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김경태(K.T. Kim),김은수(E.S. Kim),조성록(S.R. Cho),정경호(K.H. Chung),박준건(J.K. Park),강병석(B.S. Kang),서현석(H.S. Seo) 한국해양환경·에너지학회 2004 한국해양환경공학회 학술대회논문집 Vol.2004 No.-
Dissolved heavy metals in surface waters of the Saemangeum area observed relatively high temporal and spatial variations. High concentrations of some metals except for Cd were found in the sampling sites of Mankyoung river estuary and inner parts of Saemangeum area. Due to desorption from Cd from suspended solids in saline water, dissolved Cd concentrations were high in the high salinity zone and low in the low salinity. Almost dissolved and particulate metal concentrations of this study were similar to the previous data in this area. However, the average contents of particulate Ni and Cd were two and five times higher than those in the previous data, respectively. In November, the DM/TM ratios were low due to relatively high SS concentrations. The average DM/TM except for DM/TM ratio in November were to the order of Cd(89.2%)>Cu(80.3%)>Ni(76.0%)>Co(47.2%)>Zn(30.6%)>Pb(23.2%).
분사 홀 피치비 변화가 이중분사 막냉각 홀 주위 열유동에 미치는 영향
조문영(M.-Y. Cho),서현석(H.-S. Seo),김윤제(Y.-J. Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this study, the film cooling characteristics and the effectiveness of the double-jet film cooling hole were numerically investigated. In particular, thermal-flow characteristics in the vicinity of the double-jet film cooling hole are investigated with various ratios of pitch distance, hole diameter(P/d=4, 5, 6) and blowing ratios(M=1.0, 1.5, 2.0). Numerical study was performed by using ANSYS CFX with the shear stress transport(SST) turbulence model. The film cooling effectiveness and temperature distribution were graphically depicted with various flow and geometrical conditions.