Numerical Simulation of Flow and Thermal Field in Supercritical Pressure Carbon Dioxide Flowing Upward in a Narrow Tube
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
A12-4 Thermalhydraulics of High Prandtl-Number (Supercritical) Flows (I)

Yoonyeong Bae (Korea Atomic Energy Research Institute)
Sung Deok Hong (Korea Atomic Energy Research Institute)
Yong Wan Kim (Korea Atomic Energy Research Institute)


A reliable heat transfer correlation valid at a supercritical pressure is indispensible for an

accurate estimation of heat transfer in the sub-channel of a fuel assembly of Supercritical Water-

Cooled Reactors (SCWR). Despite a number of supercritical heat transfer correlations having

been proposed in the past several decades, a reliable one is still missing, since the predictions by

the existing correlations show wide discrepancies from each other. In a mixed convection

regime, no correlation is able to produce accurate predictions. Under the influence of strong

buoyancy, the boundary layer structure is known to deform significantly, when the wall

temperature is close to the pseudo-critical temperature; and, therefore, it is suspected to be one of

the reasons for the enhancement or impairment of the heat transfer rate. However, a detailed

analysis of the boundary-layer transformation process has never been successfully addressed, due

partially to difficulty in experimenting at a condition of high pressure and temperature, and to an

inadequacy of the numerical tools in dealing with substantial property variations. This paper

provides results of the numerical analyses of flow and thermal field in CO


flowing upward in a

narrow tube.



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