A cyclone dust collector (called herein a cyclone) is applied in many industrial fields, for example, powder technology, combustion chambers, various chemical plants, etc. Until now, there are many types of cyclones for the purpose of separation of solid particles; however generally-speaking, the following types of the cyclone are typical: returned flow or reversed flow type, axial flow type, and rotary flow cyclone with tangential injection of the second gas flow to the cyclone body. In order to understand the performance of the cyclone and the problems of turbulent rotational flow and the separation mechanism for solid particles, this review article describes the flow pattern and distribution of the tangential velocity for pure gas flow and for dust laden gas flow, which are most important factors for estimating the pressure drop and the separation characteristics of the solid particles, and also the mechanical separation process in the centrifugal flow field. This review article includes 162 references.

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