평판-평판 레오미터에서 고농축 현탁계의 벽면 No-slip 층 효과

홍영기; 최종한; 이상묵; 이재욱; Young Gi Hong; Jong Han Choi; Sangmook Lee; Jae Wook Lee

Polymer(Korea), Vol.41, No.1, 47-52, January, 2017

DOI10.7317/pk.2017.41.1.47 Export Citation

평판-평판 레오미터에서 고농축 현탁계의 벽면 No-slip 층 효과

Wall No-slip Layer Effects of Highly Concentrated Suspensions in Plate-plate Rheometer

홍영기, 최종한, 이상묵 ^{1, †}, 이재욱 ^†

서강대학교 화공생명공학과
¹단국대학교 화학공학과

Young Gi Hong, Jong Han Choi, Sangmook Lee^{1, †}, and Jae Wook Lee^†

Applied Rheology Center, Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 16890, Korea
¹Division of Chemical Engineering, Dankook University, 152 Jukjeon-Ro, Suji-gu, Yongin, Gyeonggi-do 04107, Korea

E-mail:,

초록

평판-평판 레오미터를 이용하여 Engage 8407 기지재에 Dechlorane plus 25를 60 wt% 혼합한 고농축 현탁계의 전단 점도를 연구하였다. 평판-평판간 간격을 변화시켜가며 유변학적 특성을 분석한 결과, 회전흐름 시 넓은 범위의 전단응력에서 벽면에서의 no-slip이 밝혀졌다. 또한 높은 벽면 전단응력에서 고농축 현탁계의 겉보기 전단 점도거동을 조사하였으며 no-slip 층의 두께를 결정하였다. 벽면 no-slip 효과를 이용하여 고농축 현탁계의 유변학적 특성을 보정할 수 있으리라 사료된다.

Shear viscosity of a highly concentrated suspension consisting of an Engage 8407 matrix mixed with a Dechlorane plus 25 at 60 wt% was studied by using a plate-plate rheometer. The rheological characterization at various gap distances between two plates revealed no-slip of the suspension at the walls over a broad range of shear stresses in rotational flows. The apparent shear viscosity behavior of highly concentrated suspensions at high wall shear stress was investigated, and the no-slip layer thickness was determined. It was concluded that the rheological characteristics of the highly concentrated suspensions could be corrected by no-slip effects at the walls.

Keywords:wall no-slip;highly concentrated suspensions;true viscosity;extended velocity;no-slip layer

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[Related Articles]

[1] Kamal MR, Mutel A, J. Polym. Eng., 5, 293 (1985)

[2] Metzner AB, J. Rheol., 29, 739 (1985)

[3] Khan SA, Prud’homme RK, Rev. Chem. Eng., 3, 205 (1987)

[4] Hu K, Kulkarni DD, Choi I, Tsukruk VV, Prog. Polym. Sci, 39, 1934 (2014)

[5] Bastani D, Esmaeili N, Asadollahi M, J. Ind. Eng. Chem., 19(2), 375 (2013)

[6] Lee S, Hong IK, Lee JW, Shim JS, Polym. Korea, 38(2), 225 (2014)

[7] Lee S, Hong IK, Ahn Y, Lee JW, Polym. Korea, 38(3), 272 (2014)

[8] Lee S, Hong IK, Lee JW, Lee KD, Polym. Korea, 38(3), 286 (2014)

[9] Lee S, Hong IK, Lee JW, Jeong WB, Polym. Korea, 38(4), 417 (2014)

[10] Barnes HA, Hutton JF, Walters K, An Introduction to Rheology, Elsevier, Amsterdam, 1989.

[11] Mooney M, J. Rheol., 2, 210 (1931)

[12] Cohen Y, Metzner AB, J. Rheol., 29, 67 (1985)

[13] Jiang TQ, Young AC, Metzner AB, Rheol. Acta, 25, 397 (1986)

[14] Segre G, Silberberg A, Nature, 189, 209 (1961)

[15] Segre G, Silberberg A, J. Fluid Mech., 14, 136 (1962)

[16] Seshadri V, Sutera SP, Trans. Soc. Rheol., 14, 351 (1970)

[17] Yoshimura A, Prud’homme RK, J. Rheol., 32, 53 (1988)

[18] Rabinowitsch B, Z. Physik. Chem. A, 145, 1 (1929)

[19] Cohen Y, Metzner AB, J. Rheol., 29, 67 (1985)

[20] Jiang TQ, Young AC, Metzner AB, Rheol. Acta, 25, 397 (1986)

[21] Kozicki W, Pasari SN, Rao ARK, Tiu C, Chem. Eng. Sci., 25, 41 (1970)

[22] Yilmazer U, Kalyon DM, J. Rheol., 33, 1197 (1989)

[23] Casson N, in Rheology of disperse systems, Mill CC, Editor, Pergamon Press, London, p 84 (1959).