Search: onr:"swepub:oai:DiVA.org:kth-14889" >
A theoretical analy...
A theoretical analysis of the flow stability in roll forming of paper
-
- Holm, Richard (author)
- KTH,FaxénLaboratoriet,Mekanik
-
- Söderberg, L. Daniel (author)
- KTH,Mekanik
-
(creator_code:org_t)
- 2005
- 2005
- English.
-
In: Nordic Pulp & Paper Research Journal. - 0283-2631 .- 2000-0669. ; 20:2, s. 212-216
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.3...
-
show less...
Abstract
Subject headings
Close
- This paper deals with the fundamental mechanisms that control partial roll dewatering in papermaking. The flow around the forming cylinder is modelled in a cylindrical coordinate system and the wire is assumed to be impermeable. The governing equations are reduced based on a discussion where the magnitude of the different terms is estimated. Given this reduced set of equations a non-linear equation for the position of the wire is deduced. This clearly shows that one of the most important parameters is the Weber number, We, which is the non-dimensional number that can be obtained by comparing the effect of wire tension in relation to the momentum of the incoming headbox jet. The characteristics of the non-linear equation are discussed and the equation is linearized around the trivial solution to the equations, which gives that the wire is displaced a constant distance from the roll along the whole wrap. The linear equation has a standing wave solution with a specific wavelength that scales with We. This solution is compared to previously measured profiles regarding the wavelength of the waves.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Keyword
- papermaking
- forming
- roll dewatering
- mathematical modelling
- gap formers
- Engineering mechanics
- Teknisk mekanik
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database