Incipient carrier fluid velocity for particulate flow in a holding tube
1995
Grabowski, S. | Ramaswamy, H.S.
The incipient or start-up fluid velocity of water and starch suspensions (2 and 4%) containing discrete food particles (carrot, parsnip, and potato cubes) as well as nylon spheres was investigted in the following range of conditions: temperatures of 80, 100 and 110 degrees C; particle sizes for spheres of 19.1, 12.7, 9.53 and 6.35 mm diameter and for cubes of 12.7, 10 and 7.6 mm; tube diameters of 29.5, 41.3 and 54.6 mm; a tube length of 1.2 m; and a tube inclination of upward 1.19 degrees. The incipient velocity was found to be a function of the fluid effective viscosity, the particle-to-fluid density simplex (a), the particle-to-tube diameter ratio (d(e)/D) and the sphericity of the particle (psi). The following regression equation (R2=0.94) described the dimensionless correlation: GR(e)(0) = 0.0056Ar(0.615) (d(e)/D)-0.07 psi(-8.5), where GR(e)(0) is the generalized incipient Reynolds number and AR is the Archimedes number, both with tube diameter D as the characteristic dimension. Viscosity of the carrier fluid showed a much stronger influence, resulting in dampening of the density effect on incipient velocity.
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