HW2Problem1

# HW2Problem1 - A boiling channel has operating...

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Critical Heat Flux 02 1 A boiling channel has operating characteristics listed below. Assuming the heat flux profile is = H z q z q π sin ) ( 0 Determine the critical power ratio in the channel using both the Hench-Levy and CISE-4 correlations. You may assume for the Hench-Levy correlation, that the critical power corresponds to the condition where the minimum critical heat flux ratio is one. The CISE-4 critical boiling length correlation is + = b L aL D D x crit crit e h crit where h D is the heated diameter and e D is the equivalent diameter for the channel. The parameters in the CISE correlation are: × > × × + = 3 3 / 1 3 3 4 ) / 1 ( 3375 ) 1000 / ( / 1 ) / 1 ( 3375 ) / 1 ( 10 481 . 1 1 1 c c c c P P G G P P P P G G P P a 4 . 1 4 . 0 ) 1 / ( 199 . 0 GD P P b c × = G = kg/m 2 -s D = m P = MPa P c = Critical Pressure (Mpa) L crit = m Problem Data Maximum Heat Flux 354,000 Btu/hr-ft 2 Channel Mass Flux 1.13 x 10 6 lbm/hr-ft 2 Rod Pitch 0.640 inches Rod Diameter 0.493 inches Channel Pressure 1000 psia Channel Height 148 inches Inlet Temperature 532 F SOLUTION The critical power ratio for the channel is

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