Vortex amplifier internal geometry and its effect on performance

King, C. F.

doi:10.1016/0142-727x(85)90004-9

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…71, which is consistent with previous findings (Brombach, 1972;King, 1985;Priestman, 1987;Zobel, 1936). This indicates a transition away from the freevortex behaviour, in which the circulation remains constant, which is normally expected in the vortex tail region…”

supporting

confidence: 83%

“…Previous researchers have recommended vortex valve geometries that maximise the head loss at a given flow rate (Brombach, 1972;King, 1985;Priestman, 1987;Wojtowicz and Kotowski, 2009;Zobel, 1936). However, maximising the head loss of the VFC is not always desirable as this can over-restrict the flow and increase the flood risk on the upstream catchment.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of vortex flow controls at high drainage flow rates

Jarman¹,

Butler

Tabor

et al. 2015

Proceedings of the Institution of Civil Engineers - Engineering

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A number of vortex flow control (VFC) devices for urban drainage systems are investigated computationally at high flow rates, for which a confined vortex dominates the flow regime. A range of turbulence models, including both eddy viscosity and Reynolds stress closures, are compared with in-house experimental measurements of head loss and internal pressure measurements. Single-phase and multi-phase (free surface) calculations are also compared. Very good agreement with the experimental data was obtained when the swirl parameter of the device was below 3 . 14 for predictions made using the Reynolds stress closure formulations. For devices with swirl parameters above this value, the computational methodology was found to under-predict the head loss of the device. This was attributed to poor calibration of the turbulence model for swirling flow scenarios in which the pressure gradient and diffusive (turbulent) forces in the flow are comparable.

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supporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Modelling of vortex flow controls at high drainage flow rates

Jarman¹,

Butler

Tabor

et al. 2015

Proceedings of the Institution of Civil Engineers - Engineering

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“…This is primarily due to the increasing significance of pressure drop in the supply ports as their overall area approaches the supposed minimum area of the exit port. However, other studies [31,32] showed no effect of reducing supply area on the critical pressure ratio (within the geometrical limitations of a serious device). When increasing the supply port area, it is known [14] that up to 50 per cent of the vortex chamber annulus can be cut away (to form supply ports) without a significant effect on axi-symmetric flow or substantial increase in noise.…”

Section: Vxa S In Other Applicationsmentioning

confidence: 96%

“…In contrast, a reduction in the control port area (for a set exit port area) improves the turn-down ratio [14,21,32]. However, this action also increases the critical pressure ratio, but optimum ratios of control port area to exit port area (Ac/Ae) have been derived in the region of 0.3 [32,33]. The type of diffuser connected to the exit port is also important.…”

Section: Vxa S In Other Applicationsmentioning

confidence: 99%

Case study: Vortex amplifier assemblies for glovebox applications containing radiological hazard

Francis

Zhang

Parker³

2011

Proceedings of the Institution of Mechanical Engineers, Part E:

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Operation of gloveboxes containing radiological hazards relies on risks being broadly acceptable. Worker protection is maintained in the event of damage to the containment wall or gloves by a vortex amplifier (VXA). The most recent gloveboxes to be made active at the Sellafield site are protected by a 'Mini-VXA', which is a geometrically scaled down version of the previous standard version. This article describes the assembly that incorporates the mini-VXA. It traces the major innovations in VXA system technology that have been employed on alpha gloveboxes at Sellafield since 1970, culminating in the discovery of high levels of O 2 in gloveboxes protected by the mini-VXA during commissioning of same. Laboratory tests and field trials are reported that were aimed at overcoming the unexpectedly high demand of the mini-VXA for inert gas; and the solution eventually adopted.

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

Francis

Parker²,

Whitty

et al. 2014

Journal of Fluids Engineering

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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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Vortex amplifier internal geometry and its effect on performance

Cited by 4 publications

References 4 publications

Modelling of vortex flow controls at high drainage flow rates

Modelling of vortex flow controls at high drainage flow rates

Case study: Vortex amplifier assemblies for glovebox applications containing radiological hazard

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

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