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