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Axial‐View Measurements of Particle Motion in a Turbulent Pipe Flow
Author(s) -
Govan Alastair H.,
Hewitt Geoffrey F.,
Terry John W.
Publication year - 1990
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19900070112
Subject(s) - turbulence , mechanics , physics , particle (ecology) , tube (container) , magnetosphere particle motion , flow (mathematics) , phase (matter) , classical mechanics , materials science , geology , oceanography , quantum mechanics , magnetic field , composite material
This paper describes experimental measurements and numerical predictions of the motion of particles of size 500–800 m̈m diameter in a 20 m long (i. e. 620 pipe diameters) vertical tube. The numerical simulations suggest that the particles attain a fluctuating r.m.s. velocity in a direction normal to the axis of the tube which is at least one order of magnitude less than that of the gas phase turbulence fluctuations. However, the measured values are of the same order as the gas phase turbulence fluctuations (i. e. 0.5 to 1 m/s). This discrepancy is likely to occur because of particle/wall interactions and these were investigated in separate experiments. Although the cause of the measured coefficients of restitution in the normal direction being greater than unity was not finally demonstrated, the results indicated strongly that the effects were due to non‐ideal bouncing of the particles in the presence of particle spin.