The effects of ratio of draft tube to reactor diameter (Dd/D), liquid nozzle diameter (dN), aeration tube diameter (dG) and immersion height of the two-fluid nozzle into the draft tube (HN) on overall and annulus gas holdups for the air-water system were evaluated experimentally in a reversed flow jet loop reactor over wide ranges of gas and liquid flow rates. Both the gas holdups increased with increasing gas and liquid flow rates and with decreasing d,,, and HN. The influence of dG on gas holdups is found to vary with gas flow rates. Correlations are proposed to predict gas holdups.Les effets du rapport entre le diambtre du tube d'aspiration et le diambtre du rkacteur (D,lD), le diamktre de la tuykre de liquide (dN), le diambtre du tube d'akration (d,) et la hauteur d'immersion de la tuybre de deux fluides dans le tube d'aspiration (HN) sur la retention de gaz globale et annulaire, ont 6tt 6valuCs de faGon expkrimentale dans un r6acteur B boucle B jet d'6coulement invers6 et pour large Cventail de d6bits de gaz et de liquide, pour le systbme air-eau. Les deux rktentions de gaz ont augment6 avec les dkbits de gaz et de liquide; la m&me tendance est observ6e avec la diminution de dN et HN. On a trow6 que l'influence de dG sur les rktentions de gaz variait avec les dkbits gazeux. Des corrClations sont propos6es pour pr6dire les rktentions de gaz.
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