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examII_w2004_soln - Name MAE262 Exam II Open notes Open...

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Name:_____________________________________ MAE262 Exam II May 13, 2004 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 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! Gary L. Solbrekken MAE262, Winter 2004 5/13/04
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Name:_____________________________________ Problem 1 (65 points) A heat sink was characterized using the wind tunnel shown in Figure 1. The measured thermal resistance was plotted against the air flow velocity in the plot shown in Figure 2. Figure 1. Heat Sink Characterization Test Set- Up 0 0.1 0.2 0.3 0.4 0.5 0.6 0 0.5 1 1.5 2 2.5 3 3.5 Air Approach Velocity [m/s] Heat Sink Thermal Resistance [K/W] Figure 2. Measured Thermal Resistance of Heat Sink Part 1 (20 points) – If the blower for the current design is limited to delivering an air velocity of 1.5 m/s, what is the maximum heat flow that can be dissipated if the heat sink temperature must be kept below 70 o C in a 45 o C ambient.
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