Abstract
The purpose of the present paper is to study the hydrodynamics of the solid phase in a cyclone considered as a high temperature chemical reactor. The measurement of the residence time of the particles is performed using five different methods leading to the same conclusion: that the behaviour of the particles is close to plug flow. General scale-up criteria are proposed, established from very different experimental conditions (cyclone diameters from 2.8 × 10 −2 m to 40 × 10 −2 m; particle sizes from 0.2 × 10 −3 m to 32 × 10 −3 m; wall temperature from 293 to 1123 K; etc.), and allow easy calculation of the residence time of the particles as a function of the Reynolds number of the gas.
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