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Research Papers: Flows in Complex Systems

Control Port Influence on Swirl, Operating, and Flow Characteristics of a Mini-Vortex Amplifier on Glove Box Service

[+] Author and Article Information
J. Francis

John Tyndall Institute,
UCLan Nuclear,
School of Computing, Engineering
and Physical Sciences,
University of Central Lancashire,
Preston PR1 2HE, UK

D. Parker

Telereal Trillium,
140 London Wall,
London EC2Y 5DN, UK

J. Whitty, G. Zhang

John Tyndall Institute,
UCLan Nuclear,
School of Computing, Engineering
and Physical Sciences,
University of Central Lancashire,
Preston PR1 2HE, UK

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 22, 2013; final manuscript received June 28, 2014; published online September 10, 2014. Assoc. Editor: Bart van Esch.

J. Fluids Eng 136(12), 121104 (Sep 10, 2014) (11 pages) Paper No: FE-13-1516; doi: 10.1115/1.4028007 History: Received August 22, 2013; Revised June 28, 2014

Vortex amplifiers (VA) use fluidic phenomena to modify flow through a containment breach, when used to protect glove box workers from exposure to the contents. The influence of control port geometry on swirl, operating characteristics, global flow, and momentum characteristics is studied experimentally. Shape and size of the control flow channels and the pressure applied at the tangential ports are critical in determining the trajectory of the jet issuing from the tangential ports and deflection of radial flow and vortex strength. Dominance of control-to-exit area ratio is confirmed. A clear improvement in performance is noted for a practical geometry derived from shaped passages of the device. Flow and momentum characteristics provide additional design data. The relationship of swirl number to output flow is demonstrated. Global flow and momentum characteristics provide insight into design and operation that is useful when avoiding back diffusion.

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References

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Figures

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Fig. 2

Effect of tangential control pressure on flow [3]

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Fig. 3

2D sketch showing the midplane geometry of the fluid domain (dims in mm)

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Fig. 4

Glove box test rig diagram

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Fig. 5

(a) Operating characteristics with various control port area and (b) scaled operating characteristics with various control port area

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Fig. 6

Scaled operating characteristics with various control port and channel shapes

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Fig. 7

Swirl number generated by control port flow for geometries 7.0–7.4

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Fig. 8

Swirl number inverse relationship with total flow for geometries 7.0–7.4

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Fig. 9

Effect of control-to-exit area ratio on flow coefficient (Cd)

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Fig. 10

Effect of control-to-exit area ratio on momentum interaction characteristics (Ф)

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Fig. 11

Relationship between momentum angle Ф and flow coefficient Cd

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Fig. 12

(a) Effect of exit port area on flow coefficient Cd and (b) scaled effect of exit port area on flow coefficient Cd

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Fig. 13

Effect of area ratios on momentum parameter Ф

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Fig. 14

Fluid regions for geometry 7.0 with curved wall promontories between the supply and control port flow paths

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Fig. 15

Exploded view of supply arrangement to chamber (without spacer plates)

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Fig. 16

(a) Control port insert 7.0 design schematic and (b) control port insert 7.0 general arrangement

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Fig. 17

Control port insert 7.1 design schematic

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Fig. 18

Control port insert 7.2 design schematic

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Fig. 19

Control port insert 7.3 design schematic

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Fig. 20

Control port insert 7.4 design schematic

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Fig. 21

Control port insert 7.0 with modeling clay

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