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Unformatted text preview: Properties The properties of air at 1 atm and 1 atm and the film temperature of ( T s + T )/2 = (85+30)/2 = 57.5 C are (Table A15) 12 5 K 003026 . K ) 273 5 . 57 ( 1 1 /s m 10 871 . 1 = + = = = f T Analysis The characteristic length is the height of the plate, L c = L = 5 m. The Grashof and Reynolds numbers are = = = = = = V V L V L T T g Gr s 5 2 5 11 2 2 5 31 2 2 3 10 67 . 2 /s m 10 871 . 1 ) m 5 ( Re 10 829 . 5 ) /s m 10 871 . 1 ( ) m 5 )( K 30 85 )( K 003026 . )( m/s 81 . 9 ( ) ( Air T = 30 C V Plate, T s = 85 C L = 5 m and the forced motion velocity above which natural convection heat transfer from this plate is negligible is m/s 9.04 = = = V V Gr 1 . ) 10 67 . 2 ( 10 829 . 5 1 . Re 2 5 11 2 971...
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This note was uploaded on 01/24/2012 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

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