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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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