Nonhomogeneous flow of micellar solutions: A kinetic—network theory approach

García-Sandoval, J.P.; Campo, Angelina Martín del; Bautista, F.; Manero, Ο.; Puig, J. E.

doi:10.1002/aic.16079

Cited by 5 publications

(6 citation statements)

References 46 publications

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“…In summary, flow characteristics of the VES solution are unlike the Newtonian fluid, there is an “inviscid‐like flow area” in the joint of throat and pore. We conjecture that the wormlike micelles of the VES break into free short rod‐like micelles or even smaller structure under shear and extension effect at the vicinity of joint of throat and pore 44 . Away from the inlet, the influence of the viscosity and elastic on the flow patterns came back, owing to the recombination of wormlike micellar on relaxation 44 and causing the accumulation of streamlines from sides to the centerline at downstream.…”

Section: Resultsmentioning

confidence: 95%

Viscoelastic surfactant fluids filtration in porous media: A pore‐scale study

Dai

et al. 2020

AIChE Journal

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We investigated the flow of viscoelastic surfactant (VES) solutions, an important type of fracturing fluids for unconventional hydrocarbon recovery, through a divergingconverging microfluidic channel that mimics realistic unit in porous media. Newtonian fluid and viscoelastic hydrolyzed polyacrylamide (HPAM) solution were used as control groups. We vary Deborah numbers (De) up to 61.2, and found that the flow patterns of HPAM and VES solutions become very different once De ≥ 6.12. This is attributed to different generation mechanisms of viscoelasticity, thus different responses to extensional rates at pore-throats, for HPAM and VES solutions. It results in significantly smaller pressure drop of VES solutions through the microchannel compared to HPAM solution. It interprets higher filtration loss of VES solution than HPAM in core experiments and in field observations. The set-up can be generalized as a prototype to effectively evaluate the filtration of fracturing fluids.

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Section: Resultsmentioning

confidence: 95%

Viscoelastic surfactant fluids filtration in porous media: A pore‐scale study

Dai

et al. 2020

AIChE Journal

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“…The microstructures can be transformed into another one, following the entanglement/disentanglement processes of a transient network of chains. The kinetic process is assumed to have the following kinetics:

ω_{1, 0} ⇌ ω_{1, normaln} n = 1, 2, \dots

2 ω_{1, 0} ⇌ ω_{2, normaln} n = 1, 2, \dots

ω_{1, n_{1}} + ω_{2, n_{2}} ⇌ ω_{3, normaln} n, n_{1}, n_{2} = 1, 2, \dots

⋮

\sum_{normali = 1}^{\infty} \sum_{normalj = 1}^{\infty} w_{normali, normalj} ω_{normali, n_{j}} ⇌ ω_{normalm, normaln} m, n, n_{j} = 1, 2, \dots

where w i,j is the stoichiometric coefficient of microstate ω i,nj .…”

Section: Kineticsmentioning

confidence: 99%

“…Elsewhere, we analyzed the rheological behavior of micellar solutions under nonhomogeneous velocity and shear flow conditions . The irreversible thermodynamics framework allows the formulation of the reaction kinetics incorporating mesoscopic parameters into the macroscopic description of wormlike micellar systems.…”

Section: Introductionmentioning

confidence: 99%

“…Following the concept of reptation, Giesiesku improves on the idea of preaveraging conformation states by considering the drag coefficient to be an anisotropical tensor related to the state of deformation represented by a conformational tensor. The model developed by us elsewhere considers a meso–macro approach, which includes both entanglement–disentanglement and breakage–reformation kinetic processes in a coupled general description.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, we show that this single kinetics may give rise to complex flow behaviors, including shear‐thickening, shear‐thinning, and more complex flow histories such as shear‐banding. We use the previous thermodynamics framework but with a complexity reduction in the kinetics process; however, the nonlinearity on the equilibrium constant was kept in comparison with the approximation done in a previous contribution, where the exponential term was linearized, which allows predicting flow behaviors arising in complex fluids.…”

Section: Introductionmentioning

confidence: 99%

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A simple kinetic model for complex rheological fluids based on irreversible thermodynamics

et al. 2019

Self Cite

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In this work, we analyze the kinetics of the entanglement-disentanglement process of complex fluids coupled to a rheological constitutive equation of state within an irreversible thermodynamics framework. In the context of the coupling between the kinetics and the mechanical phenomena, we assume that the rate constants are functions of the affinities that contain the chemical potentials, which are themselves functions of the extended Gibbs free energy containing the irreversible dissipation terms. Although the derived model has a simple mathematical structure, it is able to predict complex flow behaviors, including shear-thickening, shear-thinning, and more complex flow histories such as shear-banding. As special case, we derive the constitutive equations of the Bautista-Manero-Puig (BMP) model in which the material constants have a thermodynamic basis and have been successfully used for the last two decades to predict the behavior of complex fluids such as the ones examined here.

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A technical note on large normal-stress differences observed in a novel self-assembling functionalized dipeptide surfactant solution

et al. 2022

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A number of functionalised dipeptides self-assemble in water under specific conditions to give micellar aggregates. The micellar aggregates formed depend on the exact molecular structure and are important to understand as they control the properties both of the micellar phase and also of the gel phase which can be formed from these precursor solutions. Here, we investigate the rheological properties of a functionalised dipeptide which behaves as a surfactant at high pH. This solution has been shown previously to exhibit very “stringy” behaviour, and this has previously been characterised using capillary breakup extensional rheometry (CaBER). In the current technical note, we extend the rheological characterisation of an exemplar precursor solution via small-amplitude oscillatory shear and steady shear. Using a cone-and-plate geometry and a dedicated protocol, we can measure the first normal-stress difference N1 and using a parallel-plate geometry to also measure (N1-N2), subsequently determining the second normal-stress difference N2. In so doing, we confirm that these systems are highly elastic, e.g. for shear rates greater than ~ 30 s−1, corresponding to a Weissenberg number based on the longest relaxation time ~ 330, N1 > 10τ where τ is the shear stress, and also, we find that N2 can be significant, is negative and approximately equal in magnitude to ~ 0.36 ± 0.05 N1. Significant uncertainties associated with the normal-stress difference data led to us using a range of different rheometers (and geometries) and highlight the issues with determining N2 using this two-measurement approach. Despite these uncertainties, the non-negligible value of the second-normal stress difference is demonstrated for these fluids.

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Nonhomogeneous flow of micellar solutions: A kinetic—network theory approach

Cited by 5 publications

References 46 publications

Viscoelastic surfactant fluids filtration in porous media: A pore‐scale study

Viscoelastic surfactant fluids filtration in porous media: A pore‐scale study

A simple kinetic model for complex rheological fluids based on irreversible thermodynamics

A technical note on large normal-stress differences observed in a novel self-assembling functionalized dipeptide surfactant solution

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