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macromolecular solutions under Poiseuille flow in microchannels are investigated using the dissipative particle dynamics (DPD) approach. The results show that the macromolecular solutions are non-Newtonian fluids which can be described by power-law fluids, and the power-law index decreases with the increase of the macromolecular concentration. The DPD simulations show that the hydrodynamic interaction between the macromolecular chains and the wall, and the gradient of Brownian diffusivity of the chains govern the cross-stream migration of the macromolecules. However, the chain-wall hydrodynamic interaction may not be fully developed and are partly screened in conventional DPD approach. Hence, the chains migrate toward the wall during flow. Simulation results also indicate that the migration toward the wall increases with the increase of the driving force. The competition between the unscreened chain-wall hydrodynamic interaction and Brownian diffusivity leads to two symmetric off-center peaks and a local minimum in the channel centerline in the chain center-of-mass distribution. Under strong confinement, the chain-wall hydrodynamic interaction may be fully screened and the Brownian motion is weak, thus the chains weakly move toward the wall for channel of small width.
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Keywords:
- dissipative particle dynamics /
- macromolecular solutions /
- non-Newtonian fluids /
- cross-stream migration
[1] Graham M D 2011 Annu. Rev. Fluid Mech. 43 273
[2] Jiang S C, Zhang L X, Xia A G, Chen H P 2010 Acta Phys. Sin. 59 4337(in Chinese) [江绍钏, 章林溪, 夏阿根, 陈宏平 2010 59 4337]
[3] Reisner W, Morton K J, Riehn R, Wang Y M, Yu Z N, Rosen M, Sturm J C, Chou S Y, Frey E, Austin R H 2005 Phys. Rev. Lett. 94 196101
[4] Pryor H I, Vacanti J P 2008 Front. Biosci. 13 2140
[5] Muthukumar M 2001 Phys. Rev. Lett. 86 3188
[6] Perkins T T, Simth D E, Larson R G, Chu S 1995 Science 268 83
[7] Zheng J J, Yeung E S 2002 Anal. Chem. 74 4536
[8] Zheng J J, Yeung E S 2003 Anal. Chem. 75 3675
[9] Fang L, Hu H, Larson R G 2005 J. Rhel. 49 127
[10] Chen Y L, Graham M D, de Pablo J J, Jo K, Schwartz D C 2005 Macromolecules 38 6680
[11] Metzner A B, Cohen Y, Rangel-Nafaile C 1979 J. Non-Newtonian Fluid Mech. 5 449
[12] Agarwall U S, Dutta A, Mashelkar R A 1994 Chem. Eng. Sci. 49 1693
[13] Ma H, Graham M 2005 Phys. Fluids 17 083103
[14] Brunn P O 1985 J. Chem. Sci. Polym. Phys. 23 89
[15] Jendrejack R M, Schwartz D C, de Pablo J J, Graham M D 2004 J. Chem. Phys. 120 2513
[16] Jendrejack R M, Schwartz D C, Graham M D, de Pablo J J 2003 J. Chem. Phys. 119 1165
[17] Jendrejack R M, Dimalanta E T, Schwartz D C, Graham M D, de Pablo J J 2003 Phys. Rev. Lett. 91 038102
[18] Jendrejack R M, de Pablo J J, Graham M D 2002 J. Chem. Phys. 116 7752
[19] Usta O B, Butler J E, Ladd A J C 2006 Phys. Fluids 18 031703
[20] Usta O B, Ladd A J C, Butler J E 2005 J. Chem. Phys. 122 094902
[21] Khare R, Graham M D, de Pablo J J 2006 Phys. Rev. Lett. 96 224505
[22] Fan X J, Phan-Thien N, Yong N T, Wu X H, Xu D 2003 Phys. Fluids 15 11
[23] Fedosov D A, Karniadakis G E, Caswell B 2008 J. Chem. Phys. 128 144903
[24] Millan J A, Jiang W H, Laradji M, Wang Y M 2007 J. Chem. Phys. 126 124905
