yang LUO
A1 - Meng-xiang FANG
A1 - Ke-fa CEN
J0 - Journal of Zhejiang University Science A
VL - 9
IS - 7
SP - 922
EP - 931
%@ 1673-565X
Y1 - 2008
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0820034
Abstract: particle rotation plays an important role in gas-solid flows. This paper presents an experimental investigation on the spatial distribution of average rotation speed for glass beads in the upper dilute zone of a cold circulating fluidized bed (CFB) riser. It is shown that in the horizontal direction, the average rotation speed in the near-wall area is larger than that in the center area, while in the vertical direction, it decreases as the height increases. The reason resulting in this distribution is analyzed by considering several factors including particle size, particle shape, particle number density, particle collision behavior, and the surrounding flow field, etc. The effects of CFB operation conditions on the spatial distribution of average rotation speed are also studied. The results show that the increasing superficial gas velocity increases the average rotation speed of particles in the near wall area but takes nearly no effect on that in the center area. The external solids mass flux, however, takes the opposite effect. It is found that the average rotation speeds of particles in both areas are increased as the total amount of bed material increases.
[1] Alipchenkov, V.M., Zaichik, L.I., 2001. Particle collision rate in turbulent flow. Fluid Dynamics, 36(4):608-618.
[2] Cen, K.F., Fan, J.R., 1990. Theory and Calculation of Engineering Gas-solid Multiphase Flow. Zhejiang University Press, Hangzhou, p.105-220 (in Chinese).
[3] Damaschke, N., Nobach, H., Tropea, C., 2002. Optical limits of particle concentration for multi-dimensional particle sizing techniques in fluid mechanics. Experiments in Fluids, 32(2):143-152.
[4] Dong, Z., Liu, X., Wang, X., Li, F., Zhao, A., 2004. Experimental investigation of the velocity of a sand cloud blowing over a sandy surface. Earth Surface Processes and Landforms, 29(3):343-358.
[5] Fan, R., Fox, R.O., 2008. Segregation in polydisperse fluidized beds: validation of a multi-fluid model. Chemical Engineering Science, 63(1):272-285.
[6] Goldschmidt, M.J.V., Link, J.M., Mellema, S., Kuipers, J.A.M., 2003. Digital image analysis measurements of bed expansion and segregation dynamics in dense gas-fluidised beds. Powder Technology, 138(2-3):135-159.
[7] Goldschmidt, M.J.V., Beetstra, R., Kuipers, J.A.M., 2004. Hydrodynamic modelling of dense gas-fluidised beds: comparison and validation of 3D discrete particle and continuum models. Powder Technology, 142(1):23-47.
[8] Gui, N., Fan, J., Luo, K., 2007. Experimental study on collision rates of inertial particles in particulate flows under the effect of gravity. Chemical Engineering Science, 62(22):6112-6120.
[9] Helland, E., Bournot, H., Occelli, R., Tadrist, L., 2007. Drag reduction and cluster formation in a circulating fluidised bed. Chemical Engineering Science, 62(1-2):148-158.
[10] Hui, Y., Hu, E., 1991. Saltation characteristics of particle motions in water. Shuili Xuebao, 12:59-64 (in Chinese).
[11] Hussainov, M., Kartushinsky, A., Mulgi, A., Rudi, U., 1996. Gas-solid flow with the slip velocity of particles in a horizontal channel. Journal of Aerosol Science, 27(1):41-59.
[12] Hyre, M.R., Glicksman, L.R., 2000. Axial and lateral solids distribution modeling in the upper region of circulating fluidized beds. Powder Technology, 110(1-2):98-109.
[13] Kadambi, J.R., Martin, W.T., Amirthaganesh, S., Wernet, M.P., 1998. Particle sizing using particle imaging velocimetry for two-phase flows. Powder Technology, 100(2-3):251-259.
[14] Kajishima, T., 2004. Influence of particle rotation on the interaction between particle clusters and particle-induced turbulence. International Journal of Heat and Fluid Flow, 25(5):721-728.
[15] Kale, S.R., Ramezan, M., Anderson, R.J., 1989. Measurement of particle rotational velocity using a Laser Anemometer. Particle and Particle Systems Characterization, 6(1-4):59-63.
