Abstract: The radial velocity of flow field in hydrocyclones has great influence on the particle radial movement, which decides the degree of resisting particle radial movement and the diameter of the minimum particles the hydrcyclone can separates. Based on the numerical simulation of radial velocity of the flow fluid in hydrdocyclone，the radial velocity of flow in hydrocyclone is studied in the paper. The studies shows that the value of the radial velocity increases first and then decreases gradually along the radius direction inwards, and finally, falls to zero at the liquid/air interface, the two kinds of conclusions are correlated and studied, it is recognized that the Kε turbulence model and the Boussinesq hypothesis are not suitable for the flow field in hydrocyclone. 
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Key words: hydrocyclone, flow field, radial velocity, distribution Law, numerical simulation