In 1904, Allen Hazen showed that the efficiency of a sedimentation process was a function of the particle settling velocity, the flow through the tank and the surface area of tank.
22.
Settling velocity W s of a sand grain ( diameter d, density 2650 kg / m 3 ) in water at 20 �C, computed with the formula of Soulsby ( 1997 ).
23.
Wash load grains tend to be very small ( mostly clays & silts but some fine sands ) and therefore have a small settling velocity, being kept in suspension by the flow turbulence.
24.
The increase in biomass concentration that is possible because of the high settling velocity of the aerobic sludge granules and the absence of a final settler result in a significant reduction in the required footprint.
25.
For larger particles ( turbulent particle Reynolds numbers ), fall velocity is calculated with the turbulent Dietrich ( 1982 ) compiled a large amount of published data to which he empirically fit settling velocity curves.
26.
If the particle is falling in the viscous fluid under its own weight, then a terminal velocity, or settling velocity, is reached when this frictional force combined with the buoyant force exactly balances the gravitational force.
27.
The particles'settling velocity in centrifugation is a function of their size and shape, centrifugal acceleration, the volume fraction of solids present, the density difference between the particle and the liquid, and the viscosity.
28.
Because particles settle downward, for all cases where the particles are not neutrally buoyant or sufficiently light that this settling velocity is negligible, there is a net negative concentration gradient as one goes upward in the flow.
29.
If the upwards velocity is much less than the settling velocity, but still high enough for the sediment to move ( see saltating ( jumping up into the flow, being transported a short distance then settling again ).
30.
If the concentration of ice nuclei is seeded such that the resulting cloud particle density is less than that for the natural case, the cloud particles should grow larger due to less water vapor competition and attain higher settling velocities.
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