100%(1)1 out of 1 people found this document helpful
This preview shows pages 1–3. Sign up to view the full content.
Critical Heat Flux 02 1A boiling channel has operating characteristics listed below. Assuming the heat flux profile is ⎟⎠⎞⎜⎝⎛′′=′′Hzqzqπsin)(0Determine 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 ⎟⎟⎠⎞⎜⎜⎝⎛+=bLaLDDxcritcritehcritwhere hDis the heated diameter and eDis the equivalent diameter for the channel. The parameters in the CISE correlation are: ⎪⎪⎩⎪⎪⎨⎧−×>−−×≤−×+=−−33/1334)/1(3375)1000/(/1)/1(3375)/1(10481.111ccccPPGGPPPPGGPPa4.14.0)1/(199.0GDPPbc−×=G = kg/m2-s D = m P = MPa Pc= Critical Pressure (Mpa) Lcrit= m Problem DataMaximum Heat Flux 354,000 Btu/hr-ft2Channel Mass Flux 1.13 x 106lbm/hr-ft2Rod 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
has intentionally blurred sections.
Sign up to view the full version.