HW1Problem01

HW1Problem01 - For the BWR operating parameters given below compute and plot a The clad surface temperature assuming the Jens-Lottes Correlation b

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Boiling Heat Transfer 22 1 For the BWR operating parameters given below, compute and plot: a) The clad surface temperature assuming the Jens-Lottes Correlation b) The clad surface temperature assuming the Thom Correlation c) The clad surface temperature assuming the Chen Correlation You can neglect the mixed boiling region and assume the transition point from single phase forced convection to nucleate boiling in the Jens-Lottes and Thom Correlations occurs at that point z b , such that m m b sat c b b z q T h z q z T 1 1 6 10 ) ( ) ( ) ( + = + ς i.e., the wall temperature is continuous at the transition point. In the Chen correlation, substitute the Weisman correlation for the Dittus-Boelter correlation in o h A . Discuss your results. BOILING WATER REACTOR PARAMETERS Channel Heat Input 350,000 Btu/hr Channel Mass Flux 1.42 x 10 6 lbm/hr-ft 2 Rod Pitch 0.640 inches Rod Diameter 0.493 inches Channel Pressure 1000 psia Channel Height 146 inches Inlet Temperature 532 F H z H H z H q z q ) - ( sin ) - ( = ) ( 0 π
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Boiling Heat Transfer 22 2 SOLUTION The channel heat input defines the amplitude of the heat flux profile. For D H q x x x HD q Ddx x x q H Ddz H z H H z H q Ddz z q q H H π 0 0 0 0 0 0 0 0 )] cos( ) [sin( ) sin( ) ( sin ) ( ) ( = = = = = The amplitude of the heat flux profile is then 0 2 350,000 Btu 222,900 0.493 146 hr-ft 12 12 q q DH ′′ == = ×× The fluid properties assumed for this problem are f ρ = 46.318 g = 2.242 f μ = 0.2327 g = 0.047 f k = 0.3273 σ = 0.0012 sat T = 544.58 f h = 542.6 fg h = 650.4 The coolant enters the channel subcooled, such that the potential exist for single phase forced convection over some portion of the channel. The outer clad surface temperature (in the absence of boiling) is given by Tz Tz q z h co c () =+ where the fluid temperature distribution is given by + = z pf z Dd z q C m T z T 0 ) ( 1 ) 0 ( ) ( ± or
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Boiling Heat Transfer 22 3
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This note was uploaded on 12/08/2010 for the course NE 402 taught by Professor Doster during the Fall '08 term at N.C. State.

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HW1Problem01 - For the BWR operating parameters given below compute and plot a The clad surface temperature assuming the Jens-Lottes Correlation b

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