midterm_prob1

# midterm_prob1 - Midterm MAE 120 Spring 2009 Name 2 Z 2...

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Unformatted text preview: Midterm, MAE 120, Spring 2009, Name: 2: Z 2 ‘24: (20) 1. For full credit, he sure to use complete sentences for those questions that requlre d , narrative answers. Some helpful equations can be found in the Equations section. (If you on t recall the answer immediately, it is generally a good idea to move on and then return to the unanswered question after you have ﬁnished the rest of the test.) (4) 1a. What are the two main goals that motivate the study of heat transf r? I frieze mam 9 ﬂea-.2” r5 5939 demmxu a; mil)»: Q JVW ﬂ”? {mar/é garb? zs‘ Qév dgﬁwzm/M @ﬂmﬁra (Jasqzhévq/W féfb’w ism @wMaQé/M.Mﬂ £4 (4) 1b. Deﬁne the term isotherm and provide a proof using appropriate equations that heat ﬂux must be perpendicular to isotherms. .414 1'me (5 6c il/M M Andras: cf p059; M @536 Q’e-rw/Qwaﬂgme 5W A4 elf/\$047 ﬂewsz‘céa: W [519%“IM 49a ﬁt I (we #9 ('MA% gyaél’w m 9/1 haw M» 24/ 944/ wwmﬂ c219 ‘% a 3:1 Mg 44:! ﬁMﬁf'S/D My: gym-91‘ W7 ' a 24 Ari-lg rm ,3 a. _, or or '4 i5 5K5?! +53%“ “’“kasi {311w M 50% 92W :9: ’3 dad-29mg Gina/me. 294W?)- “\$530 (4) 1o Assume that the axial temperature distribution, the}, for a rectangular tin of width, w, thickness, I, and ieagth, L, is known. Describe, using complete sentences and using equations as an aid, two approaches that can be used to determine the heat transfer from the fin. (We do want to see computing equations in your narrative that involve Tat/l.) 5/5445 WW.) /9 ,réHﬂ-tcﬂq gas-ad a“: 'JA‘LZ .xfa‘uﬂ AoaaK-é'g "Amp/sz »mua¢ (99m %ﬂaa3,4ﬂ gig ﬂat 3:? 5&3” 3' iii—L39 r Alwwagﬂfvééc aid (2‘44! MQ'e7mfia 81/20}: (ML m J6 {Md/lei? Q0“: 24 52' ﬂzﬁmﬂu is” = ftp/2w ~ was -+- awed 2571) as) Midterm, MAE 120, Spring 2009, Name: Zﬂﬁ'ﬂ (4) 1d. What is the physical interpretation of the Biol number and the mathematical implication of low and high values of the Biot number? - ' . is 3.. (Mu 7” 3"” / P’ﬁtﬁy rte/m a5 ave ,. ; ¢ :5 .3418 Hf -\ 3 J Ca 5’, Bo r: .75; " 24—2 . E—gga PM Beet-’0) W 6289va TIMI—TTQQ wig/4 4m 5525' (4) 16. Using complete sentences, what is the meaning of the term, ﬁn efﬁciency? What is the range of possible values? For a rectanguiar tin of constant cross-section ('14,; = Aw = wot where w is the width and r is the thickness) and for the inﬁnite tip condition, under what conditions will the efﬁciency be high? Recall that r 4: w for the ﬁn effectiveness to be high. art fé-QOA 0/92 5996M M r J!) % 2956 was 30%; 64W, aegis Q4» max/mum i049 5-92 [ﬂy 39:9 draws /MM WW W up anti/{act 3 5; h A; 5 gram) «739) HW (2,)“ Wﬁﬁ pesslb/v? Wrin 15 0 71-22), @qummztﬂg W!- éﬂMzgaM 429M 4% ‘71:? I ‘74"! [if-{1014? :3, mg. nﬁ‘iﬂ 51\$: 80- .=' ‘ ﬁrst" .L-j/zr 1:7 71C lap-l '— L gagwt— ...
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midterm_prob1 - Midterm MAE 120 Spring 2009 Name 2 Z 2...

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