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A theoretical analy...
A theoretical analysis of the flow stability in roll forming of paper
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- Holm, Richard (författare)
- KTH,FaxénLaboratoriet,Mekanik
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- Söderberg, L. Daniel (författare)
- KTH,Mekanik
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(creator_code:org_t)
- 2005
- 2005
- Engelska.
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Ingår i: Nordic Pulp & Paper Research Journal. - 0283-2631 .- 2000-0669. ; 20:2, s. 212-216
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Nyckelord
- papermaking
- forming
- roll dewatering
- mathematical modelling
- gap formers
- Engineering mechanics
- Teknisk mekanik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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