Thermodynamics HW Solutions 803

Thermodynamics HW - is Temperature jump C 1762 ° = − = − = Δ 109 1871 crit film s s T T T Note that the film temperature is(1871 100/2=985 °

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Chapter 10 Boiling and Condensation ) ( 4 3 ) ( ) ( )] ( 4 . 0 )[ ( 62 . 0 4 3 4 sat 4 sat 4 / 1 sat 3 rad film total T T T T T T D T T C h gk q q q s s s v sat s pv fg v l v v + + = + = εσ μ ρρ ρ Substituting, [] 4 4 4 2 8 4 / 1 5 3 3 ) 273 100 ( ) 273 ( ) K W/m 10 67 . 5 )( 5 . 0 ( ) 100 ( ) 100 )( 003 . 0 )( 10 762 . 4 ( )] 100 ( 2471 4 . 0 10 2257 )[ 1725 . 0 9 . 957 )( 1723 . 0 ( ) 1362 . 0 ( 81 . 9 62 . 0 000 , 153 , 1 + + × + × × × + × = s s s s T T T T Solving for the surface temperature gives T s = 1871 ° C. Therefore, the temperature jump of the wire when the operating point jumps from nucleate boiling to film boiling
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Unformatted text preview: is Temperature jump: C 1762 ° = − = − = Δ 109 1871 crit , film s, s T T T Note that the film temperature is (1871+100)/2=985 ° C, which is close enough to the assumed value of 1000 ° C for the evaluation of vapor paroperties. 10-15...
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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.

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