Theory of the vortex breakdown phenomenon
Webb10 apr. 2024 · This includes an investigation into nonlinear phenomena that arise in such diverse areas as semiconductor laser theory, nonlinear and fiber optics, surface water waves, acoustic waves and gas lasers. Although these topics are seemingly disconnected and have different physical characteristics, they all can be viewed as complex systems … Webb1 juli 1983 · These two zones are separated by a layer of rotational fluid originating in the upstream vortex core. An outline is given of the analysis for an upstream flow modelled as a Rankine vortex. It is ...
Theory of the vortex breakdown phenomenon
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Webb1 feb. 1987 · Abstract. A criterion for the onset of vortex breakdown is proposed. Based upon previous experimental, computational, and theoretical studies, an appropriately defined local Rossby number is … Webb11 apr. 2024 · Topics of interest are evolution and interaction of waves in reactive media, combustion and vortex breakdown in swirling flows, and transition from deflagration to detonation in granular explosives. Recent studies have focused on the development and analysis of multi-phase and multi-physics models of confined granular explosives, both …
Webb8 juni 1998 · Nozzles with the inclined angle of 5°, 10°, 20°, and 45° were considered, and the Reynolds number of the flow ranged from 1447 to 4824. The L/D was varied from 0.77 to 1.92, where L is the length of the slug of fluid ejected through the nozzle of diameter D. The results showed that when inclined vortex rings were formed, they were subjected ... Webb1 jan. 1988 · Some three decades have elapsed since the phenomenon of vortex breakdown was first observed in the leading-edge vortices trailing from delta wings. …
Webb29 mars 2006 · The type and the location of the stationary breakdowns were found to be dependent, for the particular vortex tube used, upon the Reynolds and circulation … WebbBy theory of the authors on this subject. The simvirtue of the axisymmetry, a stream function ulations fully match with the predictions of the ^(x, r, t) can be denned where the radial corntheory and provide insight into the mechanism ponent of velocity u = -VW< and the axleading to the vortex breakdown phenomenon ial component of velocity w = ^r/r.
WebbEach of these theories offer insight into fa-cets of vortex breakdown, but none adequately describes both the occurrence and topology of breakdown. Additionally, a necessary limitation of many of the theories to date has been the as-sumption of axisymmetric flow. Although the bubble form of breakdown is largely axisymmet-
WebbVortex breakdown is a phenomenon inherent to many practical problems, such as leading-edge vortices on aircraft, atmospheric tornadoes, and flame-holders in combustion … chkdsk how many stagesWebbTheory of the vortex breakdown phenomenon. The phenomenon examined is the abrupt structural change which can occur at some station along the axis of a swirling flow, … grassner consultingWebb13 apr. 2024 · Since the phenomenon depends on the electrostatic interaction between cell and surface, we expect that higher salt concentrations would screen the electrostatic interaction, reducing the effect. To demonstrate this, we conduct experiments with saltwater Nannochloropsis oculata, which are cultured in Erdschreiber's medium (0.6 m ). grass n bone mystic ctWebb1 jan. 2001 · Leibovich [7] describes a vortex breakdown as a change in structure of a vortex initiated by a variation in the characteristic ratio of tangential to axial velocity components. Although early experimental investigations of vortex breakdown were carried out in flows over delta wings, there was a need for more controlled conditions. grass nearlyWebbCiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): A recent theory of the nearly axisymmetric vortex breakdown in a pipe is presented. We study the motion of an axisymmetric and inviscid swirling flow in a pipe with certain boundary conditions that may reflect the physical situation. The theory is built of global analysis of … grass native to texas panhandleWebb11 apr. 2024 · This vortex (or lift dependent) drag is difficult to quantify for the whole vehicle, for reasons that are discussed. It has previously been shown that vortex drag may be assessed for some car ... grass naples homes for saleWebb8 aug. 2024 · The surface morphology of fractures formed by hydraulic fracturing is usually rough. The roughness of the fracture surface is the main reason the actual fracture conductivity deviates from the ideal flat plate model result. In this paper, based on the three-dimensional reconfiguration of actual rough hydraulic fractures, a randomly … chkdsk index verification completed hang