Fluid Mechanics
Foot valves are provided in the suction line of a centrifugal pump to

Remove the contaminant present in the liquid
Minimise the fluctuation in discharge
Control the liquid discharge
Avoid priming, every time we start the pump

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Fluid Mechanics
The Prandtl mixing length is

Zero at the pipe wall and is a universal constant
Useful for computing laminar flow problems
Independent of the shear stress
Independent of radial distance from the pipe axis

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