MECHANISM OF HYDRAULIC CONVEYING AT HIGH CONCENTRATION IN VERTICAL AND HORIZONTAL PIPES

This paper examines the flow behaviour of high concentration suspensions of glass ballotini water in vertical and in horizontal pipework. The mechanism of flow is illustrated experimentally by injecting liquid and solid tracers into a flowing suspension and thereby obtaining the velocity profiles of both phases independently. In horizontal flow there is a tendency for the particles to settle at low velocities and this produces intergranular shear and a well defined velocity profile within the solid phase. In vertical flow, the particles are supported by the fluid but the in-line solids concentration remains almost constant, with increasing mean velocity of flow. At high velocity, pressure drop is attributed to liquid wall friction, since solid-solid interactions have negligible effect. The liquid wall friction is greatly affected by the presence of the particles and cannot be predicted accurately by using classical correlations for water alone at the same mean velocity. /Author/TRRL/

  • Corporate Authors:

    British Hydromechanics Research Association

    Cranfield MK43 0AJ, Bedfordshire,   England 
  • Authors:
    • Bantin, R A
    • Streat, M
  • Publication Date: 1973

Media Info

  • Features: Figures; References; Tables;

Subject/Index Terms

Filing Info

  • Accession Number: 00132627
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Proceeding
  • Files: ITRD, TRIS
  • Created Date: Nov 9 1977 12:00AM