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http://hdl.handle.net/10397/5281
| Title: | Orientation distribution of cylindrical particles suspended in a turbulent pipe flow | Authors: | Zhang, LX Lin, JZ Chan, TL |
Issue Date: | Sep-2005 | Source: | Physics of fluids, Sept. 2005, v. 17, no. 9, 093105, p. 1-8 | Abstract: | A model of turbulent cylindrical particle suspensions is proposed to predict the orientation distribution of particles. The fluctuating equation for the orientation distribution function (ODF) of cylindrical particles is theoretically solved using the method of characteristics. The orientation-correlated terms in the mean equation for the ODF due to the random motion of cylindrical particles are related to the correlations of the mean ODF and the fluid velocity gradient. Thus, the evolution of the mean ODF is described by a modified convection-dispersion equation. The model and modified equation are used to calculate the ODF in a pipe flow numerically. The results compare qualitatively with the experimental data and show that the turbulent dispersion makes cylindrical particles have a broad orientation distribution, while the velocity gradient plays an opposite role. The increase of the particle aspect ratio leads to a less aligned distribution in the vicinity of the axis and a narrower orientation distribution at positions far from the axis. | Keywords: | Suspensions Two-phase flow Turbulence diffusion Pipe flow Convection Shear turbulence |
Publisher: | American Institute of Physics | Journal: | Physics of fluids | ISSN: | 1070-6631 (print) 1089-7666 (online) |
DOI: | 10.1063/1.2046713 | Rights: | © 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in L.-. Zhang, J.-. Lin & T. L. Chan, Physics of Fluids 17, 093105 (2005) and may be found at http://link.aip.org/link/?phf/17/093105 |
| Appears in Collections: | Journal/Magazine Article |
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|---|---|---|---|---|
| Zhang_Orientation_Cylindrical_Particles.pdf | 546.51 kB | Adobe PDF | View/Open |
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