Peristaltic Pumping of Thixotropic Fluids: a Numerical Study

Nezamidoost, Siamak; Sadeghy, Kayvan

doi:10.1678/rheology.40.1

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…This fluid model has successfully been used in the past to investigate thixotropic effects in a number of complex flow geometries. [26][27][28] We are particularly interested pulsatile flow. To that end, the paper is organized as follows:…”

Section: Most Industrial Fluids and Virtually All Physiological Fluidsmentioning

confidence: 99%

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Pulsatile Flow of Thixotropic Fluids through a Partially-Constricted Tube

Nezamidoost

Sadeghy

Askari

2013

J. Soc. Rheol., Jpn

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Pulsatile flow of thixotropic fluids is investigated numerically in a partially-constricted tube assuming that the fluid obeys Moore's structural model as is constitutive equation. Assuming that the flow is laminar, incompressible, two-dimensional and axisymmetric, the equations of motion are simplified using lubrication theory. The simplified equations are then solved numerically using the finite difference method. A suitable coordinate transformation is used to immobilize the boundary of the tube. The effect of the structure breakdown/reformation parameters is investigated on the velocity field and wall shear stress distribution. The importance of the geometrical parameters of the constriction is also investigated on the flow characteristics.

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Section: Most Industrial Fluids and Virtually All Physiological Fluidsmentioning

confidence: 99%

“…As previously mentioned, this popular thixotropic fluid model has successfully been used in several numerical studies in recent years. [26][27][28] Now, before attempting to solve the governing equations, ( 1 2 ) a r 1 1 ( 1 2 ) a r 1 1 , …”

Section: Mathematical Formulationmentioning

confidence: 99%

Pulsatile Flow of Thixotropic Fluids through a Partially-Constricted Tube

Nezamidoost

Sadeghy

Askari

2013

J. Soc. Rheol., Jpn

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“…A key motivation is the transport of crude oil and drilling fluids in pipelines [2,[5][6][7][8]. Other related applications include extrusion [9], peristaltic pumping [10], and pulsatile flow [11,12]. Such applications often involve complex geometries and time-dependent effects, and so there is a role for the study of paradigm problems that bridge the gap between them and much simpler rheometric flows (e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

Thixotropic pumping in a cylindrical pipe

2020

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We consider the flow of a thixotropic fluid in a uniform cylindrical pipe, driven by an oscillating pressure gradient or a body force. For a variety of rheological models, solutions can be obtained by integrating ordinary rather than partial differential equations: We illustrate this approach for the thixoviscoplastic Houška model and the thixoviscous simplified Moore-Mewis-Wagner model. We present asymptotic results in the limits of small and large Deborah numbers and numerical results for intermediate Deborah numbers. Under asymmetrical "sawtooth" forcing, thixotropy leads to the net transport of fluid along the pipe, even when there would be no net transport of the corresponding generalized-Newtonian fluid. We propose the name "thixotropic pumping" for this transport mechanism.

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“…[4][5][6][7][8] In recent years more complex geometries such as boundary-layer flows, lubricating flows, peristaltic flow, and cavitating flow have also been addressed for thixotropic fluids. [9][10][11][12][13][14][15][16][17] In the majority of cases, simple thixotropic models such as Harris model 11) , or Moore model. [12][13][14][15][16] have been used in these studies.…”

Section: Introductionmentioning

confidence: 99%

Dynamic of Gas Bubbles Surrounded by a Dullaert-Mewis Thixotropic Fluid

Ahmadpour

Amini-Kafiabad

Sadeghy

2014

J. Soc. Rheol., Jpn

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In the present work, the dynamics of a single spherical gas bubble surrounded by an elastic thixotropic liquid is addressed at the presence of an acoustic pressure field. The well-known Dullaert and Mewis' rheological model is used to represent different aspects of the fluid's thixotropic and elastic behavior. A numerical method based on Gauss-Laguerre quadrature is adopted to integrate the integro-differential equation governing bubble dynamics. The numerical results suggest that bubble response is significantly affected by the thixotropic properties of the surrounding fluid. A competition between the time constant set forth by the fluid's elasticity and the time constant related to the fluid's thixotropicity is predicted to give rise to the generation of second harmonics in the bubble's response for certain range of model parameters.

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Peristaltic Pumping of Thixotropic Fluids: a Numerical Study

Cited by 12 publications

References 25 publications

Pulsatile Flow of Thixotropic Fluids through a Partially-Constricted Tube

Pulsatile Flow of Thixotropic Fluids through a Partially-Constricted Tube

Thixotropic pumping in a cylindrical pipe

Dynamic of Gas Bubbles Surrounded by a Dullaert-Mewis Thixotropic Fluid

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