Orientation of slowly sedimenting fibers in a flowing suspensionnear a plane wall
2007 (English)In: Svenska Mekanikdagarna, 2007Conference paper (Refereed)
The effect of a wall on the orientation of slowly sedimenting fibers suspended in a shear flow has been studied experimentally. Experiments were performed at two concentrations with two aspect ratios, rp ≈ 7 and rp ≈ 30, where rp is defined as the fiber length divided by the diameter. For all cases the majority of the fibers were oriented close to parallel to the flow direction for distances farther away from the wall than half a fiber length. As the distance from the wall decreased a change in orientation was observed. At distances from the wall closer than about an eighth of a fiber length a significant amount of the fibers were oriented close to perpendicular to the flow. This was particularly clear for the shorter fibers. Due to the density difference between the fibers and the surrounding fluid the fiber concentration was increased in the near wall region. An increased concentration was found in a limited region close to half a fiber length from the wall. For the shorter fibers a large number of fibers was also detected in the very proximity of the wall.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-9999OAI: oai:DiVA.org:kth-9999DiVA: diva2:200900
60th Annual Division of Fluid Dynamics Meeting
of the American Physical Society, Salt Lake City, UT, USA 2008.
QC 201007062009-03-022009-03-022010-07-21Bibliographically approved