Identification of Flow Regimes in Slot-Rectangular Spouted Beds using Pressure Fluctuations

Authors

  • Luis A. P. Freitas,

    1. Faculdade de Ciencias Farmaceuticas de Ribeirao Preto, Universidade de Sao Paulo, Via do Café s/n, Ribeirao Preto, S.P., 14040-903, Brazil
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  • Ozkan M. Dogan,

    1. Department of Chemical and Biological Engineering, University of British Columbia, 2216 Main Mall, Vancouver, BC, V6T 1Z4, Canada
    Current affiliation:
    1. Dept. of Chem. Eng., Gazi University, Maltepe, Ankara 06570, Turkey
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  • C. Jim Lim,

    1. Department of Chemical and Biological Engineering, University of British Columbia, 2216 Main Mall, Vancouver, BC, V6T 1Z4, Canada
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  • John R. Grace,

    Corresponding author
    1. Department of Chemical and Biological Engineering, University of British Columbia, 2216 Main Mall, Vancouver, BC, V6T 1Z4, Canada
    • Department of Chemical and Biological Engineering, University of British Columbia, 2216 Main Mall, Vancouver, BC, V6T 1Z4, Canada
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  • Dingrong Bai

    1. Department of Chemical and Biological Engineering, University of British Columbia, 2216 Main Mall, Vancouver, BC, V6T 1Z4, Canada
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Abstract

Pressure fluctuation data recorded in slot-rectangular spouted beds of 1.44 mm diameter glass beads were analyzed with the aid of statistical and chaotic tools. The column width was maintained at 150 mm, while the thickness and slot width were both varied. It is shown that there are significant shifts in both statistical and chaos measures as the gas flow rate is increased. The results suggest that pressure fluctuations can be used to provide diagnostics of flow regime transitions in spouted beds when viewing is impossible.

Abstract

Des données de fluctuation de pression enregistrées dans des lits jaillissants rectangulaires à fentes contenant des billes de verre de 1,44 mm de diamètre ont été analysées au moyen d'outils statistiques et chaotiques. La largeur de la colonne a été maintenue à 150 mm, tandis qu'on a fait varier l'épaisseur et la largeur de fente. On montre qu'il y a des différences importantes entre les mesures statistiques et les mesures du chaos lorsque le débit de gaz augmente. Ces résultats montrent que les fluctuations de pression peuvent fournir des diagnostics sur les transitions de régime d'écoulement dans les lits jaillissants lorsque les observations visuelles sont impossibles.

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