Näytä suppeat kuvailutiedot

dc.contributor.authorKeränen, Janne
dc.date.accessioned2012-01-12T12:11:41Z
dc.date.available2012-01-12T12:11:41Z
dc.date.issued2011
dc.identifier.isbn978-951-39-4590-9
dc.identifier.otheroai:jykdok.linneanet.fi:1191989
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/37198
dc.description.abstractThis PhD Thesis concentrates on paper drying: first on the drying rate in a cylinder covered with fabric, enhanced using hot air impingement through the fabric, and its potential effects on paper quality, and second, on the heat transfer rate from hot steam to paper through the cylinder shell. Cylinder drying is a drying method where a heated surface in contact with paper causes water removal from the latter by evaporation. Impingement through the fabric of hot air has been suggested to cause increase in the water removal and drying of paper. Increase in the drying rate by impingement of hot air was confirmed by laboratory tests and by simulations. In laboratory tests the increase in the drying rate was found to be accompanied by improvements in paper quality. The reason for the unexpectedly high increase in the case of combined cylinderimpingement drying of the drying rate was traced down to decrease in the temperature of paper. The thereby increased temperature gradient between paper and cylinder surface caused an increase in the heat flux from the cylinder. A simulation model for the system showed similar increase in the drying rate of paper. Simulations could also be extended to a paper machine scale. Use of the simulation model required further work on the experimental transport of moisture in the thickness direction of paper, with successful results. The potential of impingement drying for improving paper quality was demonstrated, especially for prevention of shrinkage of paper during drying. Shrinkage prevention has a positive influence on the tensile properties of paper. Shrinkage prevention still needs verification in a larger scale, however.fi
dc.format.extentverkkoaineisto (80 sivua).
dc.language.isoeng
dc.publisherUniversity of Jyväskylä
dc.relation.ispartofseriesResearch report / Department of Physics, University of Jyväskylä
dc.relation.isversionofISBN 978-951-39-4589-3
dc.subject.otherpaper drying
dc.subject.othermoisture gradient
dc.subject.othersimulation
dc.subject.othercylinder drying
dc.subject.otherimpingement drying
dc.subject.otherheat transfer
dc.subject.othercylinder shell
dc.titleIncreasing the drying efficiency of cylinder drying
dc.typeDiss.fi
dc.identifier.urnURN:ISBN:978-951-39-4590-9
dc.type.dcmitypeTexten
dc.type.ontasotVäitöskirjafi
dc.type.ontasotDoctoral dissertationen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Mathematics and Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineFysiikkafi
dc.relation.issn0075-465X
dc.relation.numberinseriesno. 14/2011
dc.rights.accesslevelopenAccessfi
dc.subject.ysokuivaus
dc.subject.ysopaperinvalmistus
dc.subject.ysovesipitoisuus
dc.subject.ysomallintaminen
dc.subject.ysosimulointi
dc.subject.ysolämmön siirtyminen
dc.subject.ysosylinterit


Aineistoon kuuluvat tiedostot

Thumbnail

Aineisto kuuluu seuraaviin kokoelmiin

Näytä suppeat kuvailutiedot