Author: C. F. Schmid
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 4
Book Description
Simulation of Flocculation in Flowing Fiber Suspensions
Author: C. F. Schmid
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 4
Book Description
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages : 4
Book Description
Simulations of Flocculation in Flowing Fiber Suspensions
Author: Christian Frederick Schmid
Publisher:
ISBN:
Category :
Languages : en
Pages : 252
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 252
Book Description
Fibre Suspension Flocculation Under Simulated Forming Conditions
Author: Huawei Yan
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
Book Description
A flow loop system for study of fibre flocculation insuspensions has been developed. The system is designed tosimulate the flow conditions in a paper machine headbox. It isequipped with a radial distributor feeding a step diffuser pipepackage, after which the flow is contracted in a 2-D nozzle.The flow system is also equipped with a secondary flowcontraction with an area reduction ratio of 2:1 after theheadbox nozzle, mimicking accelerations that may take placeduring forming. The flow system is equipped with heating andcooling devices for the study of temperature effects on fibresuspension flocculation. An online dosage device for the studyof chemical effects on fibre suspension flocculation is alsoincluded. The maximum flow velocity in the system is 16m/s. Flowing fibre suspensions were studied using a high speedCCD video camera and transmitted infra-red laser light pulseillumination. Images were taken either separately before andafter or along the secondary contraction. Images of fibreflocculation were evaluated by power spectrum analysis, and themean floc size and the flocculation index were calculated. Aconcept of mean floc area reduction, based on power spectrum,has been introduced to characterise the fibre network insuspensions. By comparingthe fibre flocculation before andafter the secondary contraction, or by following the fibreflocs along the secondary contraction, floc rheologyinformation can be obtained. The effects of chemical additivesand fibre surface modification can also be studied by comparingthe corresponding fibre flocculation. For a bleached softwood kraft pulp suspension at a fibreconcentration of 5 g/l, the fibre flocs along the secondarycontraction have been manually evaluated, and the resultsconfirm that the power spectrum analysis is applicable. Ca 1/5of the flocs were broken into two by the contraction. (...).
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
Book Description
A flow loop system for study of fibre flocculation insuspensions has been developed. The system is designed tosimulate the flow conditions in a paper machine headbox. It isequipped with a radial distributor feeding a step diffuser pipepackage, after which the flow is contracted in a 2-D nozzle.The flow system is also equipped with a secondary flowcontraction with an area reduction ratio of 2:1 after theheadbox nozzle, mimicking accelerations that may take placeduring forming. The flow system is equipped with heating andcooling devices for the study of temperature effects on fibresuspension flocculation. An online dosage device for the studyof chemical effects on fibre suspension flocculation is alsoincluded. The maximum flow velocity in the system is 16m/s. Flowing fibre suspensions were studied using a high speedCCD video camera and transmitted infra-red laser light pulseillumination. Images were taken either separately before andafter or along the secondary contraction. Images of fibreflocculation were evaluated by power spectrum analysis, and themean floc size and the flocculation index were calculated. Aconcept of mean floc area reduction, based on power spectrum,has been introduced to characterise the fibre network insuspensions. By comparingthe fibre flocculation before andafter the secondary contraction, or by following the fibreflocs along the secondary contraction, floc rheologyinformation can be obtained. The effects of chemical additivesand fibre surface modification can also be studied by comparingthe corresponding fibre flocculation. For a bleached softwood kraft pulp suspension at a fibreconcentration of 5 g/l, the fibre flocs along the secondarycontraction have been manually evaluated, and the resultsconfirm that the power spectrum analysis is applicable. Ca 1/5of the flocs were broken into two by the contraction. (...).
Dynamic Simulation of Flexible Fiber Suspensions
Author: Russell F. Ross
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
Book Description
Simulating Systems of Flexible Fibers
Author: Leonard H. Switzer
Publisher:
ISBN:
Category :
Languages : en
Pages : 298
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 298
Book Description
Rheology
Author: Juan De Vicente
Publisher: BoD – Books on Demand
ISBN: 9535101870
Category : Science
Languages : en
Pages : 354
Book Description
This book contains a wealth of useful information on current rheology research. By covering a broad variety of rheology-related topics, this e-book is addressed to a wide spectrum of academic and applied researchers and scientists but it could also prove useful to industry specialists. The subject areas include, polymer gels, food rheology, drilling fluids and liquid crystals among others.
Publisher: BoD – Books on Demand
ISBN: 9535101870
Category : Science
Languages : en
Pages : 354
Book Description
This book contains a wealth of useful information on current rheology research. By covering a broad variety of rheology-related topics, this e-book is addressed to a wide spectrum of academic and applied researchers and scientists but it could also prove useful to industry specialists. The subject areas include, polymer gels, food rheology, drilling fluids and liquid crystals among others.
On Fibre Suspension Flow Modelling
Author: Marko Hyensjö
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 75
Book Description
Journal of Rheology
Author:
Publisher:
ISBN:
Category : Rheology
Languages : en
Pages : 796
Book Description
Includes abstracts from the Journal of the Society of Rheology, Japan.
Publisher:
ISBN:
Category : Rheology
Languages : en
Pages : 796
Book Description
Includes abstracts from the Journal of the Society of Rheology, Japan.
Fluid-Structure Interactions in Low-Reynolds-Number Flows
Author: Camille Duprat
Publisher: Royal Society of Chemistry
ISBN: 1849738130
Category : Science
Languages : en
Pages : 498
Book Description
An approachable introduction to low Reynolds number flows and elasticity for those new to the area across engineering, physics, chemistry and biology.
Publisher: Royal Society of Chemistry
ISBN: 1849738130
Category : Science
Languages : en
Pages : 498
Book Description
An approachable introduction to low Reynolds number flows and elasticity for those new to the area across engineering, physics, chemistry and biology.
Numerical Modeling of Fibre Suspensions in Grid-generated Turbulent Flow
Author: Atanasis Plikas
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Cellulose fibre floc formation and destruction by hydrodynamic forces in a grid-generated turbulent flow, such as that occurring downstream of turbulence generators in headboxes, is investigated using computational fluid dynamics (CFD) modeling. A Large Eddy Simulation was performed to elucidate the physics behind the break up of fibre flocs. Upon comparison with experimental data on fibre suspension flows, it was found that the minimum fibre flocculation coincided with the maximum time dependence and strain in the mean motion. The turbulent kinetic energy at these locations was negligible. A numerical model of the fibre flow was developed using an Eulerian multiphase flow model in where a transport equation for flocculation intensity was solved together with the momentum equations and turbulence models. Agreement with experimental data is good far downstream of the grids, but inadequate in the anisotropic flow immediately downstream of the grids.
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Cellulose fibre floc formation and destruction by hydrodynamic forces in a grid-generated turbulent flow, such as that occurring downstream of turbulence generators in headboxes, is investigated using computational fluid dynamics (CFD) modeling. A Large Eddy Simulation was performed to elucidate the physics behind the break up of fibre flocs. Upon comparison with experimental data on fibre suspension flows, it was found that the minimum fibre flocculation coincided with the maximum time dependence and strain in the mean motion. The turbulent kinetic energy at these locations was negligible. A numerical model of the fibre flow was developed using an Eulerian multiphase flow model in where a transport equation for flocculation intensity was solved together with the momentum equations and turbulence models. Agreement with experimental data is good far downstream of the grids, but inadequate in the anisotropic flow immediately downstream of the grids.