Two-phase flow in a screw press

Activity: Talk or presentation typesInvited talk


I present a mathematical model of the dewatering of a saturated two-phase medium in a screw press. The model accounts for the two-phase rheological behaviour of the pressed material and splits the press into two zones, an initial well-mixed constant-pressure region followed by an axial transport region in which the total pressure steadily increases. In this latter region, a slowly-varying helical coordinate transformation is introduced to reduce the dynamics to an annular bi-axial compression of the two-phase medium. The model is compared to experimental observations of the dewatering of a paper-making fibre suspension, and is shown to reproduce operational data.
Period17 Jun 2021
Held atUniversity of Bristol, United Kingdom


  • Pulp and Paper
  • Porous Media
  • Mathematical Modelling
  • Screw Press