Terminal particle velocity Single spheres

Temperature rise, centrifugal pump, 207-209 Terminal particle velocity, 228, 230 Particles, different densities, 238 Single spheres, 274 Solids in air, 237 Solids in water, 237 Test pressure, piping, 18 Thickeners and settleix/decanters, Decanter, 242... 

In concentrated suspensions, the settling velocity of a sphere is less than the terminal falling velocity of a single particle. For coarse (non-colloidal) particles in mildly shear-thinning liquids (1 > n > 0.8) [Chhabra et al., 1992], the expression proposed by Richardson and Zaki [1954] for Newtonian fluids applies at values of Re(= up to about 2 ... 

The equations for minimum fluidization velocity are similar to those for the terminal velocity of a single particle, and it is instructive to examine the ratio of these velocities. For small spheres, the equation for Stokes law divided by Eq. (9.2) gives... 

The single particle terminal velocity of the spheres in water may be taken as 1.1 mm/s. Calculate ... 

It is worthwhile to note that at both small and large Archimedes numbers, the minimum fluidization velocity, t/jjif, is directly proportional to the corresponding terminal velocity, Ut, of a single spherical particle of diameter in an infinite medium. For small spheres where the Stokes law applies, Ut/U ( approaches 74. For large spheres in the Newton s law regime, Ui/U ni approaches 8.6. 

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