a hydrocyclonic apparatus has been designed to separate a less dense dispersed phase from a more dense liquid phase . the cyclone separator consists of two generally cylindrical portions positioned around the longitudinal axis in a ` piggyback ` manner . a vortex finder with an orifice plate captures the dispersed particles entrained in a local secondary flow established by the unique operating and design parameters of the device . clear fluid is removed from the apparatus through an underflow tube opposite the vortex finder tube . the liquid feed containing dispersed particles is introduced into the primary cyclone around the vortex finder as a swirling annular jet . another stream , containing no dispersed phase , is introduced as a tangential flow surrounding the annular jet . a polymer stream is injected into the core of the vortex flow of the primary cyclone to increase the stability of the vortex core and to moderate the turbulence .