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Fundamental Issues and Canonical Flows

Effect of Ground Arrangements on Swirling Flow in a Rectangular Duct Subjected to Electrohydrodynamic Effects

[+] Author and Article Information
Suwimon Saneewong Na Ayuttaya, Chainarong Chaktranond, Thatchapong Kreewatcharin

Department of Mechanical Engineering,Faculty of Engineering,  Thammasat University (Rangsit Campus), Pathumthani, 12120, Thailand

Phadungsak Rattanadecho1

Department of Mechanical Engineering,Faculty of Engineering,  Thammasat University (Rangsit Campus), Pathumthani, 12120, Thailandratphadu@engr.tu.ac.th

1

Corresponding author.

J. Fluids Eng 134(5), 051211 (May 22, 2012) (10 pages) doi:10.1115/1.4006699 History: Received December 20, 2011; Revised March 29, 2012; Published May 18, 2012; Online May 22, 2012

This study presents a numerical analysis of electric fields distribution, characteristics of swirling flow and effect of inlet velocity (u0 ) from two ground arrangements, i.e., wire-to-wire (WW) and wire-to-plate (WP) in a rectangular duct subjected to electrohydrodynamic. In both arrangements, location of an electrode wire, which is suspended from the upper wall of the duct, is initially located at the centerline of the rectangular duct, and ground is fixed on the bottom wall. In WW, position of electrode is varied in the vertical direction, while in WP, they are varied both in the vertical and horizontal directions. Electrical voltage of 20 kV is applied and inlet velocity in range of 0.3 – 1 m/s is selected. The numerical results show that electric fields distributions from both arrangements are quite different. These results cause the characteristics of swirling flows to appear differently. In both arrangements the maximum electric fields intensity are not different for each identical gap value. When the gap is closer, electric fields increase significantly. When inlet velocity of air is increased, the strength of swirling flow is decreased because inertial force is superior to the electric body force.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Mechanism of Corona wind [10] (a) Mechanism of high electrical voltage (b) Corona wind pattern

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Figure 2

Computational models (a) WW (b) WP

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Figure 3

Boundary conditions used in analysis (a) WW (b) WP

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Figure 4

Boundary conditions used in validation model

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Figure 5

Compare the visualized motion of airflow (V0  = 15 kV and u0  = 0.35 m/s) (a) experimental result (b) present simulated result

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Figure 6

Electric fields distribution (h = 2 cm, l = 0 cm, u0  = 0 m/s, V0  = 20 kV) (a) WW (b) WP

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Figure 7

Coulomb force (FE ) (h = 2 cm, l = 0 cm, u0  = 0 m/s, V0  = 20 kV) (a) WW (b) WP

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Figure 8

Swirling flow of air along x-y plane (h = 2 cm, l = 0 cm, u0  = 0 m/s, V0  = 20 kV) (a) WW (b) WP

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Figure 9

Swirling flow (h = 2 cm, l = 0 cm, u0  = 0 m/s, V0  = 20 kV) (a) WW (b) WP

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Figure 10

Swirling flow in case of WW (h = 2 cm, l = 0 cm, V0  = 20 kV) (a) u0  = 0.3 m/s (b) u0  = 0.8 m/s (c) u0  = 1 m/s

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Figure 11

Swirling flow in case of WP (h =  2 cm, l = 0 cm, V0  = 20 kV): (a) u0  = 0.3 m/s (b) u0  = 0.8 m/s (c) u0  = 1 m/s

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Figure 12

x-velocity profile of airflow at V0  = 20 kV and u0  = 0.3 m/s along y-axis on the symmetry plan of the rectangular duct considering at x = 0 m

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Figure 13

Electric fields intensity in various h and electrode arrangement when consider y at the electrode

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Figure 14

Swirling flow of WW at V0  = 20 kV and u0  = 0.5 m/s; (a) h = 2 cm and (b) h = 6 cm

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Figure 15

Swirling flow of WP at V0  = 20 kV and u0  = 0.5 m/s: (a) h = 2 cm and (b) h = 6 cm

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Figure 16

Velocity field ratios when various inlet velocity in case of WW and WP (h = 2 cm, l = 0 cm, V0  = 20 kV)

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Figure 17

Swirling flow of WP at h = 2 cm, V0  = 20 kV and u0  = 0.5 m/s: (a) l = − 5 cm and (b) l = 5 cm

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