Conclusion Of Impact Of Jet

1711 Words 7 Pages
Exp # 7
Impact of Jet
Objectives :
• Study the relation between the force produced and the change of momentum when a jet strikes a vane.
• Compare between force exerted by a jet on a flat plate and on a hemispherical surface.
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For clear observation, both nozzle and test plate are contained in a transparent cylinder. The apparatus is leveled for test using the plastic screwed ball feet provided on the base legs.
A drain tube, in the base of the cylinder vessel, is used to direct the water to the weigh tank of the H1 or H1D Bench where the flow can be accurately measured.

Procedure :
1. The lever was set to is balanced position with the jockey weight is at its zero position.
2. The water valve was opened to it max, and the jockey was repositioned so that the lever is back to its balanced position.
3. The water tank was emptied of water and the refilled to take reading of time versus volume which was used to calculate the volumetric rate of flow. 4. A series of reading for the similar procedures was taken for the flat plate with reducing the rate of flow in each reading by using the valve. 5. The same steps were then repeated by using the hemispherical cup and the vane instead of the flat plate.

Results: * for Flat : Y | V | T | Q | ṁ | u1 | uₒ | J | F(theory) | F(exp) | Error % | 20 | 0.005 | 23.79 | 0.00021 | 0.025 | 2.67 | 2.54 | 0.063 | 0.78 | 0.62 | 20.8
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The ratio between measured force and the theoretical maximum may be regarded as an efficiency of the vane, 0.96 in this case, and will always be less that 1.00 because losses will always occur in practice.
As a conclusion, the calculated force is correlated with the measured force. Both of the forces will have directly proportional relation. Theoretically, the calculated force should be the same as the measured force. However, this cannot be achieved experimentally due to the errors made during the experiment. Form this experiment, the flow rate for the hemisphere is found to be the lowest and thus require a longer time for the volumetric tank to rise from 20 to 30 litres.
1- Fluid lab manual 2-

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