Quench sensitivity to defects and shear banding in nematic polymer film flows

Journal of Non-Newtonian Fluid Mechanics

Volumn 159, Issue 1-3, 2009, Pages 115-129

  Yang, Xiaofeng ^a   Forest, M Gregory ^a   Mullins, William ^a   Wang, Qi ^b  

^a UNIVERSITY OF NORTH CAROLINA   (United States)

^b UNIVERSITY OF SOUTH CAROLINA   (United States)

Author keywords

Nematic polymers; Shear flows; Thermal quench

Indexed keywords

DEFECT LAYERS; DRIVING CONDITIONS; DYNAMIC RANGES; EFFECTIVE CONDUCTIVITIES; EFFECTIVE PROPERTIES; ELECTRICAL CONDUCTIVITIES; ENHANCED CONDUCTIVITIES; FILM FLOWS; FILM PERFORMANCE; FLOW REVERSALS; FLOW-INDUCED ANISOTROPIES; GRADIENT ELASTICITIES; IN-PHASE; ISOTHERMAL SHEARS; LIQUID-CRYSTALLINE; LIQUID-CRYSTALLINE POLYMERS; MATRIX COMPOSITES; MOLAR MASS LIQUID CRYSTALS; MONODOMAINS; MULTI-SCALE MODELS; NEMATIC POLYMERS; NON UNIFORMITIES; NON-NEWTONIAN FLUIDS; NORMAL STRESS; PARALLEL PLATES; PLATE MOTIONS; PROCESSING CONDITIONS; PULSATING JETS; QUENCH SENSITIVITIES; SHEAR BANDING; SOLID FILMS; THERMAL QUENCH; THERMO MECHANICALS; THERMO-MECHANICAL EFFECTS;

ANISOTROPY; CARBON FIBER REINFORCED PLASTICS; COMPOSITE FILMS; CONDUCTING POLYMERS; CRYSTALLINE MATERIALS; DEFECTS; ELECTRIC CONDUCTIVITY; FLUID DYNAMICS; LIGHT SOURCES; LIQUID CRYSTAL POLYMERS; LIQUID CRYSTALS; LIQUIDS; METALLIC MATRIX COMPOSITES; NANOCOMPOSITES; NANORODS; PLASMAS; PLASTIC FILMS; POLYMER FILMS; POLYMER MATRIX COMPOSITES; POLYMERS; SHEAR BANDS; SHEAR FLOW; SINGLE CRYSTALS; SOLVENTS; TENSORS; THERMOMECHANICAL TREATMENT;

NEMATIC LIQUID CRYSTALS;

EID: 64549100248     PISSN: 03770257     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jnnfm.2009.02.005     Document Type: Article

References (46)

