Gas hold-up in non-newtonian solutions in a bubble column with internals

Authors

  • Anil K. Pradhan,

    1. Department of Chemical Engineering, University of Calcutta, 92 Acharya P.C. Road, Calcutta 700 009, India
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  • R. K. Parichha,

    1. Department of Chemical Engineering, University of Calcutta, 92 Acharya P.C. Road, Calcutta 700 009, India
    Current affiliation:
    1. Otto India Ltd, Calcutta 700 016
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  • P. De

    Corresponding author
    1. Department of Chemical Engineering, University of Calcutta, 92 Acharya P.C. Road, Calcutta 700 009, India
    • Department of Chemical Engineering, University of Calcutta, 92 Acharya P.C. Road, Calcutta 700 009, India
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Abstract

Bubble characteristics and gas hold-up were studied in a two phase (air-aqueous CMC solution) bubble column provided with helical coils and straight tubes as internals. The effects of superficial gas velocity, rheological properties, and volume fraction covered by the internals, on gas hold-up were studied. Hold-up values determined directly and by simultaneous pressure drop measurements matched well. Enhancement of gas hold-up values up to 55 per cent was achieved in systems using internals. The gas hold-up results were also compared with the values obtained from correlations reported in the literature.

Abstract

On a étudié les caractéristiques des bulles et la rétention de gaz dans une colonne à bulles biphasique (solution aqueuse de CMC-air) munie de serpentins hélǐcoidaux et de tubes verticaux comme structure interne. On a étudié les effets de la vitesse de gaz superficielle, des propriétés rhéologiques et de la fraction de volume occupée par les structures internes sur la rétention de gaz. Les valeurs de rétention déterminées directement et par des mesures de perte de charge simultanées montrent un bon accord. Ľaugmentation des valeurs de rétention de gaz jusq'à 55 p. cent a été réalisée dans les systèmes munis ďune structure interne. Les résultats de rétention de gaz ont également été comparés aux valeurs obtenues à partir de corrélations parues dans la littérature scientifique.

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