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Unformatted text preview: Which flow is more likely to be turbulent? Why? 8. What is the hydraulic diameter? How is it defined? What is it equal to for a circular pipe of diameter D ? 9. How is the hydrodynamic entry length defined for flow in a pipe? Is the entry length longer in laminar or turbulent flow? 10. Consider laminar flow in a circular pipe. Will the wall shear stress w be higher near the inlet of the pipe or near the exit? Why? What would your response be if the flow were turbulent? 11. How does surface roughness affect the pressure drop in a pipe if the flow is turbulent? What would your response be if the flow were laminar? 12. Derive the equation for the velocity profile in the annulus shown in the figure below. The steady flow is fully developed and v = w = 0. Hint: Use the xmomentum equation...
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 Summer '09
 ABBITT
 Fluid Dynamics, circular pipe

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