1. Akopyan R.S., Alaverdian R.B., Santrosian E.A., and Chilingarian Y.S. Thermomechanical effects in the nematic liquid crystals. J. Appl. Phys. 90 (2001) 3371-3376
2. Bhave A.V., Menon R.K., Armstrong R.C., and Brown R.A. A constitutive equation for liquid-crystalline polymer solutions. J. Rheol. 37 (1993) 413-442
3. Choate E., and Forest M.G. A classical problem revisited: rheology of nematic polymer monodomains in small amplitude oscillatory shear. Rheol. Acta 46 1 (2006) 83-94
4. Choate E., Cui Z., and Forest M.G. Effects of strong anchoring on the dynamic moduli of heterogeneous nematic polymers. Rheol. Acta 47 2 (2008) 223-236
5. Dubois-Violette E., Guyon E., and Pieranski P. Heat convection in a nematic liquid crystal. Mol. Cryst. Liquid Cryst. 26 (1974) 193-212
6. Forest M.G., Wang Q., and Bechtel S. One-dimensional isothermal spinning models for liquid crystalline polymer fibers. J. Rheol. 41 4 (1997) 821-850
7. Forest M.G., Zhou H., and Wang Q. A model study of the spinning of thermotropic liquid crystalline polymers: fiber performance predictions and bounds on throughput. Adv. Polym. Technol. 18 4 (1999) 314-335
8. Forest M.G., Zhou H., and Wang Q. Thermotropic liquid crystalline polymer fibers. SIAM J. Appl. Math. 4 (2000) 1177-1204
9. Forest M.G., Wang Q., Zhou H., and Zhou R. Structure scaling properties of confined nematic polymers in plane Couette cells: the weak flow limit. J. Rheol. 48 1 (2004) 175-192
10. Forest M.G., Wang Q., and Zhou R. Scaling behavior of kinetic orientational distributions for dilute nematic polymers in weak shear. J. Non-Newtonian Fluid Mech. 116 2-3 (2004) 183-204
11. Forest M.G., Zhou R., and Wang Q. Nano-rod suspension flows: a 2D Smoluchowski-Navier-Stokes solver. Int. J. Numer. Anal. Model. 4 3 (2007) 478-488
12. Forest M.G., Zhou R., and Wang Q. Microscopic-macroscopic simulations of rigid-rod polymer hydrodynamics: heterogeneity and rheochaos. SIAM Multiscale Model. Simul. 6 3 (2007) 858-878
13. Grecov D., and Rey A.D. Shear-induced textural transitions in flow-aligning liquid crystal polymers. Phys. Rev. E 68 (2003) 061704
14. Grecov D., and Rey A.D. Impact of textures on stress growth of thermotropic liquid crystals subjected to shear step-up. Rheol. Acta. 44 2 (2004) 135-149
15. Grecov D., and Rey A.D. Texture control strategies for flow-aligning liquid crystal polymers. J. Non-Newtonian Fluid Mech. 139 (2006) 197C208
16. Han W.H., and Rey A.D. Simulation and validation of temperature effects on the nematorheology of aligning and nonaligning liquid crystals. J. Rheol. 39 2 (1995) 301-322
17. Hakobyan R.S., Yesayan G.L., and Zeldovich B.Y. Thermomechanical oscillations in hybrid nematic liquid crystals. Phys. Rev. E 73 (2006) 061707
18. M.G. Forest, S. Heidenreich, S. Hess, X. Yang, R. Zhou, Robustness of pulsating jet-like layers in sheared nano-rod dispersions, J. Non-Newtonian Fluid Mech. 155 (2008) 130-145.
19. Klein D.H., Garcia-Cervera C.J., Ceniceros H.D., and Leal L.G. Ericksen number and Deborah number cascade predictions of a model for liquid crystalline polymers for simple shear flow. Phys. Fluids 19 2 (2007) 023101-1-02310119-02310119
20. Klein D.H., Garca-Cervera C.J., Ceniceros H.D., and Leal L.G. Three-dimensional shear driven dynamics of polydomain textures and disclination loops in liquid crystalline polymers. J. Rheol. 52 (2008) 837-863
21. Lavrentovich O.D., and Nastishin Y.A. Thermomechanical effect in deformed nematic liquid crystal. Ukrainian Fiz. Zhurn. 32 (1987) 710-712
22. Marrucci G., and Greco F. The elastic constants of MaierCSaupe Rodlike molecule nematics. Mol. Cryst. Liq. Cryst. 206 (1991) 17-30
23. Marrucci G., and Greco F. Flow behavior of liquid crystalline polymers. Adv. Chem. Phys. 86 (1993) 331-404
24. Rey A.D. Fiber stability analysis of liquid crystal in-situ composites. Polym. Compos. 18 (1997) 687-691
