FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W16620296> ?p ?o ?g. }

• W16620296 abstract "The production of paper pulp involves the handling of large quantities of fibre suspensions. Today's call for energy efficiency and environmentally sound processes has led to the development of MC (Medium Consistency) technology. Most unit operations in the pulp industry are now routinely performed at concentrations higher than 10 %, at which fibre suspensions behave as solids at low shear rates. If the shear rate is sufficiently high, however, the behaviour of MC suspensions resembles that of pure water. This thesis deals with the network strength (or yield stress) of fibre suspensions, which is a suspension property that may be related to the flow transitions of fibre suspensions. The main cause of network strength is the frictional force in the contact points between single fibres. A novel measurement method was developed to measure the inter-fibre friction of single pulp fibres. The coefficient of friction was found to be around 0.6 for dry kraft fibres and range between 0.6-0.8 for wet kraft fibres. A mechanistic model has been developed for predicting the network strength of homogeneous suspensions. It gives fair agreement with experimental yield stress data for homogeneous suspensions; the experimental values for flocculated suspensions were lower. The turbulent flow of pulp fibre suspensions at Medium Consistency has been subject to much speculation due to the absence of direct measurements. A rotary shear-tester, resembling an industrial mixer, was designed and constructed to permit direct velocity measurements using Laser Doppler Anemometry (LDA). The fibre concentrations were up to 20 wt % using a refractive index matched glass fibre suspension. Both mean and fluctuating velocities were found to be close to those of single-phase flow at flows above a critical rotational speed. At lower rotational speeds, the turbulence was strongly suppressed, whereas the mean velocities were close to those of fully developed turbulent flow. The single-phase flow was compared to single-phase CFD (Computational Fluid Dynamics) calculations using the sliding-grid technique. The flow field was predicted well by using the standard k-epsilon turbulence model, but the absolute values were 25 % too low. Boundary-layer measurements, including the viscous sub-layer, were performed as well. Linear velocity profiles were obtained close to the wall for both the single-phase and the tested suspensions. Further from the wall, flatter velocity profiles were obtained in the fibre suspensions than for single-phase flow." @default.
• W16620296 created "2016-06-24" @default.
• W16620296 creator A5034527143 @default.
• W16620296 date "1998-01-01" @default.
• W16620296 modified "2023-09-24" @default.
• W16620296 title "Network Disruption and Turbulence in Fibre Suspensions" @default.
• W16620296 hasPublicationYear "1998" @default.
• W16620296 type Work @default.
• W16620296 sameAs 16620296 @default.
• W16620296 citedByCount "0" @default.
• W16620296 crossrefType "dissertation" @default.
• W16620296 hasAuthorship W16620296A5034527143 @default.
• W16620296 hasConcept C105341887 @default.
• W16620296 hasConcept C106486073 @default.
• W16620296 hasConcept C114614502 @default.
• W16620296 hasConcept C121332964 @default.
• W16620296 hasConcept C142724271 @default.
• W16620296 hasConcept C159985019 @default.
• W16620296 hasConcept C165682214 @default.
• W16620296 hasConcept C188442228 @default.
• W16620296 hasConcept C192562407 @default.
• W16620296 hasConcept C196445361 @default.
• W16620296 hasConcept C196558001 @default.
• W16620296 hasConcept C200990466 @default.
• W16620296 hasConcept C202444582 @default.
• W16620296 hasConcept C33923547 @default.
• W16620296 hasConcept C57879066 @default.
• W16620296 hasConcept C5961521 @default.
• W16620296 hasConcept C66882249 @default.
• W16620296 hasConcept C71924100 @default.
• W16620296 hasConcept C99148416 @default.
• W16620296 hasConceptScore W16620296C105341887 @default.
• W16620296 hasConceptScore W16620296C106486073 @default.
• W16620296 hasConceptScore W16620296C114614502 @default.
• W16620296 hasConceptScore W16620296C121332964 @default.
• W16620296 hasConceptScore W16620296C142724271 @default.
• W16620296 hasConceptScore W16620296C159985019 @default.
• W16620296 hasConceptScore W16620296C165682214 @default.
• W16620296 hasConceptScore W16620296C188442228 @default.
• W16620296 hasConceptScore W16620296C192562407 @default.
• W16620296 hasConceptScore W16620296C196445361 @default.
• W16620296 hasConceptScore W16620296C196558001 @default.
• W16620296 hasConceptScore W16620296C200990466 @default.
• W16620296 hasConceptScore W16620296C202444582 @default.
• W16620296 hasConceptScore W16620296C33923547 @default.
• W16620296 hasConceptScore W16620296C57879066 @default.
• W16620296 hasConceptScore W16620296C5961521 @default.
• W16620296 hasConceptScore W16620296C66882249 @default.
• W16620296 hasConceptScore W16620296C71924100 @default.
• W16620296 hasConceptScore W16620296C99148416 @default.
• W16620296 hasLocation W166202961 @default.
• W16620296 hasOpenAccess W16620296 @default.
• W16620296 hasPrimaryLocation W166202961 @default.
• W16620296 hasRelatedWork W1024709411 @default.
• W16620296 hasRelatedWork W144052356 @default.
• W16620296 hasRelatedWork W146517824 @default.
• W16620296 hasRelatedWork W15061082 @default.
• W16620296 hasRelatedWork W1967509406 @default.
• W16620296 hasRelatedWork W2018081277 @default.
• W16620296 hasRelatedWork W2032315696 @default.
• W16620296 hasRelatedWork W2121772853 @default.
• W16620296 hasRelatedWork W2186679481 @default.
• W16620296 hasRelatedWork W228175313 @default.
• W16620296 hasRelatedWork W250829813 @default.
• W16620296 hasRelatedWork W2548117221 @default.
• W16620296 hasRelatedWork W2596346741 @default.
• W16620296 hasRelatedWork W2740834716 @default.
• W16620296 hasRelatedWork W288993316 @default.
• W16620296 hasRelatedWork W2998163160 @default.
• W16620296 hasRelatedWork W575696463 @default.
• W16620296 hasRelatedWork W620370497 @default.
• W16620296 hasRelatedWork W633072698 @default.
• W16620296 hasRelatedWork W879590471 @default.
• W16620296 isParatext "false" @default.
• W16620296 isRetracted "false" @default.
• W16620296 magId "16620296" @default.
• W16620296 workType "dissertation" @default.