LDV DIAGNOSIS OF FLOW FIELD IN LIQUID LIQUID HYDROCYCLONE WITH DOUBLE CYLINDER AND SINGLE CONE
双柱单锥型液-液旋流管内流场的激光诊断

The whole velocity and turbulence fields in a liquid liquid hydrocyclone with double cylinder and single cone were diagnosed with atwo dimensional LDV system under five testing conditions. The resultsshow that fluid flow in the hydrocyclone is a very strongly swirling turbulent flow. The fluid flows in tangentialdirection are composed of inner and outer swirling flows. The tangential velocity in the inner region is in accordance with therelation of Rankine's forced vortex . The flow field in theouter region is more complex than that in the inner area. In cylindersection of the hydrocyclone, the flow follow the relation of Rankine'sfree vortex, but it obeys a different relation in the cone section; Theaxial velocity field can be divided into downward and upward flows, which are distinguished by a zero velocitypoint in the cylinder and by a zero velocity region in the cone. The range of the zero velocity region decreases with contraction of the crosssection in the cone and disappears in the cylinder.; The values of turbulent parameters in the swirling core are much greater than that inthe outer region, and the values in cylinder Section are greater than that in cone section. Therefore the turbulence characteristic in thehydrocyclone is anisotropie.