Rheological properties of salt-tolerant HPAM solutions with ultrahigh molecular weight

Abstract

The rheological properties of salt-tolerant partially hydrolyzed polyacrylamide (HPAM)solutions with molecular of 2.5×10⁷ g/mol at different concentrations were measured in steady-state shear flow mode by Haake Rheostress 150 rheometer. Three constitutive equations (Oldroyd four constant model, Guesekus model and FENE-P model) were used for describing the apparent viscosity and first normal stress difference. The apparent viscosity of salt-tolerant HPAM solutions appears a first Newtonian zone when the shear rate is approximately lower than 0.2 s⁻¹. At high shear rate, the HPAM solutions show shear-thinning and elasticity. The results show that the FENE-P model has the best agreement between theoretical and experimental data within the available shear rate range. The material parameters are useful for numerical analysis of polymer solution flow fields.

Keywords

salt-tolerant partially hydrolyzed polyacrylamide / steady-state flow / shear thinning / FENE-P model

References

[1] ZhangL.-h., ZhangD., JiangB.. The rheological behavior of salt tolerant polyacrylamide solutions [J]. Chem Eng Technol, 2006, 29(3): 395-400

[2] IliutaI., LarachiF.. Hydrodynamics of power-law fluids in trickle-flow reactors: Mechanistic model, experimental verification and simulations [J]. Chem Eng Sci, 2002, 57(11): 1931-1942

[3] PurnodeB., CrochetM. J.. Polymer solution characterization with the FENE-P model [J]. J Non-Netonian Fluid Mech, 1998, 77(1/2): 1-20

[4] WeiJ.-j., YaoZ.-qiang.. Rheological characteristics of drag-reducing surfactant solution [J]. Journal of Chemical Industry and Engineering (China), 2007, 58(2): 335-340

[5] YeZ.-y., HongL., LiuX.-l., YinT.-bing.. Constitutive model of rock based on microstructures simulation [J]. J Cent South Univ Technol, 2008, 15(2): 230-236

[6] BarisS.. Steady flow of an Oldroyd 4-constant fluid in a corner region formed by two planes [J]. Turk J Engin Environ Sci, 2001, 25(6): 587-594

[7] YooJ. Y., ChoiH. Ch.. On the steady simple shear flows of the one-mode Giesekus fluid [J]. Rheol Acta, 1989, 28(1): 13-24

[8] NakamuraK., MoriN., YamamotoT.. Examination of constitutive equations for polymer solutions [J]. J Text Mach Soc Japan, 1992, 38(2): 31-38

[9] PurnodeB., CrochetM. J.. Flows of polymer solutions through contractions Part I: Flows of polyacrylamide solutions through planar contractions [J]. J Non-Newtonian Fluid Mech, 1996, 65(2/3): 269-289

[10] ChengY., MunekataM., MatsuzakiK., OhbaH.. Numerical analysis of viscoelastic flow based on FENE-P model using high-order accuracy finite difference method [J]. Technical Reports of the Kumamoto University, 1999, 48(2): 381-393

[11] IuA. W., BornsideD. E., ArmstrongR. C., BrownR. A.. Viscoelastic flow of polymer solutions around a periodic, linear array of cylinders: comparisions of predictions for microstructure and flow fields [J]. J Non-Newtonian Fluid Mech, 1998, 77(3): 153-190