Asymmetric deformation of bubble shape ? cause or effect of vortex shedding?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F12%3A86084805" target="_blank" >RIV/61989100:27360/12:86084805 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Asymmetric deformation of bubble shape ? cause or effect of vortex shedding?

Popis výsledku v původním jazyce

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 ofthe data indicate that the bubble inclination, ?, is harmonically oscillating with frequency 5 10 Hz, cross correlation shows that shift of the center of mass ?x to the lower side as well as the horizontal velocity increase with increasi

Název v anglickém jazyce

Asymmetric deformation of bubble shape ? cause or effect of vortex shedding?

Popis výsledku anglicky

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 ofthe data indicate that the bubble inclination, ?, is harmonically oscillating with frequency 5 10 Hz, cross correlation shows that shift of the center of mass ?x to the lower side as well as the horizontal velocity increase with increasi

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

<a href="/cs/project/GA104%2F07%2F1110" target="_blank" >GA104/07/1110: Hydrodynamika a transportní jevy ve vícefázových soustavách: od mikroměřítka k makroměřítku</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

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

ISBN

978-80-905035-1-9

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

"'D1.2' 1@@@###"," 'D1.2' 8"

Název nakladatele

Orgit

Místo vydání

Praha

Místo konání akce

Praha

Datum konání akce

25. 8. 2012

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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