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Analysis of a model for twin-wire forming
KTH, Skolan för teknikvetenskap (SCI), Centra, FaxénLaboratoriet. KTH, Tidigare Institutioner                               , Mekanik.
KTH, Skolan för teknikvetenskap (SCI), Centra, FaxénLaboratoriet. KTH, Tidigare Institutioner                               , Mekanik.
KTH, Skolan för teknikvetenskap (SCI), Centra, FaxénLaboratoriet. KTH, Tidigare Institutioner                               , Mekanik.ORCID-id: 0000-0002-8318-1251
2004 (engelsk)Inngår i: PROGRESS IN INDUSTRIAL MATHEMATICS AT ECMI 2002    / [ed] Buikis A; Ciegis R; Fitt AD, 2004, Vol. 5, s. 369-373Konferansepaper, Publicerat paper (Fagfellevurdert)
sted, utgiver, år, opplag, sider
2004. Vol. 5, s. 369-373
Serie
MATHEMATICS IN INDUSTRY ; 5
Emneord [en]
2-DIMENSIONAL SIMULATION, SUCTION SHOES, GAP FORMERS
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-25438ISI: 000189413900050ISBN: 3-540-40113-X (tryckt)OAI: oai:DiVA.org:kth-25438DiVA, id: diva2:358415
Konferanse
12th Conference of the European-Consortium-for-Mathematics-in-Industry, Jurmala, LATVIA, SEP 10-14, 2002
Merknad
QC 20101021Tilgjengelig fra: 2010-10-21 Laget: 2010-10-21 Sist oppdatert: 2010-10-21bibliografisk kontrollert
Inngår i avhandling
1. Mechanical modelling of blade forming and drainage of flocculated suspensions
Åpne denne publikasjonen i ny fane eller vindu >>Mechanical modelling of blade forming and drainage of flocculated suspensions
2005 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

A method has been developed for flexible modelling of multi-component twin-wire blade formers. Features such as suction devices, loadable blades, curved blades, and partial contact between the blades and the forming fabrics are easily incorporated. New results include a series of calculations demonstrating the non-trivial interaction between the pressure pulses when the blades are positioned successively closer together, the effects of suction on the pressure pulse generated by a blade applied to the opposing wire, and how blades of modest curvature do not necessarily stay in contact with the fabric along their full width and the implications of this on the pressure gradients in the machine direction.

The behaviour of the fibre mats as they experience the first of the blade pulses (after having been formed over a roll) is then considered in detail. Typically, the thickness of the mats decreases during the pulse, which reduces the rate of deposition of new fibres onto the webs. The amount of fibres in the sheets therefore changes marginally. Nevertheless, the resistance to drainage presented by the fibre network is seen to increase significantly due to the low permeability in highly compressed layers of the mat. As a result of the pressure gradients in the machine direction, the shear stresses in the plane of the fibre sheets can attain several hundred Pascal next to the forming fabrics.

Further, a model for sheared consolidation of flocculated suspensions is presented that extends the concept of a concentration dependent yield stress, previously employed in studies of uniaxial consolidation, to comprise flocculated phase shear strength. Rate-dependent viscous stresses are also incorporated. The theory is applied to the problem of combined compression and shearing of a strongly flocculated suspension contained between two plates, one being fixed and acting as a perfectly permeable filter, the other movable and acting as a piston by which the load is applied. Qualitatively, the evolution of the volume fraction of solids exhibits the same behaviour as during uniaxial consolidation without shear. Applying shear is however predicted to increase the rate of the drainage process, due to a reduced load bearing capacity of the flocculated phase, and correspondingly higher pore pressures.

sted, utgiver, år, opplag, sider
Stockholm: KTH, 2005. s. viii, 50
Serie
Trita-MEK, ISSN 0348-467X ; 2005:3
Emneord
Applied mechanics, blade forming, pressure distribution, interaction, suction, drainage, Teknisk mekanik
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-141 (URN)
Disputas
2005-03-11, Kollegiesalen, Valhallavägen 79, Stockholm, 14:00
Opponent
Veileder
Merknad
QC 20101022Tilgjengelig fra: 2005-03-03 Laget: 2005-03-03 Sist oppdatert: 2010-10-22bibliografisk kontrollert

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