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Near wall effects in the plug flow of pulp suspensions
Author(s) -
Fock Helena,
Claesson Julia,
Rasmuson Anders,
Wikström Tomas
Publication year - 2011
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20471
Subject(s) - spark plug , plug flow , pressure drop , mechanics , shear stress , materials science , flow (mathematics) , pipe flow , geotechnical engineering , geology , engineering , physics , mechanical engineering , turbulence
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.