Assumption of Basic Conditions for Two Phase Flow of Slurry Pump


May 24,2024

Assumption of Basic Conditions for Two Phase Flow of Slurry Pump

The basic assumptions of two-phase flow in slurry pumps refer to several prerequisites that need to be assumed when studying wear-resistant slurry pumps using two-phase flow theory.


Due to the complex liquid-solid two-phase flow inside the flow field of the slurry pump, there are not only solid particles present, but also dynamic and static interference between the impeller and the pressure chamber, as well as wear issues of the flow components;


The turbulence model and two-phase flow model introduced in the calculation process cannot accurately reflect the real flow situation. In order to simplify the calculation and analysis process without distortion, several ideal limiting conditions need to be met in the flow field.


Assumption of basic conditions for two-phase flow of slurry pump:

1. The main phase (liquid phase) is an incompressible fluid (liquid density is constant), while the secondary phase (solid phase) follows the principle of Euler's continuous medium model, and the physicochemical properties of each phase remain unchanged in the flow;


2. The diameter of solid phase particles satisfies ideal conditions and there is no change in phase state;


3. Assuming that the flow in the slurry pump channel is steady, a multiple coordinate system reference method is used to establish a fixed coordinate system on the pressure chamber and a rotating coordinate system that moves simultaneously with the impeller. The flow control equations are calculated separately in the flow field areas of the impeller and pressure chamber. The exchange of flow field information at the interface between different areas is carried out by converting the relative velocity of fluid particles into absolute velocity.