Lab-4-_Momentum_flux-Dipa

Lab-4-_Momentum_flux-Dipa - Negligible lateral spreading of...

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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 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 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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This note was uploaded on 04/19/2010 for the course CE 321 taught by Professor Mantha,p during the Spring '08 term at Michigan State University.

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Lab-4-_Momentum_flux-Dipa - Negligible lateral spreading of...

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