The 3D Numerical Simulation Study On Solid-Liquid Hydrocyclone

Hydrocyclone is a kind of equipment which can use the liquid pressure to creat revolving movement and can be ued for separating two-phase or multi-phase material that has different density. As early as 1891 the hydrocyclone has been created, but the most research on it is used for classification, the use on solid-liquid separating is much less. Because of its advantages such as compact structure, low price, high production capacity and high efficiency and so on, its application on solid-liquid separating is being paid more and more attention.This thesis did the numerical simulation research on solid-liquid hydrocyclone for eliminating sand, using FLUENT 6.1.22, the business software of CFD. On the base of deeply understanding of hydrocyclone, the author studied the water flow field, tracks of particles, separated efficiency, pressure drop and so on in many different conditions. After a mass of systemic numerical simulation with different structures and technical conditions were made, some conclusions were drawn out as follows:1. solid-liquid hydrocylone used in practical production has three phases —gas, liquid and solid coexistence in its inner flow fields. Air core comes into being because of central minus pressure and goes through the hydrocyclone from the overflow gate to the bottom outlet after the flow field become steady. Author chooses the "mixture" moder to simulate the air core and the effect of simulation is good. For water, the tangential velocity is the biggest and the axial velocity is bigger than radial velocity; for air core, the tangential velocity is much bigger than axial velocity and radial velocity. The whole flow in the hydrocyclone is double vortex. With the boundary of LZVV, outside of which is the revolving flow downwards, inside of which is the revolving flow upwards, and their revolved direction is the same.2. The distribution rule of turbulent kinetic energy is much the same as the...