Change search
ReferencesLink to record
Permanent link

Direct link
Flow conditions in the grooves of a Low-Consistency refiner
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. (Fuchs)ORCID iD: 0000-0001-9976-8316
KTH, School of Engineering Sciences (SCI), Mechanics.
Show others and affiliations
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 27, no 2, 173-183 p.Article in journal (Refereed) Published
Abstract [en]

The flow pattern in the grooves plays a major role for the homogeneity of refining as well as for the transfer and loading of fiber flocs in refining position on the bar edges. However, it is an area where very little information is available. In the present study, flow conditions in the grooves in a Low-Consistency (LC) - disc refiner were studied both experimentally and numerically. The experimental study involved high-speed imaging through a 3 cm peephole into a commercial refiner. The Computational Fluid Dynamics (CFD) simulation focused on the flow condition in a radial groove, considering both Newtonian and non-Newtonian flows. Flow conditions for stator and rotor grooves were modeled along the groove at different angular speeds and pressure differences over the refiner. Both the experimental and the modeling results show a dual flow pattern in the grooves; a rotational/spiral movement at the top of the groove and a flow in the direction of the groove at the bottom, which to the authors knowledge has not been reported in literature. The strong vortical motion at the top of the grooves observed both for the rotor and the stator are believed to be important for placing the fibers onto the bar edges and to induce shear forces in such a way that the fibers get treated. Moreover, a large sensitivity to suspension properties in terms of the development of flow pattern was detected.

Place, publisher, year, edition, pages
2012. Vol. 27, no 2, 173-183 p.
Keyword [en]
Disc refiner, Chemical pulps, Fiber suspension, Flow, Softwood pulps, Hardwood pulps, High-speed imaging, Computational Fluid Dynamics
National Category
Paper, Pulp and Fiber Technology
URN: urn:nbn:se:kth:diva-104878DOI: 10.3183/NPPRJ-2012-27-02-p173-183ISI: 000315696000002ScopusID: 2-s2.0-84865241072OAI: diva2:567822
Swedish Research CouncilThe Swedish Energy AgencySwedish e‐Science Research Center

QC 20121114

Available from: 2012-11-14 Created: 2012-11-14 Last updated: 2013-04-08Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Prahl Wittberg, LisaKhokhar, GoharDahlkild, Anders
By organisation
MechanicsLinné Flow Center, FLOW
In the same journal
Nordic Pulp & Paper Research Journal
Paper, Pulp and Fiber Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 75 hits
ReferencesLink to record
Permanent link

Direct link