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The Two‐Phase Flow in an Axially Stirred Vessel Investigated Using Phase‐Doppler Anemometry
Author(s) -
Ljungqvist Mattias,
Rasmuson Anders
Publication year - 2004
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.5450820209
Subject(s) - impeller , mechanics , phase (matter) , flow (mathematics) , slip (aerodynamics) , materials science , fluid dynamics , two phase flow , slip factor , laser doppler velocimetry , physics , thermodynamics , medicine , blood flow , quantum mechanics
The phase‐Doppler technique has been used to characterize the two‐phase flow of liquid and particles in a stirred vessel agitated by a pitched blade turbine. The number of measurement locations used is considerably larger than in previous investigations and the behaviour of four different types of particles is studied. The fluid phase and particle phase flow is studied with particular emphasis on the relative velocities of the two phases. The largest slip velocities in the tank were found just beneath the impeller, and large slip velocities generally coincide with large velocity gradients. Generally, particles lag in relation to the fluid when the fluid flow is directed upwards, and vice versa, but exceptions to this are not unusual.