25. Rey A.D. Thermodynamic stability analysis of liquid crystalline polymer fibers. Ind. Eng. Chem. Res. 36 (1997) 1114-1121
26. Rey A.D. Analysis of liquid crystalline fiber coatings. Mol. Cryst. Liquid Cryst. 333 (1999) 15-23
27. Rey A.D., and Denn M.M. Dynamical phenomena in liquid-crystalline materials. Annu. Rev. Fluid Mech. 34 (2002) 233-266
28. Rey A.D., Grecov D., and Lima L. Multiscale simulation of flow-induced texture formation in polymer liquid crystals and carbonaceous mesophases. J. Mol. Simul. 31 2-3 (2005) 185-199
29. Rey A.D. Capillary models for liquid crystal fibers, membranes, films, and drops. Soft Matter 2 (2007) 1349-1368
30. Singh A.P., and Rey A.D. Consistency of predicted shear-induced orientation modes with observed mesophase pitch-based carbon fiber texture. Carbon 36 12 (1998) 1855-1859
31. Sgalari G., Leal L.G., and Feng J.J. The flow behavior of LCPs based on a generalized Doi model with distortional elasticity. J. Non-Newtonian Fluid Mech. 102 (2002) 361-382
32. Sgalari G., Leal L.G., and Meiburg E. Texture evolution of sheared LCPs: numerical predicitons of roll-cells instability director turbulence and striped texture with the molecular model. J. Rheol. 47 (2003) 1417-1444
33. Tsuji T., and Rey A.D. Effect of long range order on sheared liquid crystalline materials, Part I: compatability between tumbiling and behavior and fixed anchoring. J. Non-Newtonian Fluid Mech. 73 (1997) 127-152
34. Tsuji T., and Rey A.D. Orientational mode selection mechanisms for sheared nematic liquid crystalline materials. Phys. Rev. E 57 (1998) 5609-5625
35. Tsuji T., and Rey A.D. Effect of long range order on sheared liquid crystalline materials: Flow regimes, transitions, and rheological diagrams. Phys. Rev. E 62 (2000) 8141-8151
36. Tao J., and Feng J.J. Effects of elastic anisotropy on the flow and orientation of sheared nematic liquid crystals. J. Rheol. 47 (2003) 1051-1070
37. Zhou R., Forest M.G., and Wang Q. Kinetic structure simulations of nematic polymers in plane Couette cells, I: the algorithm and benchmarks. SIAM Multiscale Model. Simul. 3 4 (2005) 853-870
38. Zhou H., Zheng X., Forest M.G., Wang Q., and Lipton R. Extension-enhanced conductivity of liquid crystalline polymer nano-composites. Macromol. Symp. 28 (2005) 81-85
39. Zhou H., and Forest M.G. Anchoring distortions coupled with plane Couette & Poiseuille flows of nematic polymers in viscous solvents: morphology in molecular orientation, stress and flow. Discrete Cont. Dyn. Syst. 6 (2006) 407-425
40. Zhou H., Forest M.G., and Wang Q. Anchoring-induced structure transitions of flowing nematic polymers in plane Couette cells. Discrete Cont. Dyn. Syst. B 8 3 (2007) 707-733
41. Zheng X., Forest M.G., Lipton R., Zhou R., and Wang Q. Exact scaling laws for electrical conductivity properties of nematic polymer nano-composite monodomains. Adv. Funct. Mater. 15 4 (2005) 627-638
42. Zheng X., Forest M.G., Zhou R., Wang Q., and Lipton R. Anisotropy and dynamic ranges in effective properties of sheared nematic polymer nano-composites. Adv. Funct. Mater. 15 (2005) 2029-2035
43. Zheng X., Forest M.G., Lipton R., and Zhou R. Nematic polymer mechanics: flow-induced anisotropy. Contin. Mech. Thermodyn. 18 (2007) 377-394
44. Zheng X., Forest M.G., Vaia R., and Arlen M. A strategy for dimensional percolation in sheared nano-rod dispersions. Adv. Mater. 19 22 (2007) 4038-4043
45. X. Yang, M.G. Forest, W. Mullins, Q. Wang, Dynamic defect morphology and hydrodynamics of sheared nematic polymers in two space dimensions, J. Rheology, in press.
46. Yang X., Cui Z., Forest M.G., Shen J., and Wang Q. Dimensional robustness and instability of sheared, semi-dilute, nano-rod dispersions. SIAM. Multiscale Model. Simul. 7 (2008) 622-654