Question

The velocity at which the flow changes from laminar flow to turbulent flow is called (a) critical velocity (b) velocity of approach (c) subsonic velocity (d) supersonic velocity 19. When the length of chain used in measuring distance is longer than

Answer 1

Answer:

The velocity at which the flow changes from the laminar to turbulent for the case of given fluid at a given temperature and given pipe is known as critical velocity.

when a chain is used in measuring distance is longer than the standard length, the error in measured length will be negative error because the chain will measure a larger distance than the original distance.

Answer 2

The velocity at which the flow changes from laminar flow to turbulent flow is called CRITICAL VELOCITY.

• First of all, what is laminar/streamline flow?

Streamline flow of fluid is a flow in which all the particles have a same velocity vector at a particular point of the trajectory.

• Then what is Turbulent Flow?

Turbulent flow is when all the particles don't have same velocity at that specific point of the trajectory.

• What quantity defines this change in flow?

REYNOLD'S NUMBER helps us to understand a change in fluid flow from streamline to turbulent.

R < 2000 : Streamline Flow

R > 2000 : Turbulent Flow

After the critical velocity, the Reynolds Number changes above 2000 and fluid flow becomes turbulent.

$\star$ Hope It Helps.