Answer / karthick

when there is a sudden stoppage of flow in a pipe then the
pressure wave is generated inside the fluid which travels
in opposite direction and it collides with the surface of
the pipe wall.This is called water hammering

Answer / syed ahsan

There is another Phenomena in water hammer that when Hotter fluid mixes with colder then due to temperature the dense and lighter water molecules collide with each other with heavy sound.When steam mixes with colder pipe work in condensate pipe work it happens there too.

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