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TECHNICAL PAPERS

Numerical Simulation of the Particle Motion Characteristics in Boundary Layer of Gas-Solid Rotary Flow

[+] Author and Article Information
Jingyu Ran

Institute of Thermal Power Engineering, Chongqing University, Chongqing 400044, Chinaranjy@cqu.edu.cn

Li Zhang, Qiang Tang, Mingdao Xin

Institute of Thermal Power Engineering, Chongqing University, Chongqing 400044, China

J. Fluids Eng 128(3), 596-601 (Nov 09, 2005) (6 pages) doi:10.1115/1.2175166 History: Received March 17, 2005; Revised November 09, 2005

The boundary-layer feature and the forces on the particle are analyzed in detail, and the motion parameters of the particle in the gas-solid rotary flow are divided into two parts according to the r-z meridian and r-θ cross section. The Lagrange method is then applied, the 3-D mathematical model of particle motion in the gas-solid rotary flow is presented, and the Gear integral method is applied to simulate the motion characteristics of the particles. The results show that the centrifugal force and Saffman lift force play important roles in the process of the particle being separated from the gas-solid rotary flow in the rotary boundary layer. The velocity gradient of radial direction is the biggest, and that of tangent direction is the smallest. For a higher density ratio of gas to solid, the deposition performance of the particle depends not only on the inlet flow velocity but also on the range of the particle diameter. Reasonable velocity gradient matching of the three directions (r,z,θ) in the gas-solid rotary flow is useful to improve the separation efficiency of the rotary separators.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

The r-z meridian and r-θ across section of separator

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Figure 2

The velocity Vfθ+ and Vpd+(dp+=2) under different r+

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Figure 3

The relationship among r+, dp+, and Vi+

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Figure 4

The transient characteristics of the Vfθ+ and Vpθ+(dp+=2)

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Figure 5

The transient characteristics of the Vpr+(dp+=2,6) under different Vi+

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Figure 6

The transient characteristics of the Vpz+(dp+=2,6) under different Vi+

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Figure 7

The motion trace of particles on the r-z meridian and r-θ across section of cyclone

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