Flow analysis for wormlike micellar solutions in an axisymmetric capillary channel

Yamamoto, Takehiro; Hashimoto, Takamasa; Yamashita, Astushi

doi:10.1007/s00397-008-0288-x

Cited by 26 publications

(13 citation statements)

References 52 publications

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“…26,27) It was confirmed that the numerical simulation of steady flow in an axisymmetric from that for startup flows at constant average velocities. 26,27) In this case, an inflection point moves towards the channel center with time.…”

Section: Resultsmentioning

confidence: 78%

“…Correspondingly, j and t rz p show characteristic behavior near In experimental studies 26) , white turbidity phenomena were observed in a near wall region outside of an inflection point in velocity profile. It is considered that structural changes in micelar networks occur in this region.…”

Section: Resultsmentioning

confidence: 91%

“…The inner diameter of the tube is 3.4 mm, which is same as that of a channel used in our previous experiments. 26,27) We assume that the flow is uniform in the flow direction. Thus the MBM model expressed in the cylindrical coordinate system (r, q, z) is reduced to the following equations: …”

Section: Startup Flow In An Axisymmetric Channelmentioning

confidence: 99%

“…In the present study, we used a modified 23) was used as a constitutive equation for micellar solutions also in our previous studies 26,27) to numerically simulate the flow in a capillary channel. In addition, the numerical results were compared with experimental results of flow visualization and velocity measurements with particle tracking velocimetry.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Startup Flows of Wormlike Micellar Solutions in an Axisymmetric Capillary Channel using a Modified Bautista-Manero Model

Yamashita

Yamamoto

Hashimoto

2009

J. Soc. Rheol., Jpn

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Startup flows of wormlike micellar solutions in an axisymmetric capillary channel were numerically studied using a modified Bautista-Manero (MBM) model as a constitutive equation. The values of model parameter of the MBM model decided for a CTAB/NaSal solution were employed. The velocity profile at steady state predicted by the numerical simulation agreed with corresponding experimental data. The present study treated startup flows at a constant pressure gradient, which corresponds to a stress-controlled-type flow. The flow rate increased with time until the flow reached a steady state. The velocity profile had an inflection point around which the velocity gradient rapidly changed. The position of inflection point slightly changed with time. Temporal changes in both fluidity and the micellar contribution to shear stress occurred within a wall side region of the inflection point, where a white turbidity phenomenon was observed in our previous experiments. These temporal responses are characteristic of the startup flow at constant pressure gradients.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 91%

Section: Startup Flow In An Axisymmetric Channelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Startup Flows of Wormlike Micellar Solutions in an Axisymmetric Capillary Channel using a Modified Bautista-Manero Model

Yamashita

Yamamoto

Hashimoto

2009

J. Soc. Rheol., Jpn

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“…Refs. 7-9 and references therein), flow instabilities [10][11][12] , and the emergence of turbid region in various types of flows including Couette flows [13][14][15] , shear flows between parallel plates 16) , capillary flows 17) , flows past a falling sphere 18) , and contraction flows. 19,20) These phenomena are probably relevant to flow-induced gelation of micelles, whereas the relation between these phenomena and flow-induced structures of micelles is not yet clarified.…”

Section: Introductionmentioning

confidence: 99%

Adhesion and Growth Phenomena of Gel-like Materials Induced by Injection of NaSal into Flow of Aqueous Solution of CTAB

Yamamoto

Suzuki

Taniguchi

2012

J. Soc. Rheol., Jpn

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In aqueous solutions of cetyltrimethylammonium bromide (CTAB), wormlike micelles are formed at concentrations above a critical micelle concentration. In addition when counter ion is added to a CTAB solution, wormlike micelles entangle to form networks, which have gel-like structures under some conditions. The present study investigates the formation of gel-like structures when an aqueous solution of sodium salicylate (NaSal) is injected into a flow of a CTAB solution in a circular channel. The condition at which the adhesion of gel to a channel wall occurs is relevant to both the concentration of NaSal and the flow velocity of CTAB solutions. When the concentration is high, the adhesion is observed even at high velocities. Experimental results imply that salicylate ions in injected fluids have an important role in both the adhesion and the growth phenomena of gel-like materials on the channel wall and these phenomena depend on the concentration of NaSal.

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Experiments on the laminar oscillatory flow of wormlike micellar solutions

Casanellas

Ortı́n

2012

Rheol Acta

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We report new experimental results of the oscillatory flow of a solution of giant micelles in a narrow vertical tube. We explore small driving amplitudes (laminar flow) and a large range of driving frequencies. High-resolution particle image velocimetry measurements of the flow field in a meridional plane of the tube show that the velocity magnitude at the tube axis peaks at well-defined resonance frequencies, where the phase lag with the forcing changes abruptly. The velocity field is highly inflectional and eventually exhibits some hints of shear banding. The results are compared with theoretical predictions based on the upper-convected Maxwell and Oldroyd-B models of the linear shear rheology of the solution, and observed coincidences and discrepancies are discussed in detail.

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Flow analysis for wormlike micellar solutions in an axisymmetric capillary channel

Cited by 26 publications

References 52 publications

Numerical Simulation of Startup Flows of Wormlike Micellar Solutions in an Axisymmetric Capillary Channel using a Modified Bautista-Manero Model

Numerical Simulation of Startup Flows of Wormlike Micellar Solutions in an Axisymmetric Capillary Channel using a Modified Bautista-Manero Model

Adhesion and Growth Phenomena of Gel-like Materials Induced by Injection of NaSal into Flow of Aqueous Solution of CTAB

Experiments on the laminar oscillatory flow of wormlike micellar solutions

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