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입자영상유속계와 컴퓨터 시뮬레이션을 이용한 분기관내 유동해석
서상호,최을,노형운,도덕희,Sub, Sang-Ho,Choi, Yul,Roh, Hyung-Woon,Doh, Deog-Hee 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.1
The objective of the current study is to understand steady 3-dimensional flow phenomena in a bifurcated duct experimentally. A bifurcation model is fabricated with transparent acrylic resin to visualize the whole flow field with the PIV system. The gray level cross-correlation method is applied to the image processing algorithm. The subpixel and the area interpolation methods are used to obtain the final velocity vectors. The finite volume predictions are used to analyze the flow patterns in the bifurcation model. The results of the computer simulation and the PIV experiment for three-dimensional flow show the recirculation zone and the formation of the paired secondary flow distal to the apex of the bifurcation model. The results obtained with the two methods also show that the branch flow strongly strikes the inner wall due to the inertial effect and accompanied helical motion as it flows toward the outer wall.
진희남(Hee-Nam Jin),변종윤(Jong-Youn Byun),서상호(Sang-Ho Sub),노형운(Hyung-Woon Roh) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Sedimentation phenomenon of suspended solids occurs by the gravitational force. Pollution particles are separated from slowly flowing wastewater in clarifier. Recently, the sludge suction collector is preferred rather than the scraper type sludge collector due to enhancement of the clarifier efficiency. The sludge suction collector is usually operated by the user's experiences without any scientific and/or technical consideration. To evaluate the performance. of sludge suction collector, the three dimensional computer simulation was conducted by the finite volume method. To analyze the performance, the velocity vectors and the suction flow rates of the orifices were investigated. The result showed that each suction flow rate through out the collector was equivalent in the sludge suction collector and the efficiency of suction collector was good to remove high concentrated sludge in clarifier.