The effect of the local multiphase separation coefficient and free gas content on static head when operating on a gas-liquid mixture

Equations are derived that make it possible to estimate, at local multiphase coefficients specified for the flow part of the impeller, the change in head and pressure that multiphase blade stages develop when working on a gas-liquid mixture, the speed of liquid and gas phases and the areas occupied by them depending on the physico-chemical properties of the fluid, including the diameter of discrete particles, the content of free gas. Using the example of calculation an axial multiphase stage with local multiphase separation coefficient for the screw impeller, it is shown that the free gas content in the gas-liquid mixture has a negligible effect on the head of the stage, and the diameter of the free gas bubbles is significant. The free gas content has a significant effect on the pressure created by the stage. It is shown that when the ratio of the gas phase slip rate to the liquid phase flow rate tends to unity, a gas plug forms, the relative area occupied by the gaseous phase tends to unity, the gas completely blocks the flow part of the multiphase stage, and the impeller ceases to create pressure and pressure.
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