HYDRODYNAMICS AND LOCAL MASS-TRANSFER CHARACTERISTICS OF GAS-LIQUID EJECTORS

The hydrodynamics and mass transfer characteristics of a straight tube ejector have been investigated. From the experiments it can be conclu ded that two different hydrodynamic zones exist in the ejector. In the first zone, the ''mixing shock'' region, extremely high k(L)a values are obtained. In the remaining part of the ejector volume a fine and h omogeneous bubble flow appears in which the mass transfer rate is lowe r. These observations indicate that for a proper design of gas-liquid ejectors the ejector should be considered as a system of two units in series, requiring separate modelling. Further, it has been shown that the presence of a swirl device in the upstream section of the nozzle h as a significant effect on the hydrodynamics and mass transfer perform ance of ejectors.