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The effect of slot shape on the performance of a pressure screen.

APPLICATION: The computer program can be used to predict the characteristics of pressure screens having different slot shapes, so as to optimize the screen slot design.

A new simulation tool was used to examine the flow and fiber behavior near a pressure screen slot. This simulation program was developed on the basis of three models. A fluid model was used to predict the flow field, a fiber model was used to predict the fiber motion, and a wall model was used for the situation in which a fiber touches a solid wall.

This simulation tool gives us a way to examine the passage of a fiber of any length and flexibility through a screen slot with any reasonable shape. It can also be used to study the behavior of fibers in other complex turbulent flows and in other types of equipment, such as headboxes.

The authors studied the passage ratio of fibers moving through slots of several types of geometries. The slot shape was found to have the most important critical influence on the fiber passage ratio Among all the slot shapes tested, a slot with sloping sides upstream and downstream offers the best passage for fibers under the conditions studied. View this paper online at http://www.tappi.org/index.asp?pid=29253

Suqin Dong is now working at Process Simulations Ltd., Vancouver, 206-2386 East Mall, BC V6T 1Z3, Canada. Martha Salcudean and lan Gartshore are at the Dept. of Mechanical Engineering, University of British Columbia, 2054-2324 Main Mall, Vancouver, BC, V6T 1Z4, Canada Email Salcudean at msal@mech.ubc.ca.
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Title Annotation:Screening
Author:Gartshore, Ian
Publication:Solutions - for People, Processes and Paper
Date:May 1, 2004
Words:262
Previous Article:Summaries of May 2004 peer-reviewed papers.
Next Article:Using near-infrared multivariate image regression to predict pulp properties.


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