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혼합날개가 부착된 6×6 봉다발 부수로에서의 열전달 향상을 위한 실험적 연구
변선준,신용철,민경호,방윤곤,채영종 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2
The present experimental study investigates single-phase heat transfer coefficients downstream of support grid in 6×6 rod bundles. Support grid with Split mixing vanes enhance heat transfer in rod bundles by generating turbulence but this turbulence is confined to a short distance. Support grid with large scale vortex flow(LSVF) mixing vanes enhanced heat transfer to a longer distance. In this study, the experiments were performed at reynolds numbers of 50,000. The characteristics of the heat transfer enhancement of the Split mixing vane and those of the LSVF mixing vane were compared. The results showed that the characteristics of the heat transfer enhancement of rods by the Split mixing vane were limited to 10 Dh after the spacer grid, but those by the LSVF mixing vane were maintained until 15 Dh after the spacer grid. For the reynolds number of 50,000, the heat transfer enhancement effect was 3.0% greater when using the LSVF mixing vane than when using the Split mixing vane between the 1 ∼ 15 Dh interval after the spacer grid.
혼합날개가 부착된 6×6 봉다발 부수로에서의 열전달 향상을 위한 실험적 연구
변선준,신용철,민경호,방윤곤,채영종 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2
The present experimental study investigates single-phase heat transfer coefficients downstream of support grid in 6×6 rod bundles. Support grid with Split mixing vanes enhance heat transfer in rod bundles by generating turbulence but this turbulence is confined to a short distance. Support grid with large scale vortex flow(LSVF) mixing vanes enhanced heat transfer to a longer distance. In this study, the experiments were performed at reynolds numbers of 50,000. The characteristics of the heat transfer enhancement of the Split mixing vane and those of the LSVF mixing vane were compared. The results showed that the characteristics of the heat transfer enhancement of rods by the Split mixing vane were limited to 10 Dh after the spacer grid, but those by the LSVF mixing vane were maintained until 15 Dh after the spacer grid. For the reynolds number of 50,000, the heat transfer enhancement effect was 3.0% greater when using the LSVF mixing vane than when using the Split mixing vane between the 1 ∼ 15 Dh interval after the spacer grid.
전병국,윤은구,배황,양진화,류성욱,방윤곤,이성재,박현식 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
A two-phase natural circulation test using SMART integral test loop (SMARTeITL) was conducted toexplore thermo-hydraulic phenomena of two-phase natural circulation in the SMART reactor. Specifically,the test examined the natural circulation in the primary loop under a stepwise coolant inventoryloss while keeping the core power constant at 5% of the scaled full power. Based on the test results, threeflow regimes were observed: single-phase natural circulation (SPNC), two-phase natural circulation(TPNC), and boilerecondenser natural circulation (BCNC). The flow rate remained steady in the SPNC,slightly increased in the TPNC, and dropped abruptly and maintained in the BCNC. Using a natural circulationflow map, the natural circulation characteristic in the SMARTeITL was compared with those inpressurized water reactor simulators. In the SMARTeITL, a BCNC regime appeared instead of siphoncondensation and reflux condensation regimes because of the use of once-through steam generators. © 2021 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under th