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# Experiment (5) Flow through small orifice - PowerPoint PPT Presentation

Experiment (5) Flow through small orifice . By: Eng. Motasem M. Abushaban. Eng. Fedaa M. Fayyad . Introduction . 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.

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### Experiment (5)Flow through small orifice

By:

Eng. Motasem M. Abushaban.

• 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)

Theory

• 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]