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| rdf:type
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| Description
| - Two perpendicular projections of rising bubbles were observed in countercurrent downstream diverging flow. Evidently, the bubbles did not enter the boundary layer at the channel wall and plug liquid flow assumption was acceptable in our experimental equipment. It proved that this experiment is adequate for simulation of bubble rise in quiescent liquid column. Recent data taken by high speed camera Olympus allowed a period 60 seconds to be recorded. Image analysis by tailor-made program provides time series of quantities related to the position, size, and shape of bubbles. Besides determination of the aspect ratio of equivalent oblate ellipsoid, deviation from this shape has been investigated in sense of the parameters shown in Fig.1. Autocorrelation of the data indicate that the bubble inclination, α, is harmonically oscillating with frequency 5 10 Hz, cross correlation shows that shift of the center of mass Δx to the lower side as well as the horizontal velocity increase with increasing α, Δz increases with increasing |α|, and there is not any significant phase shift in oscillation of these quantities. Bulky bottom side of bubbles is in accordance with the model of bubble oscillation induced by instability of equilibrium of gravity and surface tension forces. Dependence of the oscillation frequency on surface forces (Eötvös number) is evident, while viscosity does not play role. Therefore vortex shedding likes to be an effect of the oscillation and not its cause.
- Two perpendicular projections of rising bubbles were observed in countercurrent downstream diverging flow. Evidently, the bubbles did not enter the boundary layer at the channel wall and plug liquid flow assumption was acceptable in our experimental equipment. It proved that this experiment is adequate for simulation of bubble rise in quiescent liquid column. Recent data taken by high speed camera Olympus allowed a period 60 seconds to be recorded. Image analysis by tailor-made program provides time series of quantities related to the position, size, and shape of bubbles. Besides determination of the aspect ratio of equivalent oblate ellipsoid, deviation from this shape has been investigated in sense of the parameters shown in Fig.1. Autocorrelation of the data indicate that the bubble inclination, α, is harmonically oscillating with frequency 5 10 Hz, cross correlation shows that shift of the center of mass Δx to the lower side as well as the horizontal velocity increase with increasing α, Δz increases with increasing |α|, and there is not any significant phase shift in oscillation of these quantities. Bulky bottom side of bubbles is in accordance with the model of bubble oscillation induced by instability of equilibrium of gravity and surface tension forces. Dependence of the oscillation frequency on surface forces (Eötvös number) is evident, while viscosity does not play role. Therefore vortex shedding likes to be an effect of the oscillation and not its cause. (en)
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| Title
| - Asymmetric deformation of bubble shape – cause or effect of vortex shedding?
- Asymmetric deformation of bubble shape – cause or effect of vortex shedding? (en)
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| skos:prefLabel
| - Asymmetric deformation of bubble shape – cause or effect of vortex shedding?
- Asymmetric deformation of bubble shape – cause or effect of vortex shedding? (en)
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| skos:notation
| - RIV/61989100:27360/12:86084805!RIV13-GA0-27360___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
| |
| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
| |
| http://linked.open...iv/duvernostUdaju
| |
| http://linked.open...titaPredkladatele
| |
| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/61989100:27360/12:86084805
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - surfaces; oscillation; shape; bubble (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
| |
| http://linked.open...v/mistoKonaniAkce
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| http://linked.open...i/riv/mistoVydani
| |
| http://linked.open...i/riv/nazevZdroje
| - 20th International Congress of Chemical and Process Engineering CHISA 2012 and 15th Conference PRES 2012 : CD-ROM of full texts : 25-29 August 2012, Prague, Czech Republic
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| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
| |
| http://linked.open...iv/tvurceVysledku
| - Večeř, Marek
- Wichterle, Kamil
- Ruzicka, M. C.
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| http://linked.open...vavai/riv/typAkce
| |
| http://linked.open.../riv/zahajeniAkce
| |
| number of pages
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| http://purl.org/ne...btex#hasPublisher
| |
| https://schema.org/isbn
| |
| http://localhost/t...ganizacniJednotka
| |
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