Oscillation Frequency of Bubbles Moving Periodically in Various Liquids

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F08%3A00019453" target="_blank" >RIV/61989100:27360/08:00019453 - 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 Frequency of Bubbles Moving Periodically in Various Liquids

Popis výsledku v původním jazyce

Experimental study of bubble motion in downward liquid flow is provided in the contribution. We concentrate on medium sized bubbles (de = 5 ? 9 mm) in various liquids. The bubbles have rising velocities of 0.15?0.25 m s-1. Therefore, bubbles can be observed only limited time in stagnant liquids. To overcome this limitation, a counterflow experimental apparatus is employed. Under such circumstances, bubble levitates in the counterflow and its motion is recorded by a high speed camera. Two perpendicular projections of the measuring section are obtained by means of a mirror. Continous phases are water, glycerol solution (67 wt.%), and polyacrylamide solution (0,25 wt.%). Dispersed phase is air. Corresponding Eötvös number (describing bubble deformation) falls in the range of 3 to 11. Flow regime is characterised by Reynolds numbers of 60 to 1700. Trajectory of the ellipsoidal bubbles is not linear, but someway wavy. This unsteady bubble motion is accompanied by bubble wobbling. Frequency

Název v anglickém jazyce

Oscillation Frequency of Bubbles Moving Periodically in Various Liquids

Popis výsledku anglicky

Experimental study of bubble motion in downward liquid flow is provided in the contribution. We concentrate on medium sized bubbles (de = 5 ? 9 mm) in various liquids. The bubbles have rising velocities of 0.15?0.25 m s-1. Therefore, bubbles can be observed only limited time in stagnant liquids. To overcome this limitation, a counterflow experimental apparatus is employed. Under such circumstances, bubble levitates in the counterflow and its motion is recorded by a high speed camera. Two perpendicular projections of the measuring section are obtained by means of a mirror. Continous phases are water, glycerol solution (67 wt.%), and polyacrylamide solution (0,25 wt.%). Dispersed phase is air. Corresponding Eötvös number (describing bubble deformation) falls in the range of 3 to 11. Flow regime is characterised by Reynolds numbers of 60 to 1700. Trajectory of the ellipsoidal bubbles is not linear, but someway wavy. This unsteady bubble motion is accompanied by bubble wobbling. Frequency

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

35th International Conference of Slovak Society of Chemical Engineering

ISBN

978-80-227-2903-1

ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

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Název nakladatele

Slovak Society of Chemical Engineering,

Místo vydání

Bratislava

Místo konání akce

Tatranské Matliare, Slovakia

Datum konání akce

26. 5. 2008

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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