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Quiz 5 Solutions

# Quiz 5 Solutions - -5 01-1th 333 Name Qgﬂchm Quiz 5 Open...

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Unformatted text preview: (-5 01-1th 333 Name: Qgﬂchm Quiz 5 February 11, 2011 Open book quiz. 1. The ﬁns attached to a surface are determined to have an effectiveness of 0.9. Do you think the rate of heat transfer ﬁ'om the surface has increased or decreased as a result of the addition of these ﬁns? Brieﬂy explain your answer CO 9: £19 mm heart “franc/z ha: edge/MW hat-336 b ﬂaw ”315' 0(me ﬂu: 43am 2. Consider two ﬁnned surfaces that are identical except that the ﬁns on the ﬁrst surface are formed by casting or extrusion, whereas they are attached to the second surface afterwards by welding/solderinglgluing. For which case do you think the ﬁns will provide greater enhancement in heat transfer? Brieﬂy explain your answer. Gas-{ma -- n0 mind {ESI‘S'i‘MCL' bah/r hull) “imﬂlﬁfé/L’ (or/[4506's " MAW Wig—(i Fisamcgn mm “4241) Witt-e,» 3. A hot surface at 80°C in air at 20°C is to be cooled by attaching 10-cm long and l-cm diameter cylindrical ﬁns. The combined heat transfer coeﬁcient from the surface (ﬁns and base) is 30 meK, and the heat transfer ﬁ‘om the ﬁn tip is negligible. Ifthe ﬁn efﬁciency is 0.75, calculate the rate of heat loss from 100 ﬁns. Em newt W warm} L= tom m (Zip- 075 gf/Qh’qreb (11%) BSMIU m ' I ,1 0 - ’ I {0M ’20 C, Rssm (”21649. 75X3O+ﬁik ﬂ)((x/O ”401:: X80 ) 1 54941546 3132. 92 Comm Prisca/dim : 4.11., w 3. i-ﬂi (.MvLc/‘bo'hM-F’ak if 4‘ animbcdthh-ip , . fact ‘ I063; ...
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