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동심원통속의 Coutte flow에 있어서 비 Newton 유체의 유동특성
권혁칠,이성노,부전유사 한국자동차공학회 1992 오토저널 Vol.14 No.3
The purpose of this study is to experimentally research the effects of polymer additives on turbulent transition of Couette flow between concentric cylinders when outer one is rotating and inner one is at rest; the diameter ratio being 0.2. Aqueous polymer solution generate the degradation phenomena in machine forming work, but this is not effected in about 10 minute at 5ppm. aqueous polymer solution testing. The Reynolds number, referred to the gap distance and rotation velocity of the outer cylinder, of turbulent transition is about 20000 for water flow. In the laminer region, the torque value is as same as theoretical one in the region of low Reynolds number, but becomes high with an increase in the Reynolds number. The polymer additives reduce the Reynolds number for turbulent transtition. In the turbulent region, the torque is remarkably reduced by the polymer additives, soluble polymer take down effect of turbulent transition boundary torque.
[論文] 넓은 環狀間隙을 가진 同心圓筒속의 Couette 흐름에서 高分子收容液의 流動現象
권혁칠(H. C. Kwon),이성노(S. N. Lee),부전유사(Yuji Tomita),정진도(J. D. Jung) 한국자동차공학회 1993 오토저널 Vol.15 No.3
This report describes the experimental research on the flow phenomena of the aq uaous polymer solution within the Cuette flow of the concentric, cylinders type with a wide circular gap. We have investigated the phenomena of the fluid flow through torque measuring in the system that the inner cylinder is stationary and the outer one is rotating. Geometrical parameters of the system are the gap ratio of t/R_0=0.2 and Aspect ratio of ℓ/t= 100. The torque increases considerably in about 420~480 RPM, So, it is considered a turbulent transition boundary. In that boundary, the higher plymer concentration is, the lower torque value is and the higher transition Reynolds number is. In each of the polymer concentration, the unstable boundary of torque, that is, idiosyncrasies of torque is observed around 220~280RPM. and the boundary is looked upon as a resonant vibration which is caused by the inner cylinder and tortional vibration of torque sensor.
[論文] 同心圓筒속의 Couette Flow에 있어서 非 Newton 流體의 流動特性
권혁칠(H.C.Kwon),이성노(S.N.Lee),부전유사(Yuji Tomita) 한국자동차공학회 1992 오토저널 Vol.14 No.3
The purpose of this study is to experimentally research the effects of polymer additives on turbulent transition of Couette flow between concentric cylinders when outer one is rotating and inner one is at rest; the diameter ratio being 0.2. Aqueous polymer solution generate the degradation phenomena in machine forming work, but this is not effected in about 10 minute at 5 ppm. aqueous polymer solution testing. The Reynolds number, referred to the gap distance and rotation velocity of the outer cylinder, of turbulent transition is about 20000 for water flow. In the laminer region, the torque value is as same as theoretical one in the region of low Reynolds number, but becomes high with an increase in the Reynolds number. The polymer additives reduce the Reynolds number for turbulent transtition. In the turbulent region, the torqu is remarkably reduced by the polymer additives, soluble polymer take down effect of turbulent transition boundary torque.
전재억(J. U. Jun),권혁칠(H. C. Keon),이경국(K. K. Lee),김준안(J. A. Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Place that supply of waterworks is difficult develops underground water. The underground water is stored to tank of high elevated area by pump and is supplied to each service area. In this case, problem such as pollution, energy damage, breakdown of system of tank of high elevated area happens. Such problem can solve that control water level in tank. This treatise studied simulation and layout about water level controller for small water-supply tank.