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Near Wall Studies of Pulp Suspension Flow Using LDA
Author(s) -
Pettersson A. Johan,
Wikström Tomas,
Rasmuson Anders
Publication year - 2006
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.5450840403
Subject(s) - plug flow , volumetric flow rate , dilution , laser doppler velocimetry , pulp (tooth) , spark plug , materials science , annulus (botany) , flow (mathematics) , mechanics , composite material , analytical chemistry (journal) , chromatography , chemistry , thermodynamics , physics , blood flow , medicine , pathology
A detailed study of the flow behaviour in the near wall region of pulp suspensions up to 4.7% have been performed using Laser Doppler Anemometry (LDA) in pipe flow. Axial mean velocity profiles show a distinct plug flow and an increase of the plug region as the flow rate decreases and fibre concentration increases. An attempt is made to relate the LDA data‐rate to fibre concentration, which indicates a dilution region at 1‐2 mm from the wall that is larger than the annulus region. The dilution region increases with increasing flow rate, decreasing concentration and when using longer pulp fibres.