[25] Tong H P, Zhang L X 2012 Acta Phys. Sin. 61 058701 (in Chinese) [仝焕平, 章林溪 2012 61 058701]
[26] Segre G, Silberberg A 1961 Nature 189 209
[27] Espanol P, Warren P B 1995 Europhys. Lett. 30 191
[28] Groot R D, Warren P B 1997 J. Chem. Phys. 107 4423
[29] Duong-Hong D, Phan-Thien N, Fan X J 2004 Comput. Mech. 35 24
[30] Rapaport D C 2004 The Art of Molecular Dynamics Simulation (Cambridge, UK: Cambridge University Press) pp49-60
[31] Zhou L W, Liu M B, Chang J Z 2012 Acta Polymerica Sinica 7 720 (in Chinese) [周吕文, 刘谋斌, 常建忠 2012 高分子学报 7 720]
[32] Fan X J, Phan-Thien N, Chen S, Wu X H, Yong N T 2006 Phys. Fluids 18 063102
[33] Jiang W H, Huang J H, Wang Y M, Laradji M 2007 J. Chem. Phys. 126 044901
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[1] Graham M D 2011 Annu. Rev. Fluid Mech. 43 273
[2] Jiang S C, Zhang L X, Xia A G, Chen H P 2010 Acta Phys. Sin. 59 4337(in Chinese) [江绍钏, 章林溪, 夏阿根, 陈宏平 2010 59 4337]
[3] Reisner W, Morton K J, Riehn R, Wang Y M, Yu Z N, Rosen M, Sturm J C, Chou S Y, Frey E, Austin R H 2005 Phys. Rev. Lett. 94 196101
[4] Pryor H I, Vacanti J P 2008 Front. Biosci. 13 2140
[5] Muthukumar M 2001 Phys. Rev. Lett. 86 3188
[6] Perkins T T, Simth D E, Larson R G, Chu S 1995 Science 268 83
[7] Zheng J J, Yeung E S 2002 Anal. Chem. 74 4536
[8] Zheng J J, Yeung E S 2003 Anal. Chem. 75 3675
[9] Fang L, Hu H, Larson R G 2005 J. Rhel. 49 127
[10] Chen Y L, Graham M D, de Pablo J J, Jo K, Schwartz D C 2005 Macromolecules 38 6680
[11] Metzner A B, Cohen Y, Rangel-Nafaile C 1979 J. Non-Newtonian Fluid Mech. 5 449
[12] Agarwall U S, Dutta A, Mashelkar R A 1994 Chem. Eng. Sci. 49 1693
[13] Ma H, Graham M 2005 Phys. Fluids 17 083103
[14] Brunn P O 1985 J. Chem. Sci. Polym. Phys. 23 89
[15] Jendrejack R M, Schwartz D C, de Pablo J J, Graham M D 2004 J. Chem. Phys. 120 2513
[16] Jendrejack R M, Schwartz D C, Graham M D, de Pablo J J 2003 J. Chem. Phys. 119 1165
[17] Jendrejack R M, Dimalanta E T, Schwartz D C, Graham M D, de Pablo J J 2003 Phys. Rev. Lett. 91 038102
[18] Jendrejack R M, de Pablo J J, Graham M D 2002 J. Chem. Phys. 116 7752
[19] Usta O B, Butler J E, Ladd A J C 2006 Phys. Fluids 18 031703
[20] Usta O B, Ladd A J C, Butler J E 2005 J. Chem. Phys. 122 094902
[21] Khare R, Graham M D, de Pablo J J 2006 Phys. Rev. Lett. 96 224505
[22] Fan X J, Phan-Thien N, Yong N T, Wu X H, Xu D 2003 Phys. Fluids 15 11
[23] Fedosov D A, Karniadakis G E, Caswell B 2008 J. Chem. Phys. 128 144903
[24] Millan J A, Jiang W H, Laradji M, Wang Y M 2007 J. Chem. Phys. 126 124905
[25] Tong H P, Zhang L X 2012 Acta Phys. Sin. 61 058701 (in Chinese) [仝焕平, 章林溪 2012 61 058701]
[26] Segre G, Silberberg A 1961 Nature 189 209
[27] Espanol P, Warren P B 1995 Europhys. Lett. 30 191
[28] Groot R D, Warren P B 1997 J. Chem. Phys. 107 4423
[29] Duong-Hong D, Phan-Thien N, Fan X J 2004 Comput. Mech. 35 24
[30] Rapaport D C 2004 The Art of Molecular Dynamics Simulation (Cambridge, UK: Cambridge University Press) pp49-60
[31] Zhou L W, Liu M B, Chang J Z 2012 Acta Polymerica Sinica 7 720 (in Chinese) [周吕文, 刘谋斌, 常建忠 2012 高分子学报 7 720]
[32] Fan X J, Phan-Thien N, Chen S, Wu X H, Yong N T 2006 Phys. Fluids 18 063102
[33] Jiang W H, Huang J H, Wang Y M, Laradji M 2007 J. Chem. Phys. 126 044901
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