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The hydrodynamics of a 5-cm reciprocating-plate Karr column used for cocurrent gas-liquid contact were studied over the ranges 0 < AF < 10 cm/s, 0 < VL < 6 cm/s, and 0 < Vg < 14.3 cm/s. The frictional loss is closely related to the liquid circulation within the column. The plate reciprocation shows little influence on the gas holdup until it reaches a critical value. The column can generate bubbles of average diameter between 3 and 6 mm and an interfacial area approximately 3 times that found in bubble columns under otherwise the same operating conditions.

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Gas holdup and pressure drop measurements were made in two multistage bubble columns. Plates made from 6 mesh/in screen (a = 0.64) and those of Karr design (a = 0.53) were tested. An improved separated-flow model was developed for correlating the two-phase friction losses over the ranges: 0 C V, C 8.22 cm/s and 0 C V L 6 6.12 cm/s. This model was also sound for the vibrating disk column introduced by Tojo et al. (1974).Empirical correlations are presented for the gas holdup and the pressure drop due to liquid circulation within these two columns.Des mesures de rktention des gaz et de perte de charge ont CtC effectutes dans deux colonnes a bulles a Ctages multiples. Des plateaux faits d'un tamis de 6 mailles/po (a = 0.64) et des plateaux de type Karr (a = 033) ont CtC testes. Un modkle amCliore avec stparation des Ccoulements a ete Ctabli pour exprimer les pertes par friction d'un Ccoulement biphasique sur les gammes suivantes: 0 6,12 cm/s. Ce modtle s'est Cgalement avCrC applicable pour la colonne a disques vibrCs proposCe par Tojo et al. (1974).Des corrklations empiriques sont presentees pour la ritention des gaz et la perte de charge causCes par la circulation liquide a I'intCrieur des deux colonnes. V,8,22 cm/s et 0 G V, he bubble column is a relatively simple and economical