COLLISIONAL VISCOSITY OF FCC PARTICLES IN A CFB

Particle velocity distributions were measured for a flow of 75-mu m FC C particles in a CFB using a new video-digital camera technique. From the spread of particle histograms, a random oscillating particle veloc ity was determined This random velocity was used to compute the powder viscosity with the help of dense-phase kinetic theory of granular flo w. There was excellent agreement between this kinetic-theory measureme nt and previous macroscopic viscosity measurements. The dimensionless group kinematic viscosity divided by the oscillating velocity and part icle diameter correlated all available data as a function of particle volume fraction.