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Unformatted text preview: T s = 60 C 20 W The convection heat transfer coefficient can be determined from Newton's law of cooling relation for a finned surface. C . W/m 43 . 48 C 25))(60 m (1)(0.0118 W 20 ) ( ) ( 2 2 = = = = s s s s T T A Q h T T hA Q & & Starting from heat transfer coefficient, Nusselt number, Reynolds number and finally freestream velocity will be determined. We assume the flow is laminar over the entire finned surface of the transformer. 4 3 / 2 2 2 3 / 2 2 2 3 / 1 5 . 2 10 171 . 9 ) 7248 . ( ) 664 . ( ) 6 . 180 ( Pr 664 . Re Pr Re 664 . 6 . 180 C W/m. 02681 . m) C)(0.1 . W/m 43 . 48 ( = = = = = = = Nu Nu k hL Nu L L m/s 15.83 = = = = m 1 . ) /s m 10 726 . 1 )( 10 171 . 9 ( Re Re 2 5 4 L L L L V V 720...
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This note was uploaded on 01/22/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Convection, Force, Mass, Heat

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