A. Ginestet et al., HYDRODYNAMICS OF A FLOWING GAS SOLIDS SUSPENSION IN A TUBE AT HIGH ANGLES OF INCLINATION, Canadian journal of chemical engineering, 71(2), 1993, pp. 177-182
A study was made of pneumatic transport of particles of sand suspended
in air in a 31.8 mm diameter Plexiglas tube inclined at either 72 or
90 degrees with respect to the horizontal plane. The solids holdup. pr
essure gradient and pressure drop fluctuations over a 4.55 m test sect
ion were measured as functions of the air velocity and the solids flux
. Previously observed sudden changes in slope of plots of solids holdu
p versus solids flux at constant gas velocity in a vertical tube (Mok
et al., 1989), which were identified as transition points between dilu
te and dense phases, were confirmed and extended to inclined tubes. Br
eaks were also found in plots of pressure drop fluctuations versus sol
ids flux at constant gas velocity.