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Unformatted text preview: 2 9 / 4 16 / 9 4 / 1 8 9 / 4 16 / 9 4 / 1 = + + = + + = Ra Nu 2 2 2 2 m 01131 . m) 06 . ( C . W/m 9 . 967 ) 14 . 89 ( m 06 . C W/m. 6515 . = = = = = = D A Nu D k h s The rate of heat transfer by convection is W 1 . 602 ) 30 )(85 m C)(0.01131 . W/m 9 . 967 ( ) ( 2 2 conv = = = T T hA Q s s & The mass of water in the container is kg .84 39 ) m )(0.040 kg/m 996 ( 3 3 = = = V m The amount of heat transfer to the water is J 10 4.994 = C 15)C)(45 J/kg. kg)(4178 84 . 39 ( ) ( 6 1 2 = = T T mC Q p Then the time the heater should be on becomes hours 2.304 = = = = s 8294 J/s 602.1 J 10 4.994 6 Q Q t & 948...
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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, Mass, Heat

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