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추연준(Yeon-Jun Choo),장석규(Seok-Kyu Chang),김복득(Bok-Deok Kim),문상기(Sang-Ki Moon),송철화(Chul-Hwa Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The mixing vanes attached to the spacer grid of rod bundles are used to improve the heat transfer in heat exchanger devices by controlling the characteristics of the flow structures and turbulence. In this study, velocity patterns induced by two types of mixing vane(split and swirl vane) are measured by the PIV technique to better understand how to effect on the cross and secondary vortex flow patterns in 5×5 rod bundle simulating the fuel assembly of the nuclear reactor. A successful measurement of the lateral velocity patterns was conducted using a specially designed beam sheet generator and experimental loop at KAERI. As the result, we found that for the cross flow between subchannels, the split vane is more effective than the swirl vane, while for the secondary vortex flow in each subchannel, the swirl vane's one is larger and longer than split vane's one.