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Research Papers: Flows in Complex Systems

Numerical Simulation of Flow Past Multiple Porous Cylinders

[+] Author and Article Information
M. H. Al-Hajeri

Faculty of Technical Studies, PAAET, Roudha, Kuwait 73460

A. Aroussi

School of Engineering, Leicester University, Leicester, LE1 7RH, UK

A. Witry

 Automotive R&D Center, Windsor, ON, N9B 3P4 Canada

J. Fluids Eng 131(7), 071101 (Jun 19, 2009) (10 pages) doi:10.1115/1.3153363 History: Received June 20, 2007; Revised April 15, 2009; Published June 19, 2009

The present study numerically investigates two-dimensional laminar flow past three circular porous cylinders arranged in an in-line array. Six approaches to face velocity (Vi/Vf) ratios are used and particle trajectories are computed for a range of velocities and particle diameters. Furthermore, the flow past a solid cylinder, which had similar geometry characteristics to the porous cylinders used in this study, is compared with the flow around multiple porous cylinders. For the same range of Reynolds number (312–520), the flow behavior around the solid cylinder differs from the flow around the porous cylinders. The flow characteristics around solid cylinders are determined by the Reynolds number, whereas the flow characteristics around the porous cylinders are detrained by the Vi/Vf ratio. Stagnation areas are found behind each porous cylinder, and the size of these areas increases as the Vi/Vf velocity ratio increases. Furthermore, for the particle ranges used in power plants (<50μm), the particles were uniformly distributed around the surface of the porous cylinders.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The physical geometry of the multiple filter model

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Figure 2

Middle part of the unstructured mesh without the filter mesh

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Figure 3

The filter and the second inlet (or inlet 2)

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Figure 12

Velocity vectors (in m/s) behind the last filter for a Vi/Vf ratio of 5 (Vf=4 cm/s)

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Figure 13

Static pressure for a Vi/Vf ratio of 1.8 (Vf=4 cm/s)

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Figure 14

The maximum velocity for different Vi/Vf ratios (Vf=4 cm/s)

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Figure 15

Velocity vectors for solid cylinders for approach velocity of 7.2 cm/s (a) upstream of the first cylinder, (b) between the first and second cylinders, (c) between the second and third cylinders, and (d) downstream of the first cylinder

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Figure 4

Velocity in the y-direction at (a) x=33.5 cm, (b) x=40 cm, (c) x=58.5 cm, and (g) y=33.5 cm, and velocity in the x-direction at (d) x=33.5 cm, (e) x=40 cm, and (f) x=58.5 cm; (h) the location of the velocity profiles (filters location are from 16.25 cm to 22.75 cm in y-distance)

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Figure 5

(a) The radius of convergence. Particle tracking of (b) 1 μm and Vi/Vf of 1.8, (c) 1 μm and Vi/Vf of 5, and (d) 200 μm and Vi/Vf of 5.

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Figure 6

The radius of convergence

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Figure 7

Velocity magnitude contours (in m/s) for a Vi/Vf ratio of 1.8 and face velocity of 4 cm/s

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Figure 8

Velocity magnitude contours (in m/s) for a Vi/Vf ratio of 2.5 and face velocity of 4 cm/s

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Figure 9

Velocity magnitude contours (in m/s) for a Vi/Vf ratio of 5 and face velocity of 4 cm/s

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Figure 10

Velocity vectors (in m/s) between the filters for a Vi/Vf ratio of 2 and face velocity of 4 cm/s

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Figure 11

Velocity vectors (in m/s) between the first and second filter for a Vi/Vf ratio of 5 (Vf=4 cm/s)

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