Flow behavior of dilute polyacrylamide solutions through porous media. 1. Influence of chain length, concentration, and thermodynamic quality of the solvent

Kulicke, Werner‐Michael; Haas, R.

doi:10.1021/i100015a008

Cited by 63 publications

(48 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[25,26] Studies show that the Carman-Kozeny relation can be used for dense, disordered packed beds, irrespective of particle size and shape. [27,28] Although a variation of a factor of 2, our calculation of capillary number (Fig. 6) does not change considerably.…”

Section: Forces Determining the Drying Behaviormentioning

confidence: 73%

Transport of a water-soluble polymer during drying of a model porous media

et al. 2017

View full text Add to dashboard Cite

This article presents an experimental investigation on transport of methylhydroxyethylcellulose (MHEC) during drying of a model porous material. Nuclear magnetic resonance imaging and thermogravimetric analysis are used to measure water and MHEC transport, respectively. MHEC is added to glue mortars to increase open time, i.e., the time period during which tiles can be applied with sufficiently good adhesion. Previous work showed that MHEC promotes a receding front during drying and therefore leads to differences in the degree of hydration throughout the mortar sample, i.e., the top surface shows poor hydration and the bottom surface shows good hydration. In this study, we investigate the transport of MHEC during drying of a model porous material, consisting of packed glass beads saturated with an aqueous MHEC solution. At MHEC concentration less than 1.3 wt%, homogeneous drying is observed, enabling advective transport of MHEC toward the drying surface. In this case, accumulation of MHEC may form a skin at the top surface and below this skin layer, a gel zone may form, which allows migration of water toward the evaporation surface. When the MHEC concentration is above 1.3 wt%, front receding drying is observed, which prevents transport of MHEC, resulting in a more homogeneous distribution of MHEC. ARTICLE HISTORY

show abstract

Section: Forces Determining the Drying Behaviormentioning

confidence: 73%

Transport of a water-soluble polymer during drying of a model porous media

et al. 2017

View full text Add to dashboard Cite

show abstract

“…where Re i p is an 'inner Reynolds number' defined by: Figure 2a of Kulicke and Haas (1984) at Λ = 500. Under the conditions represented, it follows that when Λ is constant the Deborah number is also constant though different for the two solutions in the different solvents.…”

Section: Friction Factor/resistance Factormentioning

confidence: 99%

“…The Canadian Journal of Chemical Engineering, Volume 80, October 2002 p for flow in a packed bed of 50 ppm polyacrylamide (M w = 18.2 × 1 0 6 ) in 0.5 M NaCl solution for Λ = 500, based on data of Kulicke and Haas (1984).…”

Section: Introduction Of a Reynolds Numbermentioning

confidence: 99%

“…With the exception of the porosity, all of the additional information required for evaluation of k e using Equation (43) are provided by Kulicke and Haas (1984). The Λ max values were read directly from the plots in Figure 2, and 36k i is 185 (corresponding to a Kozeny constant of 5.14).…”

Section: Introduction Of a Reynolds Numbermentioning

confidence: 99%

“…This fluid model is of interest because of the fundamental basis it provides for a systematic representation of flow in packed beds or porous media coupled with the i n s i g h t provided into the role of the molecular properties in characterization of the flow behaviour. A considerable body of knowledge (Durst and Haas, 1981;Haas and Durst, 1982;Kulicke and Haas, 1984;Haas and Kulicke, 1984) …”

