JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.5 P.664-671

Motion and orientation of cylindrical and cubic particles in pipe flow with high concentration and high particle to pipe size ratio

Author(s): Xiao-ke KU, Jian-zhong LIN
Affiliation(s): Department of Mechanics, Zhejiang University, Hangzhou 310027, China; more
Corresponding email(s): mecjzlin@public.zju.edu.cn
Key Words: Particulate flow, Angular velocity, Orientation, Lattice Boltzmann method

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Abstract: lattice Boltzmann method was used to numerically investigate the motion and orientation distribution of cylindrical and cubic particles in pipe flow with high concentration and high particle to pipe size ratio. The transient impulse model of 3D collisions between particles and between particle and wall is proposed. The numerical results are qualitatively in agreement with and quantitatively comparable to the experiment data. The results show that the increases of both the cylindrical particle to pipe size ratio and the particle aspect ratio decrease the rotation about all axes. All rotations of cubic particles decrease with increasing the particle concentration. The cubic particles, rotating more drastically in the flow with large Reynolds number, rotate faster than the cylindrical particles with the same size. The cylindrical particles align with the flow direction more obviously with decreasing Reynolds numbers. However, the orientations of cubic particles are spread all over the range with no significant difference in magnitude, and the Reynolds numbers have no obvious effect on the orientations of cubic particles.

Reference

[1] Ausias, G., Fan, X.J., Tanner, R.I., 2006. Direct simulation for concentrated fibre suspensions in transient and steady state shear flows. J. Non-Newtonian Fluid Mech., 135(1):46-57.

[2] Bernstein, O., Shapiro, M., 1994. Direct determination of the orientation distribution function of cylindrical particles immersed in laminar and turbulent flow. J. Aerosol. Aci., 25(1):113-136.

[3] Bhatnagar, P.L., Gross, E.P., Krook, M., 1954. A model for collision processes in gases. I: Small amplitude processes in charged and neutral one-component system. Phys. Rev., 94(3):511-525.

[4] Chen, H., Chen, S., Matthaeus, W.H., 1992. Recovery of the Navier-Stokes equations using a Lattice-gas Boltzmann method. Phys. Rev. A, 45(8):R5339-R5342.

[5] Chen, S., Doolen, G.D., 1998. Lattice Boltzmann method for fluid flows. Ann. Rev. Fluid Mech., 30(1):329-364.

[6] Ding, E., Aidun, C., 2000. The dynamics and scaling law for particles suspended in shear flow with inertia. J. Fluid Mech., 423:317-344.

[7] Evans, D. J., 1977. On the representation of orientation space. Molecular Physics, 34(2):317-325.

[8] Krushkal, E.M., Gallily, I., 1988. On the orientation distribution function of non-spherical aerosol particles in a general shear flow—II: The turbulent case. J. Aerosol. Aci., 19(2):197-211.

[9] Ku, X.K, Lin, J.Z, 2007. Orientational distribution of fibres in sheared fibre suspensions. Chinese Physics Letters, 24(6):1622-1625.

[10] Ladd, A.J.C., 1994a. Numerical simulations of particulate suspensions via a discretized Boltzmann equation. Part 1. Theoretical foundation. J. Fluid Mech., 271:285-309.

[11] Ladd, A.J.C., 1994b. Numerical simulations of particulate suspensions via a discretized Boltzmann equation. Part 2. Numerical results. J. Fluid Mech., 271:311-339.

[12] Lin, J.Z., Zhang, W.F., Wang, Y.L., 2002. Research on the orientation distribution of fibers immersed in a pipe flow. Journal of Zhejiang University SCIENCE, 3(5):501-506.

[13] Lin, J.Z., Zhang, W.F., Yu, Z.S., 2004. Numerical research on the orientation distribution of fibers immersed in laminar and turbulent pipe flows. J. Aerosol. Aci., 35(1):63-82.

[14] Qi, D., 2001. Simulations of fluidization of cylindrical multiparticles in a three-dimensional space. Int. J. Multiphase Flow, 27(1):107-118.

[15] Yasuda, K., Henmi, S., Mori, N., 2005. Effects of abrupt expansion geometries on flow-induced fiber orientation and concentration distributions in slit channel flows of fiber suspensions. Polym. Compos., 26(5):660-670.

[16] Zitoun, K.B., Sastry, S.K., Guezennec, Y., 2001. Investigation of three dimensional interstitial velocity, solids motion, and orientation in solid-liquid flow using particle tracking velocimetry. Int. J. Multiphase Flow, 27(8):1397-1414.

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