Aspects Regarding Gradular Systems Phenomrenon Flow from Tanks and Silo

  • M. MUNTEAN University of Agricultural Science and Veterinary Medicine
  • I. DROCAS University of Agricultural Science and Veterinary Medicine
  • S. STANILA University of Agricultural Science and Veterinary Medicine
  • A. MOLNAR University of Agricultural Science and Veterinary Medicine
  • O. RANTA University of Agricultural Science and Veterinary Medicine
  • O. MARIAN University of Agricultural Science and Veterinary Medicine
Keywords: processing raw materials, flow phenomenon, friction coefficient, tank and silo

Abstract

In frequent technological processes of food industry the use of classification, gradation, calibration or sifting operation becomes a necessity. All operations need flow phenomenon for granular systems follow by mechanical operation realized through separation in granulometric factions of some polidisperse mixtures of granules and powder, on the basis of particle shape and size. Acquiring a specific type of flow (normal or hydraulic) depends on the ratio of the internal friction angle, the friction angle between particles and the wall of the tank and the inclination angle of the wall of the tank from the evacuation hole. The lower the value of the friction internal coefficient is (the material flows more easily), the more limited the area characteristic to hydraulic flow is.