mentioning

confidence: 99%

See 2 more Smart Citations

Flow of a FENE Fluid in Packed Beds or Porous Media

Kozicki

2002

Can J Chem Eng

View full text Add to dashboard Cite

V iscoelastic flow in packed beds or porous media finds application in such diverse areas as petroleum crude recovery, flow in soils and in filtration of suspensions in polymer solutions or melts. The formulations describing the flow of viscous fluids do not apply to viscoelastic fluids as a consequence of the discovery (Sadowski and Bird, 1965;Marshall and Metzner, 1967;Dauben and Menzie, 1967;Savins, 1969) that in flows through packed beds or porous media viscoelastic fluids exhibit enhanced potential drops exceeding those predicted on the basis of the viscous flow behaviour. It may be noted that Christopher and Middleman (1965) developed an equation based on the Kozeny-Ergun bed model (Kozicki, 2001) that successfully predicts the flow of high shear-thinning fluids (Kozicki and Tiu, 1988) and provides an improved fit of the data of Sadowski and Bird (1965). The increased flow resistance of viscoelastic fluids has been attributed (James and McLaren, 1975;Bird et al., 1977b;Kulicke and Haas, 1984) to the enhanced normal stresses generated by these fluids when subjected to elongational flow fields. The attempts at analytical characterization have been hampered by the joint complexity of the problems associated with the flow geometry and the rheological behaviour of viscoelastic fluids.In the previous study (Kozicki, 2001), a general analysis of viscoelastic flow in porous media was developed based on a capillary hybrid flow model which incorporates an elongational flow mode in addition to the shear mode. The velocity variation in the axial direction was achieved by utilization of a mass source distribution. The increase in the potential drop attributed to elongational flow was evaluated from the energy dissipation rate associated with the elongational mode. The analysis yielded expressions for the flow rate in packed bed and porous media flows, including Darcy's law, and a general expression for the friction factor in terms of the familiar Reynolds number for viscous flow and an analogous Reynolds number expression containing the mean elongational viscosity characterizing the elongational mode of the flow. Since the analysis was conducted entirely in terms of the elongational viscosity of the fluid, the results apply to any arbitrary rheological fluid model.In the following, the formulation is applied to fluids described by the FENE model derived by kinetic theory (Bird et al., 1977b). The FENE fluid designation refers to a dilute polymer solution comprised of linear macromolecules which are represented by elastic dumbbells. Each dumbbell consists of two beads joined by a finitely extendible nonlinear elastic (FENE) spring, as proposed by Warner (1972). This fluid model is of interest because of the fundamental basis it provides for a systematic representation of flow in packed beds or porous media coupled with the i n s i g h t provided into the role of the molecular properties in characterization of the flow behaviour. A considerable body of knowledge (Durst and Haas, 1981;Haas and Durst, 1982;Kulicke and Haas,...

show abstract

Flow of mixtures of poly(ethylene oxide) and hydrolyzed polyacrylamide solutions through porous media

Kauser

Santos

Delgado

et al. 1999

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

In this work, the porous media flow of polymer solutions of poly(ethylene oxide) (PEO), hydrolyzed polyacrylamide (HPAA), and their blends is investigated. Aqueous solutions of PEO exhibit critical extension thickening when flowing through porous media. HPAA solutions also exhibit critical extension thickening in excess salt environments, but their behavior changes to a more gradual extension thickening when dissolved in deionized water. The mixtures of solutions of HPAA and PEO therefore vary its porous media flow behavior, depending on the ionic environment. In deionized water, a critical extension thickening similar to that obtained with PEO is still observed when HPAA is mixed in at concentrations low enough so that its apparent viscosity does not mask the influence of PEO. In the presence of salt, only a critical extension thickening is observed, which is attributed to transient network formation of both PEO and HPAA molecules. The mixtures generally exhibit a less critical behavior and display a lower than expected sensitivity of the onset Reynolds number for extension thickening with concentration. The results presented herein indicate that interspecies molecular interactions through transient network formation and the associated flow modification play a major role in determining the complex non-Newtonian flow behavior of these polymer solutions.

show abstract

Flow behavior of dilute polyacrylamide solutions through porous media. 1. Influence of chain length, concentration, and thermodynamic quality of the solvent

Cited by 63 publications

References 2 publications

Transport of a water-soluble polymer during drying of a model porous media

Transport of a water-soluble polymer during drying of a model porous media

Flow of a FENE Fluid in Packed Beds or Porous Media

Flow of mixtures of poly(ethylene oxide) and hydrolyzed polyacrylamide solutions through porous media

Contact Info

Product

Resources

About