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# midterm - MAE101B FIRST MIDTERM(Aug20 th Unless otherwise...

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Unformatted text preview: MAE101B FIRST MIDTERM(Aug20 th ) Unless otherwise noted the friction factor f refers to the Darcy friction factor, f = f D = ( Δ p/L)D/[½ ρ V 2 ]; and V refers to the average velocity. ------------------------------------------------------------------------------------------------------------------------------ (#1-15pts) Please choose the best multiple choice answer (only one best) provided below. All questions are related to the figure below of flow in the entrance region of a pipe. (5 pts) The downstream (starting at the inlet and going to the right) evolution of the pipe wall shear stress can be best describes as: (a) Continually increasing downstream (b) Continually decreasing downstream (c) Constant (d) Continually decreasing until the flow becomes fully developed, then constant thereafter (e) Continually increasing until the flow becomes fully developed, then constant thereafter (f) Constant until the flow becomes fully developed, then continuously increasing thereafter (g) None of the above (i.e. all the above are wrong) (5 pts) The downstream (starting at the inlet and going to the right) evolution of the pipe centerline velocity can be best describes as: (a) Continually increasing downstream (b) Continually decreasing downstream (c) Constant (d) Continually decreasing until the flow becomes fully developed, then continually increasing (e) Continually increasing until the flow becomes fully developed, then constant thereafter (f) Constant until the flow becomes fully developed, then continuously increasing thereafter (g) None of the above (i.e. all the above are wrong) (5 pts) The downstream (starting at the inlet and going to the right) evolution of the static pressure (measured at the wall) in the pipe can be best describes as: (a) Continually increasing downstream (b) Continually decreasing downstream (c) Constant (d) Continually decreasing until the flow becomes fully developed, then continually increasing (e) Continually increasing until the flow becomes fully developed, then constant thereafter (f) Constant until the flow becomes fully developed, then continuously increasing thereafter (g) None of the above (i.e. all the above are wrong) (#2 – 10 pts) The relationship between the Fanning friction factor f...
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midterm - MAE101B FIRST MIDTERM(Aug20 th Unless otherwise...

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