Which of the following describes the orificemeter?

Which of the following describes the orificemeter? Correct Answer A pipe has a circular plate with a hole inside it

Explanation:

Orifice meter:

• The orificemeter, venturimeter and flow nozzle work on the principle of constant area variable pressure drop i.e. the area of obstruction is constant, and the pressure drop changes with the flow.
• An orifice meter is essentially a cylindrical tube that contains a plate with a thin hole in the middle of it.

• The thin hole essentially forces the fluid to flow faster through the hole to maintain the flow rate.

• The point of maximum convergence (vena-contracta) usually occurs slightly downstream from the actual physical orifice. 

  This is the reason why orifice meters are less accurate than venturi meters.

• Beyond the vena contracta point, the fluid expands again and velocity decreases as pressure increases.