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Experiment (5) Flow through small orifice

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Experiment (5)Flow through small orifice

By:

Eng. Motasem M. Abushaban.

Eng. Fedaa M. Fayyad.

- An Orifice is an opening in the side or base of tank or reservoir through which fluid is discharge in the form of a jet.
- The discharge will depend upon the head of the fluid (H) above the level of the orifice.
- The term small orifice means that the diameter of the orifice is small compared with the head producing flow.

- Studying the flow through small orifice discharging to atmosphere.
- Calculating the coefficient of discharge (Cd).
- Calculating the coefficient of velocity (Cv).
- Calculating the coefficient of contraction (Cc)

,

- Two reasons for the difference between theoretical and actual discharge.
- First: The velocity of jet is less than the velocity calculated because there is losses of energy between point A and B.
,Cvis the coefficient of velocity

- Second: The stream line of the orifice contract reducing the area of flow. (Vena Contraction)
Where. Ccis the coefficient of contraction.

Cd in the range [0.6-0.65]

- Data & Results: