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알루미늄의 첨가와 열처리가 연강의 응력부식성질에 미치는 영향
김신,변수일 한국부식학회 1981 Corrosion Science and Technology Vol.10 No.1
The effects of Al addition and heat treatment on the stress corrosion behaviour of mild steel (0.03∼0.04%) in the aqueous solution containing 860g Ca(NO₃)₂ 4H₂O and 30g NH₄NO₃ per liter of solution was studied at the boiling temperature (11℃) using constant strain method (U-bend specimen). The resistance to SCC (stress corrosion cracking) of mild steel was studied with various Al contents of 0%, 0.04%, 0.45%, 0.65%, 0.96%, 1.28% and 1.52% by weight after annealing at 1150℃ for 1h, then furnace-cooled to room temperature. The effect of heat treatments (furnace-cooled, oil-quenched, water-quenched, and water-quenched then tempered at 500f7 for 1h) m the resistance to SCC was studied with the specimens of 0.04% and 0.45% Al content. Induction period, crack propagation period and rate were determined by extrapolation of measured maximum crack depth at different exposure time to the corrosive environment. In this study incluction period and crack propagation rate are considered to be toe measure of resistance to SCC of mild steel. All specimens showed 1 or up to 3 crack on an U-bend specimen which propagated along grain boundary (intercrystalline SCC). For furnace-cooled specimens the resistance to SCC increased as Al content increased from 0% up to 0.65%, then decreased up to 1.52% Al. The two staged variation of the resistance to SCC in mild steel was discussed in terms of tendency of Al nitride formation and grain size of specimens respectively. Tempered specimens with Al contents 0.04% and 0.45% skewed higher resistance to SCC than water-quenched and this is considered to be due to the decrease in carbon concentration at the grain boundary.
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봉다발 온도장 해석을 위한 난류 Prandtl 수 모델 개발
김신,현명택 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.1
The turbulent Prandtl number is a useful concept for engineering calculations. However, most turbulent Prandtl number models are developed for simple geometries like circular tube and parallel plates and these seem to be inadequate for rod bundles like nuclear subchannels. In this study, based on some recent measurements of turbulent Prandtl numbers in rod bundles and general behaviors of the dimensionless number, a turbulent Prandtl number model for rod bundles is proposed. Also, thermal hydraulic fields in rod bundles are numerically predicted with the proposed model and the average Nuseelt numbers are successfully compared with well-known empirical correlations.
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중소형 일체형원자로에 사용되는 자기가압기 크기결정 및 성능해석
김신 濟州大學校 工科大學 産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.1
Many small integral reactors adopt self-pressurizers which do not use heaters nor sprays for passive operation. In this study, working mechanisms of steam-, mixture-, and nitrogen-type self-pressurizers are compared and the sizes of the primary systems that can accomodate the operating conditions are determined for each types of self-pressurizer. Also, the reactor coolant system conditions after thermal load transients are calculated and the performances of each type self-pressurizers are analyzed.
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대류가 우세한 상변화 문제 해석을 위한 고정격자 유한체적법
김신,김민찬,이상백 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.2
A fixed-grid finite volume numerical approach is developed to simulate physical details of convection-dominated phase change problems. This approach adopts the enthalpy-porosity method associated with new algorithms that is devised to track the phase front efficiently. A comparative analysis with transformed- and fixed-grid approaches is performd to demonstrate the predictability of the presented model. Results of a melting and solidification experiments are used to assess and evaluate the performance of the model.
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