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김재근(J.G.Kim),이민호(M.H.Lee),유병구(B.G.You),양희준(H.J.Yong),차경옥(K.O.Cha) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Drag reduction in polymer solutions is the phenomenon where by extremely dilute solutions of high molecular weight polymers exhibit frictional resistance to flow much lower than the pure solvent This effect, largely unexplained as yet, has attracted the attention of polymer scientists and fluid flow specialists. Although applications are beginning to appear, the principle interest to data has been in attempting to relate the effect to the fluid mechanics of turbulent flow. Also we want to is to evaluate the drag reduction in horizontal flow by measuring pressure drop, mean liquid velocity, and turbulent intensity. Polyacylamide and co-polymer are used for various polymer conditions. Experimental results show higher drag reduction using co-polymer then using polyacrylamide and faster degradation using polyacrylamide than using co-polymer under the same Reynolds number. Mean velocities increase as adding more polymer, and turbulent intensities decrease as the distance for the wall in inversed.<br/>