Near wall effects in the plug flow of pulp suspensions
Journal article, 2011
Experimental data by the authors are further analysed to gain a more detailed understanding of the mechanisms of the plug flow and near-wall behaviour in the pipe flow of pulp suspensions at concentrations up to 4.7% by weight. The results indicate two-phase flow effects near the wall, one being that the apparent viscosity is higher than that of water. Another is that the wall shear stress estimated with the pressure drop data and a force balance is much higher than the one obtained with the measured velocity profile, indicating the presence of mechanical friction forces.
pipe-flow
flow models
uvp
yield-stress
pulp suspensions
cfd
dynamics
flow mechanisms
fiber suspensions
plug flow
Author
Helena Fock
Chalmers, Chemical and Biological Engineering, Chemical Engineering Design
Julia Claesson
Chalmers, Chemical and Biological Engineering, Chemical Engineering Design
Anders Rasmuson
Wallenberg Wood Science Center (WWSC)
Chalmers, Chemical and Biological Engineering, Chemical Engineering Design
T. Wikstrom
Metso
Canadian Journal of Chemical Engineering
0008-4034 (ISSN) 1939019x (eISSN)
Vol. 89 5 1207-1216Subject Categories (SSIF 2011)
Chemical Sciences
DOI
10.1002/cjce.20471