Flame propagation along a vortex axis

Ishizuka, Satoru

doi:10.1016/s0360-1285(02)00019-9

Cited by 84 publications

(51 citation statements)

References 110 publications

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“…While being a novel concept at present, the introduction of VB to bioreactor flows is likely to be a favorable step. The successful incorporation of VB into industrial flame control processes (see review by Ishizuka (2002)) illustrates its potential to be used as a mixing control mechanism in swirling flow applications. However, in order to be successfully applied to cell culture mixing vessels, the VB phenomenon requires further investigation in terms of properties relevant to the application, such as local stress conditions and the relationship between the VB region and the remainder of the flow.…”

Section: Introductionmentioning

confidence: 99%

A fluid dynamics approach to bioreactor design for cell and tissue culture

Dusting

Sheridan

Hourigan

2006

Biotech & Bioengineering

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The problem of controlling cylindrical tank bioreactor conditions for cell and tissue culture purposes has been considered from a flow dynamics perspective. Simple laminar flows in the vortex breakdown region are proposed as being a suitable alternative to turbulent spinner flask flows and horizontally oriented rotational flows. Vortex breakdown flows have been measured using three-dimensional Stereoscopic particle image velocimetry, and non-dimensionalized velocity and stress distributions are presented. Regions of locally high principal stress occur in the vicinity of the impeller and the lower sidewall. Topological changes in the vortex breakdown region caused by an increase in Reynolds number are reflected in a redistribution of the peak stress regions. The inclusion of submerged scaffold models adds complexity to the flow, although vortex breakdown may still occur. Relatively large stresses occur along the edge of disks jutting into the boundary of the vortex breakdown region.

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Section: Introductionmentioning

confidence: 99%

A fluid dynamics approach to bioreactor design for cell and tissue culture

Dusting

Sheridan

Hourigan

2006

Biotech & Bioengineering

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“…It is known that propagation of premixed flames in vortices can be significantly faster than that in non-rotating flows [25,26]. In his review article, Ishizuka [27] discusses different mechanisms of this enhancement of flame propagation. In particular, Ishizuka [27] highlights the mechanism of "flame back pressure" which involves a boosted flame propagation supported by an aerodynamic force.…”

Section: Introductionmentioning

confidence: 99%

“…In his review article, Ishizuka [27] discusses different mechanisms of this enhancement of flame propagation. In particular, Ishizuka [27] highlights the mechanism of "flame back pressure" which involves a boosted flame propagation supported by an aerodynamic force. This mechanism can be, simply, explained as follows.…”

Section: Introductionmentioning

confidence: 99%

“…As a result the negative centrifugal forces in the burned region, are weaker in comparison with those in the upstream unburned flow. Hence, the low pressure generated by the rotation of the flow is partially suppressed, which causes a rise in the static pressure across the reactive front [27,28]. This is clearly distinctive with the situation encountered in the non-rotating deflagration waves, in which there is always a drop of static pressure across the flame [29].…”

Section: Introductionmentioning

confidence: 99%

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Generation of Adverse Pressure Gradient in the Circumferential Flashback of a Premixed Flame

Karimi

McGrath

Brown

et al. 2016

Flow Turbulence Combust

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Circumferential upstream propagation of a premixed flame in a region confined between two concentric tubes is considered. The cold flow in this configuration features rotational motion and the flame is modelled as an interface separating the burned and unburned gases. Through an analytical solution of the integral form of the governing equations, it is shown that the static pressure increases across the flame. Hence, the circumferential propagation of the flame is associated with the generation of an adverse pressure gradient. The theoretical prediction of the pressure increase is, further, supported by the experimental observations and discussed in the context of the theory of flame back pressure. The results extend the recent findings on the generation of adverse pressure gradient during the axial propagation of swirling flames, to the circumferential direction. It is argued that the demonstrated pressure gain across the flame can significantly facilitate flame flashback.

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“…flame interaction with turbulent vortices [8][9][10][11], intrinsic flame instabilities [2,[12][13][14][15], ignition peculiarities [16,17], flame-acoustic interactions [18,19], etc. It is however noted that, for flames in tubes/channels, the role of turbulence and flame instabilities is rather supplementary as compared to either the Shelkin mechanism in smooth tubes [3,7,[20][21][22][23][24] or acceleration in tubes with obstacles [25,26].…”

Section: Introductionmentioning

confidence: 99%

Analysis of flame acceleration induced by wall friction in open tubes

2010

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Spontaneous flame acceleration leading to explosion triggering in open tubes/channels due to wall friction was analytically and computationally studied. It was first demonstrated that the acceleration is effected when the thermal expansion across the flame exceeds a critical value depending on the combustion configuration. For the axisymmetric flame propagation in cylindrical tubes with both ends open, a theory of the initial (exponential) stage of flame acceleration in the quasi-isobaric limit was developed and substantiated by extensive numerical simulation of the hydrodynamics and combustion with an Arrhenius reaction. The dynamics of the flame shape, velocity, and acceleration rate, as well as the velocity profile ahead and behind the flame, have been determined.

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Flame propagation along a vortex axis

Cited by 84 publications

References 110 publications

A fluid dynamics approach to bioreactor design for cell and tissue culture

A fluid dynamics approach to bioreactor design for cell and tissue culture

Generation of Adverse Pressure Gradient in the Circumferential Flashback of a Premixed Flame

Analysis of flame acceleration induced by wall friction in open tubes

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