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Development of material models for dewatering of pulp suspension
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2008 (English)In: Proceedings of the 19th International Symposium on Transport Phenomena (ISTP-19): Reykjavik, Iceland, August 17-21, 2008 / [ed] Sigurdur Brynjolfsson; Olafur Petur Palsson; Jong H. Kim, University of Iceland, Faculty of Industrial Engineering, Mechanical Engineering and Computer Science , 2008Conference paper (Refereed)
Abstract [en]

During the process of making pulp from wood, free fibers are mixed in a pulp suspension containing a large amount of water (98-50% by mass), wood fibers and often some processing chemicals. The suspension in this process is gradually cleaned from dissolved material. The suspension can be washed in a displacement washing step where the dirty fluid is replaced with a cleaner one. or by a compression step which increases the consistency of the suspension. To reduce costs and to increase the production rate of pulp and paper overall it is important to understand the interaction between fluid and fibers in such processes. During dewatering and washing, fibers are exposed to a drag force from the fluid. As the concentration of fibers increases this drag force and, consequently, the pressure generated from it become proportional to the permeability of the fiber network formed. When contact between fibers increases, an additional pressure emanates caused by bending and compressing of the fibers. By comparing experiments to a numerical model this study shows that for high dewatering velocities the resulting force required to dewater a suspension cannot be found by adding these two pressures. One reason for this may be that intra-fiber flows contribute to the force. Another explanation can be related to reinforcement

Place, publisher, year, edition, pages
University of Iceland, Faculty of Industrial Engineering, Mechanical Engineering and Computer Science , 2008.
Research subject
Fluid Mechanics
URN: urn:nbn:se:ltu:diva-30118Local ID: 3d7996f0-7513-11dd-a03a-000ea68e967bOAI: diva2:1003345
International Symposium on Transport Phenomena : 17/08/2008 - 21/08/2008
Godkänd; 2008; Bibliografisk uppgift: CD-ROM; 20080828 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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