Technical Papers and Presentations

An industrial pulp screen is investigated. The dilute pulp is pumped through a screen barrier. In order to avoid the fiber network to plug, it is necessary to 1) fluidize the shear thinning pulp 2) expose the barrier with plug releasing pressure pulses.

This work involves a 2-step study. Step 1: The full screen flow is simulated using Mixer Module Frozen Rotor k-. Essential pressure field is extracted from the results. Step 2: Detailed transient k- simulation of the flow in the direct vicinity of the screen barrier. Important results includes rotor element pressure and details of the flushing backflow which cleans the barrier. COMSOL Multiphysics® software proves to be a qualified CFD tool for the demanding pulp and paper industry.