Abstract
The exchange flow may occur following the opening of a window for ventilation, as well as when a pipe ruptures in a high temperature gas-cooled nuclear reactor, 1.e., HTGR The exchange flows in density different gases were investigated through an inclined narrow flow path. The experiments were carried out in a test chamber filled with helium and the flow behavior was visualized using the smoke methods and recorded by the high-speed camera. The image of the flow was transferred to digital data, and then the slow flow velocity was measured by PIV software. Numerical analysis was carried out by the 3D code of CFD++ FEM method As the result, it was clarified that the 3D vortex mechanism and the null velocity curved surface in the exchange flow.
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