Bubble flow, pulse flow and spray flow are the identified flow regimes for cocurrent upflow of air and water through a bed of ceramic spheres. Criteria for transition from one regime to another are presented. Pressure drop for the two phase flow is experimentally measured and the two phase friction factor is correlated as f KRe m g Re ÿ n 1 d p = d c 1:5 where (m, n) are respectively (0.18, 1.7), (0.26, 1.7) and (1.12, 1.82) corresponding to bubble flow, pulse flow and spray flow regimes. List of symbols a s specific surface area of the packing, m )1 d p particle diameter, m d c column diameter, m f friction factor, (-) eqn. (6) f(th) friction factor, (-) eqn. (e)Table 1 G gas mass flux, kg/m 2 s g acceleration due to gravity, m/s 2 h distance between the pressure taps, m k number of data points L liquid mass flux, kg/m 2 s ∆P pressure drop, N/m 2 Re
Interfacial area is measured for a large range of column packing (Raschig rings, Intalox saddles, and two sizes of spheres) for concurrent gas-liquid upflow through packed bed covering bubble, pulse and early spray flow regimes using air-aqueous sodium sulfite solution. It was observed that the interfacial area increased with increase in fluids flow rate and decreased with the increase in the particle size for the same type of packing. A correlation (3 ≤ Re l ≤ 165, 0.5 ≤ Re g ≤ 210) was developed using present data (120 data points) and literature data (100 data points), which predict the interfacial area with an rms deviation of 16%.La zone interfaciale est mesurée pour une vaste gamme de remplissage (anneaux de Raschig, selles Intalox et deux tailles de sphères) pour un courant ascendant gaz-liquide simultané dans un lit fixe couvrant les régimes de bulles, d'impulsions et de flux de pulvérisation précoces au moyen d'une solution de sulfite de sodium atmosphérique-aqueuse. On a observé que la zone interfaciale s'accroissait avec l'augmentation du débit des fluides et diminuait avec l'augmentation de la taille des particules pour le même type de remplissage. Une corrélation (3 ≤ Re l ≤ 165, 0.5 ≤ Re g ≤ 210) aété créée au moyen des données actuelles (120 points de données) et des données de la littérature (100 points de données) qui prédisent la zone interfaciale présentant unécart-type de 16%.
he two-phase pressure drop for concurrent gas-liquid upflow through packed beds depends on the physical properties, flow rates The present study aims at better understanding of the influence of liquid viscosity on two-phase pressure drop, and for this purpose experiments were conducted with air-water and air-Monoethanolamine (MEA) as gas-liquid systems with ceramic spheres and Berl Saddles as column packing ( Table 1 ). The experimental details were presented elsewhere (Ahamed Khan, 1998; Khan et al., (1 997). The gas and liquid flow rates are such that they covered the bubble flow, pulse flow and spray flow regimes. Figures 1 and 2 show the variation of two-phase pressure drop with the gas and liquid flow rates for the two chosen gas-liquid systems and the type of column packing. It is noted that the pressure drop increases with increase in the flow rates of either of the fluids or a decrease in bed porosity. With respect to the influence of the viscosity, the two-phase pressure drop is marginally higher for air-water system than for air-MEA system at low liquid rates; a reverse It was observed in the experimental investigations that the concurrent upflow of air-Monoethanol amine system through the packed bed gave higher pressure drop in bubble flow regime than the air-water system. But when the flow regime changed to spray flow, air-water system showed higher pressure drop than the other. This phenomenon was observed for the two column packing used in this study. An attempt is made to explain this phenomenon.On a observk exp4rirnentalement que la perte de charge dans I'koulement ascendant a co-courant du systeme air-mondthanolamine dans un lit gami Ctait plus grande dans le *ime d'koulement a bulles que dans le systeme air-eau rnontre une plus grande perte de charge que pour le *ime a bulles. Ce phCnomene a 6te observC pour les deux gamissages de colonnes utilises dans cette etude. On tente d'expliquer ce phenomene.
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