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Unformatted text preview: flow in the entire duct, and determine the Nusselt number from 79 . 57 ) 7331 . ( ) 775 , 20 ( 023 . Pr Re 023 . 4 . 8 . 4 . 8 . = = = = k hD Nu Heat transfer coefficient is C . W/m 82 . 11 ) 79 . 57 ( m 12 . C W/m. 02454 . 2 = = = Nu D k h The logarithmic mean temperature difference is determined from [ ] C 535 . 5 m) 20 ( m) 12 . ( ) C . W/m 82 . 11 ( W 1 . 493 ln ln 2 ln = = = T T T hA Q s & Then the pipe temperature is determined from the definition of the logarithmic mean temperature difference C 3.8 = = = s s s i s e s i e T T T T T T T T T T 5 19 ln 5 19 C 535 . 5 ln ln 859...
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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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