Gas holdup and hydrodynamic flow regime transition in bubble columns

다국어 초록 (Multilingual Abstract)

The homogeneous-to-heterogeneousflow regime transition point dependence on gas and liquidproperties was investigated in a semi-cylindrical bubble column of 1.8 m height and 0.21 m innerdiameter operating as a semi-batch system. He, air, and CO2 gases were injected at superficial gasvelocities of up to 239 mm/s. The batch liquids included water, aqueous ethanol solutions, and aqueousglycerol solutions, all with a gas-free liquid height settled at 1 m. When the gas density increased, the gasholdup increased at all superficial gas velocities, delaying theflow regime transition. The gas holdups inthe liquid mixtures were higher than those for tap water. The transition gas holdup for the ethanolsolutions increased to a sharp maximum and then decreased as the surface tension increased. Also, theglycerol solutions showed similar behavior with respect to increasing liquid viscosity, but with ashallower maximum. The transition gas holdup was empirically correlated as a function of the gasdensity, surface tension, and liquid viscosity, employing dimensional constants. The measured transitiongas holdups for liquid mixtures, as well as some data from the literature, werefitted by the correlation.

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