Impact of a Jet

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EG-125 Civil Labs II


Main Report: Impact of a Jet

Team:B Evans 640786
T Denham 636120
J Cheetham 650261
J Davies 622673

Impact of a Jet
* The force produced and measured by this experiment can be used to produce energy in hydroelectric turbines. * The aims in this experiment were to:
* Determine the force applied by the jet to the plate
* Compare the experimental result to the theoretical values, showing that the force exerted on the plate by the jet is equal to the rate of change of momentum in the jet. Theory:
-theoretical: Normal force on the plate (Fx)=ρQV1 where ρ=density, Q=flow, V1=the x component of velocity of the fluid. -experimental: force due to the jet= xw/L where L=0.151m and w=0.5kg Procedure: -adjust the weight to set distance(see results table)

-open the valve so that the force provided by the jet causes equilibrium in the system. -record the time taken for 0.006m3 of water to collect in the tank. -from this determine the flow rate (volume/time)

-use the formulae mentioned in the theory section to determine the experimental and theoretical values for the force. -repeat these stages for at least 4 more values of x (spacing 2cm between readings recommended). Results:

Conclusion: the experimental results are not far off the theoretical values with my maximum percentage error being 33%

References: EG160 course notes
EG125 civil lab handout

Aims: To determine the discharge-head relationship for a triangular weir by comparing experimental results (Qreal ) and theoretical values (Qideal) to calculate CD (coefficient of discharge) Results:

Conclusions: the percentage error of the results [(Qideal-Qreal)/Qideal] ranges from 0% to 30% with the average % error being 16.54%

Venturi Tube
Aims: To investigate Bernoulli’s...
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