Frictional loss in multiplate bubble columns

Abstract

Gas holdup and pressure loss were measured for various gas-liquid systems in a batch, multistage bubble column. Experimental results show that the use of screen plates (a = 0.64) considerably increases the gas holdup but introduces a significant pressure loss for the two-phase mixture. The pressure loss was found to be independent of physical properties of the mixture, and predictable either from the modified separated flow model or from the kinetic energy loss based on the liquid circulation velocity. .--.__ -~ On a mesurC la retention de gaz et la perte de charge pour diffkrents systtmes gaz-liquide dans une colonne B bulles multi-etagees en rCgime discontinu. Les resultats expkrimentaux montrent que I'utilisation de plateaux B grilles (a = 0,64)augmente considtrablement la retention de gaz mais introduit une perte de charge importante pour le melange biphasique. II apparait que la perte de charge est independante des proprittks physiques du melange et qu'elle peut &re prtdite B partir du modtle d'dcoulement stpare modifik (Chen et coll., 1986) ou encore de la perte d'energie cinetique baste sur la vitesse de circulation du liquide.Keywords: multiplate bubble column, screen plates, bubble column, holdup, friction t has been reported (Schugerl et al., 1977;Shah et al.,

Characteristics of reciprocating screen-plate bubble column with dilute alcohol solutions

“…However, this effect nearly disappears as the concentration rises to above 0.8 % . Similar observations were reported by other investigators (Kelkar et al, 1983;Chen and Wakao, 1988).…”

Parameters measurement of hydrodynamics and CFD simulation in multi‐stage bubble columns

“…So, most researchers focused on the hydrodynamic behaviour in multi-stage bubble columns, especially gas holdups. Chen and Wakao [16] measured gas holdup and pressure loss for various gas-liquid systems in a batch multi-stage bubble column, and how the use of screen plates considerably increases the gas holdup but also introduces a significant pressure loss for the twophase mixture. Dreher and Krishna [8] reported an increase in gas cap with increasing superficial gas velocity.…”