Oscillation of the shape of rising bubbles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F08%3A00019418" target="_blank" >RIV/61989100:27360/08:00019418 - 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

Oscillation of the shape of rising bubbles

Popis výsledku v původním jazyce

40 years ago, Wellek studied the shape of rising drops in immiscible liquid. The shape of drops was found to be essentially close to an oblate ellipsoid, and the ratio of vertical and horizontal dimension of the side projection of drops was determined asa function of Eötvös number. Resulting well known correlation is also frequently used to predict the shape of medium size so called ellipsoidal bubbles (for air-water system volume of the bubbles 10-500 mm3). By image analysis of records of rising bubbles, obtained using a high speed video camera, time series of characteristic parameters of the bubble projection were obtained. Model of oblate ellipsoid is quite satisfactory. However, unlike the drops, rising bubbles are significantly wobbling and evidently, the ellipsoid and all geometry parameters of its projection change as well. Two motions can be distinguished, i.e. slow rotation about a vertical axis, and harmonic wobbling about a horizontal axis. We have developed a mathematical

Název v anglickém jazyce

Oscillation of the shape of rising bubbles

Popis výsledku anglicky

40 years ago, Wellek studied the shape of rising drops in immiscible liquid. The shape of drops was found to be essentially close to an oblate ellipsoid, and the ratio of vertical and horizontal dimension of the side projection of drops was determined asa function of Eötvös number. Resulting well known correlation is also frequently used to predict the shape of medium size so called ellipsoidal bubbles (for air-water system volume of the bubbles 10-500 mm3). By image analysis of records of rising bubbles, obtained using a high speed video camera, time series of characteristic parameters of the bubble projection were obtained. Model of oblate ellipsoid is quite satisfactory. However, unlike the drops, rising bubbles are significantly wobbling and evidently, the ellipsoid and all geometry parameters of its projection change as well. Two motions can be distinguished, i.e. slow rotation about a vertical axis, and harmonic wobbling about a horizontal axis. We have developed a mathematical

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

2008

Kód důvěrnosti údajů

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

Název statě ve sborníku

Hydrodynamic Processes CHISA 2008

ISBN

978-80-02-02050-9

ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

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Název nakladatele

Process Engineering Publisher, Ing. Jan Novosad

Místo vydání

Praha, Česká republika

Místo konání akce

Praha, Česká republika

Datum konání akce

24. 8. 2008

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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