par Jottrand, René 
Référence Chemical engineering science, 3, 1, page (12-16)
Publication Publié, 1954-02
Référence Chemical engineering science, 3, 1, page (12-16)
Publication Publié, 1954-02
Article révisé par les pairs
| Résumé : | Experiments and a study of the literature confirm the general equation u = Vε{lunate}σ where u is liquid velocity above the bed, V the free falling velocity of the particles in water and ε{lunate} the fraction of the volume of the bed occupied by liquid, σ depends on the shape of the particles and the turbulence of the fluid. It varies with the free space of the bed at rest ε{lunate}i. The law is used to calculate the distance between particles as a fraction of their diameter and the fluid velocity. It is then possible to explain why there is no classification in a concentrated bed. Experiments with different coloured particles show that classification is due to varying density and not due to variation in the free falling velocity. © 1954. |
