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Unformatted text preview: ENU 4134 Convection to Coolant and Full SingleChannel Analysis Part II D. Schubring November 13, 2009 (Driving Towards) SingleChannel Analysis I Conduction in fuel 1+ I Gap conductance 1 I Conduction in cladding << 1 I Convection to coolant 23 Included in these final notes (in several parts) is the full singlechannel analysis problem Convection to Coolant I General equation for T co T m I Singlephase coolant, constant properties & heat transfer coefficient (analytical solutions) I Singlephase coolant, variable properties & heat transfer coefficient (numerical solution) I Twophase coolant I Miscellanea I Engineering judgment and singlechannel analysis In this set of notes (part 2), well develop a simple numerical scheme for singlechannel analysis (singlephase or twophase coolant). Outline of Numerical Scheme I Divide channel axially into a sufficient number of control volumes. I Start with entrance conditions and march through the control volumes. I Perform an energy balance in the coolant flow in, flow out, heat flux out of rod to compute outlet temperature. I Compute a heat transfer coefficient and apply the equation for T co T m to find T co . I Compute a mean cladding conductivity and apply the equation for T ci T co to find T ci . I Compute a gap conductance and apply the equation for T fo T ci to find T fo . I Compute a fuel mean conductivity and apply the equation for T m T fo to find T m I Estimate P in the control volume. Opening Remarks T m , T co , T ci , T fo & T max will be found at the control volume boundaries . Some other parameters are computed at control volume centers . To use this numerical scheme, we need to know m , P m , in , and T m , in . If T m , out is given in lieu of m , another calculation (integration, potentially numerical integration) would need to be performed first to get m ....
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This note was uploaded on 07/14/2011 for the course ENU 4133 taught by Professor Schubring during the Spring '11 term at University of Florida.
 Spring '11
 Schubring

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