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An intermittent flow structure in airlift pump by using an annular venturi injector
Author(s): Zhineng Wang, Yashi Liao, Xiaochuan Wang
Keywords: Airlift pump; Venturi injector; Flow structure; Three-phase flow
An annular venturi injector (AVI) was proposed to form an intermittent flow structure in airlift pump for a good pump performance. Experiments were conducted to investigate the performance of the airlift pump with such an AVI by comparing with those of the traditional axial and radial injectors, at a series of air flow rates . It was found that airlift pump with AVI had a higher flow rates of output liquid and particles, than those with the traditional injectors. This AVI promoted the gas core to collapse and formed an intermittent flow structure in rising pipe. For this intermittent structure, its slug length firstly increased with gas flow rate and then remain it even under a high gas flow rate, while its slug frequency decreased with gas flow rate and then remain to a minimal value under a high gas flow rate.