Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

Cc =1 for external mouthpiece.

Yes, Cc=1 for external.

What are the values of Cc and CV?

The pressure difference between the upstream end if the cone and the throat is measured and provides the signal for the rate of flow. Because of the gradual reduction in the area, there is no vena contracta and the flow area is a minimum at the throat so that the coefficient of contraction is unity.

Why the ideal value of the coefficient of contraction is 1 for the mouthpiece? Please explain.

Is CD has range in case of external mouthpiece?

A mouthpiece is a short tube of length not more than two to three times its diameter, which is fitted to a tank for measuring discharge of the flow from the tank. By fitting the mouthpiece, the discharge through an orifice of the tank can be increased. Mouthpieces are classified on the basis of their shape, position and discharge conditions.

According to the shape, they may be classified as, cylindrical, convergent, divergent and convergent-divergent.

Based on the positions, they may be external or internal mouthpieces with respect to reservoir/tank to which it is connected. An external mouthpiece projects outside the tank whereas the internal mouthpiece projects inside the tank.

On the basis of discharge conditions, they may be classified as running full and running free mouthpieces.

What is mouth piece?

Thanks everyone for the explanation.

Cv is cofficient of velocity.