Shape and rising velocity of bubbles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F09%3A00022399" target="_blank" >RIV/61989100:27360/09:00022399 - 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

Shape and rising velocity of bubbles

Popis výsledku v původním jazyce

Common medium-size bubbles that are produced by breakup of gas stream (for air-water system volume of such bubbles is 10-500 mm3) are mostly like oblate ellipsoids and their rising path is somewhat helical. Correlations presented in this paper are basedon records of rising bubbles, obtained using a high speed video camera. Shape of a bubble and its velocity was determined from time series of characteristic parameters of the bubble projection obtained by image analysis. For this purpose, we have developed a mathematical model of the bubble image including three parameters: eccentricity of the ellipsoid, amplitude of the wobbling, and angular rotation. For different low- and medium-viscosity liquids, eccentricity of the ellipsoids approximating the bubble shape is a function of Eötvös number, viscosity effect being negligible. On the other side, the bubble rising velocity depends both on viscosity and surface tension. However, the effect of surface tension may be included to the estimat

Název v anglickém jazyce

Shape and rising velocity of bubbles

Popis výsledku anglicky

Common medium-size bubbles that are produced by breakup of gas stream (for air-water system volume of such bubbles is 10-500 mm3) are mostly like oblate ellipsoids and their rising path is somewhat helical. Correlations presented in this paper are basedon records of rising bubbles, obtained using a high speed video camera. Shape of a bubble and its velocity was determined from time series of characteristic parameters of the bubble projection obtained by image analysis. For this purpose, we have developed a mathematical model of the bubble image including three parameters: eccentricity of the ellipsoid, amplitude of the wobbling, and angular rotation. For different low- and medium-viscosity liquids, eccentricity of the ellipsoids approximating the bubble shape is a function of Eötvös number, viscosity effect being negligible. On the other side, the bubble rising velocity depends both on viscosity and surface tension. However, the effect of surface tension may be included to the estimat

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

2009

Kód důvěrnosti údajů

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

Název statě ve sborníku

36th International Conference of Slovak Society of Chemical Engineering

ISBN

978-80-227-3072-3

ISSN

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e-ISSN

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Počet stran výsledku

12

Strana od-do

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Název nakladatele

Slovak Society of Chemical Engineering,

Místo vydání

Bratislava

Místo konání akce

Hotel Hutník, Tatranské Matliare, Slovakia

Datum konání akce

25. 5. 2009

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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