examII_s2008_soln

examII_s2008_soln - Name:_ MAE 4800 Exam II May 14, 2008...

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Name:_____________________________ MAE 4800 Exam II May 14, 2008 Open notes Open book Closed neighbors Open mind Notes: Start exam when instructed – you will be given 120 minutes to complete the exam Write name at top of each page and any additional pages Read each problem carefully – if you still do not understand, ask Read the problem again – note what is being asked Clearly state all assumptions Clearly show all your work, commenting on what you are doing – keep in mind that your exam communicates to those who are grading what you know To maximize points, plug in numbers at the end – solve algebraically first Reference table you are using for properties Good luck! Potentially Useful Information: ρ [kg/m 3 ] 1.23 C p [kJ/kgK] 1.009 μ [kg/ms] 1.79E-05 ν [m 2 /s] 1.46E-05 k [W/mK] 3.00E-02 α [m 2 /s] 2.99E-05 Pr 7.00E-01 R [kJ/kgK] 2.89E-01 Air Properties Water Properties ρ [kg/m 3 ] 980 Cp [J/kgK] 4200 μ [Ns/m 2 ] 5.28E-04 ν [m 2 /s] 5.39E-07 k [W/mK] 0.66 α [m 2 /s] 1.6E-07 Pr 3.36 ρ [kg/m3] 8954 C [J/kgK] 383.1 k [W/mK] 386 α [m2/s] 1.12E-04 Copper Properties Ideal Gas Law: RT p ρ = Forced Convection Correlations Flow over a flat plate 33 . 0 5 . 0 L Pr Re 664 . 0 k hL Nu = = Re L < 5E5 Flow over a single circular cylinder ( 29 [ ] 5 4 8 5 D 25 . 0 66 . 0 33 . 0 5 . 0 D 000 , 282 Re 1 Pr 4 . 0 1 Pr Re 62 . 0 3 . 0 k hD Nu + + + = = 10 2 < Re D < 10 7 Flow over a sphere MAE 4800, Spring 2008 5/14/08
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Name:_____________________________ 6 . 0 D Re 37 . 0 k hD Nu = = 17 < Re D < 70,000 MAE 4800, Spring 2008 5/14/08
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Name:_____________________________ Problem 1 (50 points) Factorial Analysis Fun A pressure sensor vendor claims that he has a new sensor design based on strain gauges that is not sensitive to changes in the local ambient temperature or changes in the relative humidity (RH). Your boss does not believe these claims and has asked you to conduct a series of experiments to determine if the vendor claims are true or not. You decide to conduct a factorial study based on the design shown in the Table below. Test Case
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examII_s2008_soln - Name:_ MAE 4800 Exam II May 14, 2008...

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