### Abstract

As opposed to "normal" hydrocyclones, large-cone-angle hydrocyclones can be used to separate solids with equal free-fall velocities but with different densities. One of the applications of these cyclones is the recovery of heavy minerals from sand.
In order to investigate the hydrodynamical behaviour of such a cyclone the following experiments have been carried out on two cyclones of diferent dimensions: determination of solids distribution at steady state operation; measurement of the residence time distribution of the liquid; pressure gradient and pressure drop measurements.
From the experimental results it follows that at the bottom a bed of suspended solids rotates, which more or less seems to be fluidized. Similar to the derivation of an expression of the pressure gradient in a one-phase vortex flow from the Navier-Stokes equation, an expression of the pressure gradient in such a solid-liquid vortex flow has been obtained from two-phase momentum equations. From this theory it follows that in the rotating bed a secondary solids flow has to occur; solids are moving towards the centre at the bottom and away from the centre at the top.

Original language | English |
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Pages (from-to) | 1651-1661 |

Number of pages | 11 |

Journal | Chemical Engineering Science |

Volume | 38 |

Issue number | 10 |

DOIs | |

Publication status | Published - 1983 |

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## Cite this

Duijn, van, G., & Rietema, K. (1983). Performance of a large-cone-angle hydrocyclone. I. Hydrodynamics.

*Chemical Engineering Science*,*38*(10), 1651-1661. https://doi.org/10.1016/0009-2509(83)85022-2