Numerical analysis of laminar free convection in square cavity containing heat generating Kr-85 gas.
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概要
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A laminar free convection of heat generating fluid in a horizontal square container with 10 cm × 10 cm cross section and infinite length was analyzed through the Newton iterative numerical solution of the equations of change without the Boussinesq approximation. Computations were performed for Kr gas in the case of charging pressure of 0.216, 0.540 and 1.081 MPa at 295 K. As the Newton iterating procedure requires initial values not far away from the true solution, the solution of slightly lower percentage of <SUP>85</SUP>Kr was used for the initial values. The percentage of <SUP>85</SUP>Kr (and, hence heat generating rate) was thus increased gradually untill the concentration of <SUP>85</SUP>Kr was so high (13% at 0.216 MPa) that convergent solution could not be obtained. With increasing the concentration of <SUP>85</SUP>Kr, flow pattern is changed from "ordinary" free convection like one generated when heated from below to a complexed pattern with several vortices in the upper part of the container. Similarity of flow fields was shown among various sets of charging pressure and concentration of <SUP>85</SUP>Kr. Reason of an onset of the vortical flows was also discussed based on the temperature distribution within the cavity.
- 一般社団法人 日本原子力学会の論文
著者
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Kanagawa Akira
Department Of Nuclear Engineering Faculty Of Engineering Nagoya University
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Yamamoto Ichiro
Department Of Chemistry Graduate School Of Science The University Of Tokyo
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YAMASHITA Tadahiko
Department of Nuclear Engineering, Faculty of Engineering, Nagoya University
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