Spherical particles of density 2000 kg/m3 and in the size range 20– 100 mm are fed continuously into a stream of water (density, 1000 kg/m3 and viscosity, 0.001 Pa s) flowing upwards in a vertical, large diameter pipe. You would like the velocity of the water be such that no particles greater than 50 mm are carried upward with the water. Determine the:   a) maximum velocity of the water in m/s (Correct Answer: 1.218) b) if the water velocity was 85 % of the maximum, what diameter (mm) particles will be 100 % retained with the underflow? (Correct Answer: 36.13) I need help with how to get the answers please.

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Fluid Dynamics

The study of the flow of gases and liquids, usually in and around solid surfaces, is known as fluid dynamics in physics and engineering. Fluid dynamics, for example, can be used to evaluate the movement of air through an airplane wing or the surface of a vehicle. It can also be used in ship design to increase the speed at which ships pass through water.