[16] Lee, H.Y., Hsu, I.S., 1996. Particle spinning motion during saltating process. Journal of Hydraulic Engineering, 122(10):587-590.
[17] Liu, C., Guo, Y., 2006. Mechanisms for particle clustering in upward gas-solid flows. Chinese Journal of Chemical Engineering, 14(2):141-148.
[18] Liu, H.X., 1965. Discussion on Movement Regularity of Solid Fuel in a Cyclone Furnace. M.S. Thesis, Zhejiang University, Hangzhou, p.25-34 (in Chinese).
[19] Liu, M., Zhang, H.Q., Chan, C.K., Lau, K.S., Lin, W.Y., 2006. Study of cluster formation in dense two-phase flow using a multi-lattice deterministic model. Powder Technology, 162(3):175-182.
[20] Luo, Z.Y., Wu, X.C., Wang, Q.H., Gao, Q., Fang, M.X., Cen, K.F., 2005. Particle rotation characteristics in CFB riser. Journal of Chemical Industry and Engineering (China), 56(10):1869-1874 (in Chinese).
[21] Meyer, J., Umhauer, H., Reuter, K., Schiel, A., Kasper, G., Forster, M., 2008. Concentration and size measurements of fly ash particles from the clean gas side of a pressurised pulverised coal combustion test facility. Powder Technology, 180(1-2):57-63.
[22] Moran, J.C., Glicksman, L.R., 2003. Mean and fluctuating gas phase velocities inside a circulating fluidized bed. Chemical Engineering Science, 58(9):1867-1878.
[23] Shi, H.X., 2003. PIV measurement and Numerical Simulation of the Hydrodynamics of Gas-solid in a CFB Riser. Ph.D Thesis, Zhejiang University, Hangzhou, p.122-129 (in Chinese).
[24] Sun, J., Battaglia, F., 2006. Hydrodynamic modeling of particle rotation for segregation in bubbling gas-fluidized beds. Chemical Engineering Science, 61(5):1470-1479.
[25] Tsuji, Y., Morkawa, Y., Mizumo, O., 1985. Experimental measurement of he Magnus force on a rotating sphere at low Reynolds numbers. Journal Fluid Engineering, 107:484-488.
[26] Volkov, A.N., Tsirkunov, Y.M., Oesterle, B., 2005. Numerical simulation of a supersonic gas-solid flow over a blunt body: the role of inter-particle collisions and two-way coupling effects. International Journal of Multiphase Flow, 31(12):1244-1275.
[27] Wang, S., Liu, H., Lu, H., Liu, W., Ding, J., Li, W., 2005. Flow behavior of clusters in a riser simulated by direct simulation Monte Carlo method. Chemical Engineering Journal, 106(3):197-211.
[28] White, B.R., 1982. Two-phase measurements of saltating turbulent boundary layer flow. International Journal of Multiphase Flow, 8(5):459-473.
[29] White, B.R., Schulz, J.C., 1977. Magnus effect in saltation. Journal Fluid Mechanics, 81(3):497-512.
[30] Wu, X.C., 2007. Study of Laser-based Measurement Techniques for Particle Motion Characteristics in Multi-phase Flows. Ph.D Thesis, Zhejiang University, Hangzhou, p.41-78 (in Chinese).
[31] Wu, X.C., Wang, Q.H., Luo, Z.Y., Fang, M.X., Cen, K.F., 2008a. Experimental study of particle rotation characteristics with high-speed digital imaging system. Powder Technology, 181(1):21-30.
[32] Wu, X.C., Wang, Q.H., Luo, Z.Y., Fang, M.X., Cen, K.F., 2008b. Study of Particle rotation speed measurement method based on cross-correlation of gray distribution. Proceedings of the CSEE, 28(8):71-76. (in Chinese).
[33] You, C., Zhao, H., Cai, Y., Qi, H., Xu, X., 2004. Experimental investigation of interparticle collision rate in particulate flow. International Journal of Multiphase Flow, 30(9):1121-1138.
[34] Yuan, Z.L., Ma, M., Xu, Y.Q., 2001. Study on effect of particle rotation on fluidizing behavior using discrete numerical simulation method. Journal Combustion Science and Technology, 7(3):238-241 (in Chinese).
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