Dewatering saturated, networked suspensions with a screw press

Tom S. Eaves (Lead / Corresponding author), Daniel T. Paterson, Duncan R. Hewitt, Neil J. Balmforth, D. Mark Martinez

Research output: Contribution to journalArticle

Abstract

A model is presented for the dewatering of a saturated two-phase medium in a screw press. The model accounts for the detailed 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 help reduce the dynamics to an annular bi-axial compression of the two-phase medium. Unlike previous modelling, the transition point between the two zones is determined self-consistently, rather than set a priori, and the pressure along the length of the press is deduced from the rheology of the two-phase flow rather than averaging the two-phase dynamics over a cross section of the press. The model is compared to experimental observations of the dewatering of a paper-making fibre suspension and of a clay slurry, and is shown to reproduce operational data.
Original languageEnglish
Number of pages28
JournalJournal of Engineering Mathematics
Volume120
Issue number1
Early online date12 Dec 2019
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • Clay
  • Consolidation
  • Dewatering
  • Pulp
  • Screw press
  • Two-phase flow

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