Effect of the multiphase stage flow path dimensions on the bubble diameter in a gas-liquid mixture

The paper presents equations that are making it possible to assess an increase in the free gas bubbles average diameter under the action of centrifugal and Coriolis forces during the gas-liquid mixture motion in the impeller channels of the centrifugal, diagonal and axial stages. An increase in pressure, length, number of blades in the impeller and in the free gas bubbles average diameter at the inlet leads to the growing separation in the radial and tangential directions, free gas concentration in separate areas and, ultimately, to coalescence and increase in the bubbles average diameter. An increase in the working fluid flow rate and viscosity leads to a decrease in these processes. When designing and developing the multiphase pumps, these systems should be multistage, with short stages having a relatively low pressure, and, accordingly, small radial overall dimensions. The smaller the stage diametrical and axial dimensions, the better for its operation on a gas-liquid mixture. The paper shows that the diagonal-type multiphase stages with the inclined-cylindrical and helical blades compared to the axial-type stages in the operating range have higher pressure when working on liquid without gas and gas-liquid mixture, especially in the multistage design. However, the relative decrease in pressure when operating on the gas-liquid mixture is higher for the diagonal-type stages. A multiphase pump should have several stages when operating on the coarsely dispersed gas-liquid mixtures and using the high-pressure diagonal stages.
EDN: TKBZPM, https://elibrary/tkbzpm

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