caa a22 4500 469126485 CHVBK 20180323133152.0 cr unu---uuuuu 170328e19921001xx s 000 0 eng 10.1007/BF02705291 doi (NATIONALLICENCE)springer-10.1007/BF02705291 Analysis on the apparent slip and depleted layer of polymer flow in narrow-bore capillaries [Elektronische Daten] [Cheon-Il Park, Myung-Suk Chun, Dong-Hak Kim, O. Park] Polymer solutions flowing through small-diameter capillaries of which length scale is much larger than that of polymers were experimentally demonstrated to have the enhanced flow rate as compared to in bulk flow. Thisapparent slip phenomenon was analyzed by obtaining theslip velocity and concentrationdepleted layer thickness. Hydrolyzed polyacrylamide (HPAM) of highly flexible polymer and Xanthan of rigid rodlike polymer were made to flow through stainless steel capillaries having the diameter range of about 100 to 250 μm. The results showed that both slip velocity and depleted layer thickness decreased markedly with increasing polymer concentration. This behavior can be interpreted as being due to the reduction of diffusion coefficient and flexibility of polymer chains as the concentration is increased. The depleted layer thickness of HPAM was much larger than the polymeric length scale and was shown to increase with increasing wall shear stress. This is considered as an evidence of thestress-induced diffusion of polymer chains being a dominant factor for the apparent slip of flexible polymer solution. On the other hand, the depleted layer thickness of Xanthan solution was almost constant with the wall shear stress, which can not be explained by the stress-induced diffusion mechanism alone. Korean Institute of Chemical Engineering, 1992 Park Cheon-Il Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut Chun Myung-Suk Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut Kim Dong-Hak Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut Park O. Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut Korean Journal of Chemical Engineering Springer-Verlag 9/4(1992-10-01), 186-193 0256-1115 9:4<186 1992 9 11814 https://doi.org/10.1007/BF02705291 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02705291 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Park Cheon-Il Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut NATIONALLICENCE 700 1- Chun Myung-Suk Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut NATIONALLICENCE 700 1- Kim Dong-Hak Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut NATIONALLICENCE 700 1- Park O. Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1, Kusong-Dong, Yusung-Ku, 305-701, Taejon, Korea aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer-Verlag 9/4(1992-10-01), 186-193 0256-1115 9:4<186 1992 9 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer