Rheological properties of aqueous polyacrylamide solutions

Ghannam, Mamdouh T.; Esmail, M. N.

doi:10.1002/(sici)1097-4628(19980822)69:8<1587::aid-app13>3.0.co;2-s

Cited by 47 publications

(38 citation statements)

References 4 publications

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“…We observe a viscoelastic behavior, where the elastic property is dominant at low shear rate. This is in agreement with what has already been observed for such polymer solutions [22]. The relaxation time can be approximated as the time where the two modulus are equals.…”

Section: Experimental Set-up and Test Fluidssupporting

confidence: 92%

Encapsulation of Droplets Using Cusp Formation Behind a Drop Rising in a Non-Newtonian Fluid

Poryles¹,

Zenit²

2018

Preprint

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Abstract:The rising of an oil drop in a non-Newtonian viscous solution is studied experimentally. In this case, the shape of the ascending drop is strongly affected by the non-Newtonian properties of the surrounding liquid. We found that the so-called velocity discontinuity phenomena is observed for drops larger than a certain critical size. Beyond the critical velocity, the formation of a long tail is observed, from which small droplets are continuously emitted. We determined that the fragmentation of the tail results mainly from the effect of capillary effects. We explore the idea of using this configuration as a new encapsulation technique, where the size and frequency of droplets can be well predicted.

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Section: Experimental Set-up and Test Fluidssupporting

confidence: 92%

Encapsulation of Droplets Using Cusp Formation Behind a Drop Rising in a Non-Newtonian Fluid

Poryles¹,

Zenit²

2018

Preprint

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“…We observe a viscoelastic behaviour, where the elastic property is dominant at a low shear rate. This is in agreement with what has already been observed for such polymer solutions [32]. The relaxation time can be approximated as the time where the two moduli are equal and represents the typical time where the non-Newtonian fluid goes from an elastic solid behaviour to a viscous fluid.…”

Section: Experimental Set-up and Test Fluidssupporting

confidence: 91%

“…In this zone, the viscosity follows a power law: η = Kγ n−1 , where n = 0.87 and K = 1.10 as represented in Figure 2b. This type of decrease is typical for polyacryalimde solutions [31,32]. This exponent n being close to 1 (Newtonian behaviour for n = 1) indicates that the shear-thinning is insignificant in our experiment.…”

Section: Experimental Set-up and Test Fluidssupporting

confidence: 75%

Encapsulation of Droplets Using Cusp Formation behind a Drop Rising in a Non-Newtonian Fluid

Poryles

Zenit

2018

Fluids

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Abstract:The rising of a Newtonian oil drop in a non-Newtonian viscous solution is studied experimentally. In this case, the shape of the ascending drop is strongly affected by the viscoelastic and shear-thinning properties of the surrounding liquid. We found that the so-called velocity discontinuity phenomena is observed for drops larger than a certain critical size. Beyond the critical velocity, the formation of a long tail is observed, from which small droplets are continuously emitted. We determined that the fragmentation of the tail results mainly from the effect of capillary effects. We explore the idea of using this configuration as a new encapsulation technique, where the size and frequency of droplets are directly related to the volume of the main rising drop, for the particular pair of fluids used. These experimental results could lead to other investigations, which could help to predict the droplet formation process by tuning the two fluids' properties, and adjusting only the volume of the main drop.

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“…Non-Newtonian behavior includes both shear thinning and shear thickening regions. [72][73][74] The shear-thickening behavior is normally observed after a critical shear rate. The value of the critical shear mainly depends on the degree of hydrolysis, molecular weight, polymer concentration, and temperature.…”

Section: Rheology Of Hpammentioning

confidence: 99%

Review on Polymer Flooding: Rheology, Adsorption, Stability, and Field Applications of Various Polymer Systems

Kamal¹,

Sultan²,

et al. 2015

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Polymer flooding is one of the most promising techniques for the recovery of remaining oil from light oil reservoirs. Water soluble polymers are used to enhance the viscosity of displacing fluid and to improve the sweep efficiency. In this paper, water soluble polymers used for chemical enhanced oil recovery are reviewed. Conventional and novel modified polymers are discussed along with their limitations. The review covers thermal stability, rheology, and adsorption behavior of various polymer systems in sandstone and carbonate reservoirs. Field and laboratory core flooding data of several polymers are covered. The review describes the polymer systems that are successfully applied in low-temperature and low-salinity reservoirs. Comprehensive review of current research activities aiming at extending polymer flooding to high-temperature and high-salinity reservoirs is performed. The review has identified current and future challenges of polymer flooding.

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Rheological properties of aqueous polyacrylamide solutions

Cited by 47 publications

References 4 publications

Encapsulation of Droplets Using Cusp Formation Behind a Drop Rising in a Non-Newtonian Fluid

Encapsulation of Droplets Using Cusp Formation Behind a Drop Rising in a Non-Newtonian Fluid

Encapsulation of Droplets Using Cusp Formation behind a Drop Rising in a Non-Newtonian Fluid

Review on Polymer Flooding: Rheology, Adsorption, Stability, and Field Applications of Various Polymer Systems

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