Hydraulics and Fluid Mechanics in ME
In case of an airfoil, the separation of flow occurs

at the extreme front of body
any where between rear and front of body depending upon Reynolds number
at the extreme rear of body
midway between rear and front of body

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Hydraulics and Fluid Mechanics in ME
The hammer blow in pipes occurs when

The flow of fluid through the pipe is gradually brought to rest by closing of the valve
The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
The pipe bursts under high pressure of fluid
There is excessive leakage in the pipe

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