scholarly journals Numerical Analysis of Deterioration in Heat Transfer to Supercritical Water.

1994 ◽  
Vol 60 (575) ◽  
pp. 2497-2503 ◽  
Author(s):  
Seiichi Koshizuka ◽  
Naoki Takano ◽  
Yoshiaki Oka
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Supercritical Water

Numerical Analysis of Thermal-Hydraulic Behavior of Supercritical Water in Vertical Upward/Downward Flow Channels

2008 ◽  
Author(s):  
Hanyang Gu ◽  
Xu Cheng ◽  
Xiaojing Liu
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Supercritical Water ◽  
Square Lattice ◽  
Bulk Temperature ◽  
Upward Flow ◽  
Downward Flow ◽  
Hydraulic Behavior ◽  
Hydraulic Behaviour ◽  
Turbulence Mixing

Investigations on the thermal-hydraulic behavior in the SCWR fuel assembly have obtained a significant attention in the international SCWR community. However, there is still a lack of understanding and ability to predict the heat transfer behavior of supercritical fluids. In this paper, the numerical analysis is carried out to study the thermal-hydraulic behaviour in vertical sub-channels cooled by supercritical water. Remarkable differences in characteristics of secondary flow are found, especially in square lattice, between the upward flow and downward flow. The turbulence mixing across sub-channel gap for downward flow is much stronger than that for upward flow in wide lattice when the bulk temperature is lower than pseudo-critical point temperature. For downward flow, heat transfer deterioration phenomenon is suppressed with respect to the case of upward flow at the same conditions.

Heat Transfer to Sub- and Supercritical Water Flowing Upward in a Vertical Tube at Low Mass Fluxes: Numerical Analysis and Experimental Validation

2016 ◽  
Vol 55 (51) ◽  
pp. 13120-13131 ◽  
Author(s):  
Samuel O. Odu ◽  
Pelle Koster ◽  
Aloijsius G. J. van der Ham ◽  
Martin A. van der Hoef ◽  
Sascha R. A. Kersten
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Supercritical Water ◽  
Experimental Validation ◽  
Vertical Tube ◽  
Mass Fluxes ◽  
Low Mass
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