Answer / maurya gyanprakash

it's very simple just insert dye in it by seeing the
direction of dye movement one can easily tell the direction
flow.

Answer / ct santhosh kumar

It is a closed pipe , u cant see dye flow ..
So , fix a a flow meter like Rotameter (no pressure gauge ) .. in one direction if it reads then u know the direction of flow , if it doesn't , then the flow direction is reverse .

Answer / jay prakash

we can check the flow direction by pitat tube.

Answer / jayesh

even simple than all the above mentioned procedures just pass a light through the pipe
i mean torch it with ur cell phone
u will see the light will get dispersed in the dirn of motion of fluid
u might also see the particles motion n thus determine the flow direction

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