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대형 2차 와류에 의한 봉다발 부수로에서의 난류 열전달 향상에 관한 실험적 연구
서귀현(Kwi Hyun Seo),최영돈(Young Don Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Experimental studies were carried out to confirm the turbulent enhancement of the cooling system of nuclear reactor by large scale vortex generation in nuclear fuel rod bundle. The large scale vortex motions were generated by rearranging the inclination angles of mixing vanes to the coordinate directions. Experimental studies were carried out at Reynolds Number 60,000 with hydraulic condition. Normal variations of mean velocity and turbulent intensity in the rod bundle subchannel were measured by the 2-color LDV measurement system. The turbulence generated by split mixing vanes has small length scales so that they maintain only about 10DH after the spacer grid. On the other hand, the turbulences generated by the large scale vortex continue more and remain up 25DH after the spacer grid.