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Experimental study has been aimed at examining the flow regimes of gas–liquid in up-flow ejectors by planar laser induced fluorescence (PLIF) technology under air–water and carbon dioxide–water system, the velocity fields by particle image velocimetry (PIV) under carbon dioxide–water system and gaining the bubble photos under air–water system. The conclusions were as follows: (1) The PLIF experimental results showed that in the absence of swirl, the liquid formed and maintained jet in the lower part of ejector and the air flowed up around the liquid jet annularly. At some point along the ejector axis, the jet broke up and the gas dispersed into small bubbles in the liquid. In the presence of swirl, the liquid jet didn’t exist any longer and the two phases interpenetrated and diffused immediately when two phases contact each other. (2) In the PIV measurements, the experimental data showed that at steady state the gas bubbles in the liquid flowed up along the axial direction or paralleled to the wall without swirl. However, the existence of swirl makes the velocity vectors of gas bubbles rotated and flowed up with some extent helicity. (3) The bubble photos showed that at low G/L the bubbles in the presence of swirl form the bubble chain while in the absence of swirl the bubbles disperse uniformly. However, when the G/L ratio increases, the difference in the bubble distribution diminish and the bubble tend to fill of the whole diffuser of the ejector with and without swirl.

Experimental Measurement of Gas-Liquid Flow Field in Up-Flow Ejectors with and without Swirl