Y. Wang et al., RADIAL PROFILES OF SOLIDS CONCENTRATION AND VELOCITY IN A VERY FINE-PARTICLE (36 MU-M) RISER, Powder technology, 96(3), 1998, pp. 262-266
Radial profiles of fine particle (36 mu m) concentration and velocity
in a riser of 140 mm inner diameter are investigated using a dual-beam
optical density sensor and a laser Doppler velocimeter. According to
the cross-sectional average solids fraction three different kinds of r
adial solids fraction profiles an present: uniform, dense ring and agg
regation. At high superficial gas velocity and low solids concentratio
n, the radial profiles of fine particle velocity obey a 1/7 power law.
The radial profiles of solids fraction and velocity become flatter as
the particle size decreases from 54 to 36 mu m. (C) 1998 Elsevier Sci
ence S.A. All rights reserved.