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  • 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 based on 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 estimate of bubble fron
  • 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 based on 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 estimate of bubble fron (en)
Title
  • Shape and rising velocity of bubbles
  • Shape and rising velocity of bubbles (en)
skos:prefLabel
  • Shape and rising velocity of bubbles
  • Shape and rising velocity of bubbles (en)
skos:notation
  • RIV/61989100:27360/09:00022399!RIV10-GA0-27360___
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  • P(GA104/07/1110)
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  • 341026
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  • RIV/61989100:27360/09:00022399
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  • rising bubbles; ellipsoidal bubbles; surface tension (en)
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  • [48054280A76C]
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  • Hotel Hutník, Tatranské Matliare, Slovakia
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  • Bratislava
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  • 36th International Conference of Slovak Society of Chemical Engineering
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  • Večeř, Marek
  • Wichterle, Kamil
  • Smutná, Kateřina
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number of pages
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  • Slovak Society of Chemical Engineering,
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  • 978-80-227-3072-3
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  • 27360
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