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Lab-4-_Momentum_flux-Dipa - • Negligible lateral...

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Lab - 4 Momentum Flux Determine forces on a surface due to a jet impinging on it Over what ranges of forces can good agreement (consistently less than 10% ) be expected with each deflector Over what range of forces consistently produced differences of more than 10 % with a particular deflector Did you observe anything that can explain these large differences Suggestions for improvement ± ±
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To investigate the interaction between reactive forces and directional changes in momentum flux we use the momentum apparatus: V 2 F = mg α V ) cos 1 ( 2 α ρ - = A Q F These equation is derived from Newton’s 2nd law of motion, Bernoulli, and the continuity equation ……………..(1) F = Reactive vertical force on the target = mg Q = discharge from the jet = V/t A = area of the jet = D= diameter of jet= 8 mm = angle of the exiting jet= 30,90 and 120 degree Where, 4 2 D π α V1 V 2
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Assumptions Constant external pressure on the fluid jet so that the pressure in the fluid remains constant as it moves over a deflector Frictional resistance due to fluid-deflector interaction is negligible
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Unformatted text preview: • Negligible lateral spreading of plane jet • Negligible weight of control volume • Calculate the flow rates • Calculate Km and Kt • Compare Km and Kt • Find error between K m and K t • Plot Km and Kt with alpha Km= Measured , Kt= Theoretical Analysis α ρ cos 1 / cos 1 / ) cos 1 ( 2 2 2-= =-=-= Kt A Q F K A Q F A Q F m Table Target Mass(g) Force(N) Volume (L) Time(S) Q K m Kt Error( %)= ( Km-Kt/Kt) 30 30 30 30 30 30 90 90 90 90 90 90 90 120 120 120 120 120 120 120 Convert degree to radian to calculate Kt Plot 0.4 0.8 1.2 1.6 2 20 40 60 80 100 120 140 Alpha (degrees) kt, km km kt Memo • Individual Submission • One page long • Look at CE321 webpage for sample memo • Attach Results, datasheet and sample calculation • Remember your Audience !!! Highly Technical so come straight to the point • Make sure you address all the questions...
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