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Basics of Fluid Mechanics, 2014a

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9.6. APPENDIX SUMMARY OF DIMENSIONLESS FORM OF NAVIER–STOKES EQUATIONS321<br />

2. An airplane 100[m] long is tested by 1 [m] model. If the airplane velocity is<br />

120 [m] and velocity at the wind–tunnel is 60 [m], calculate the model and the<br />

airplane Reynolds numbers. You can assume that both model and prototype<br />

working conditions are the same (1[Bar] and 60 ◦ C).<br />

3. What is the pipe diameter for oil flowing at speed <strong>of</strong> 1[m/sec] to obtain dynamic<br />

similarity with a pipe for water flowing at 3 [m/sec] in a 0.02[m] pipe. State your<br />

assumptions.<br />

4. The pressure drop for water flowing at 1 [m/sec] in a pipe was measured to be<br />

1[Bar]. The pipe is 0.05 [m] diameter and 100 [m] in length. What should be<br />

velocity <strong>of</strong> Castor oil to get the same Reynolds number? What would be pressure<br />

drop in that case?

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