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두 개의 분지관을 가진 직사각형 덕트 내의 유량배분에 관한 실험 및 수치계산 연구
윤영환,배택희,박원구 대한설비공학회 2002 설비공학 논문집 Vol.14 No.9
Flow distributions in a rectangular duct with two branch ducts are measured by 5 W laser doppler velocity meter. The fluid flows are also computed by commercial soft-ware of STAR-CD for comparison between them. The Reynolds numbers in the main duct are from 4,226 to 17,491. The ratios distributed into two branches from the main duct are in-variant to Reynolds numbers according to both of numerical and experimental results. However computed velocity profiles at exit of each branch are somewhat different from measured profiles at the same location.
직각 엘보우를 가진 사각닥트내의 유체흐름에 관한 삼차원 수치 계산
윤영환,배택희,박원구 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-
Three dimensional fluid flow is computed in a rectangular duct with 90˚ wintered elbow by Finite Volume numerical method. The Reynolds number of the fluid flow is 12,186 based on mean velocity and hydraulic diameter of the duct, and the standard K-ε turbulent model is adopted for prediction of turbulent viscosity. The numerical results are compared with experimental data measured by laser doppler velocity meter. The distributions of fluid flow at middle and exit sections past the 90˚ elbow are compared with the experiment data at the same cross sections by taking the measured data at inlet as the inlet boundary conditions of numerical computation. The computed velocity components made relatively good simulation to the experimental data. But, in particular locations, the quantitative agreement between them is less satisfactory. Furthermore, it is also shown that turbulent kinetic energy has similar tendency with turbulent fluctuation components measured by experimental test.
윤영환,배택희,박원구 한국마린엔지니어링학회 2002 한국마린엔지니어링학회지 Vol.26 No.6
Fluid flow in a rectangular duct with $90^{\circ}$ mitered elbow is measured by 5W laser doppler velocity meter. The fluid flow is also computed by commercial software of STAR-CD for comparison between measured and computed velocity profiles in the duct. Reynolds numbers for the comparison are 1,608 and 11,751 based on mean velocity and hydraulic diameter of the duct. First, the fluid flow of Reynolds number equal to 1,608 is predicted by assumptions of both laminar and turbulent models. But, even though the Reynolds number is less than 2,300~3,000, the computation by turbulent model is closed to the experimental data than that by laminar model. Second, the computation for Reynolds number of 11,751 by turbulent model also predicted the experimental data satisfactorily.