Effects of unsteadiness and non-Newtonian rheology on blood flow through a tapered time-variant stenotic artery

Zaman, Asad; Ali, Nasir; Sajid, Muhammad; Hayat, Tasawar

doi:10.1063/1.4916043

Cited by 35 publications

(19 citation statements)

References 35 publications

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“…Coronary artery disease is caused by atherosclerosis that occurred due to stenosis which formed as a result of fatty substances, cholesterol, cellular waste products, and smooth muscle cells accumulation on the arterial wall, [1]. Stenosis is a localize plaque that cause the narrowing on the vessel wall and causing an alternation in the flow structure which consequently reduced the fluid flow passing to the other organs and tissues, [2] As the plaque tend to rupture, an individual may suffer to the risk of cardiovascular disease such as heart attack and stroke.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Types of Stenosis on Generalized Power Law Model of Blood Flow in a Bifurcated Artery

Jamali

Ismail

Amin

2021

ARFMTS

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This study is focus on generalized power law model of blood flow in a stenosed bifurcated artery under the effect of different types of stenosis. Stenosis can cause the narrowing of the artery that may reduce the flow of blood supply to the heart, and this may lead to the heart attacks. The geometry of the bifurcated artery with different classification of stenosis locations is considered in order to shows four possible morphologies formation of plaque from healthy artery to disease artery. The bifurcated artery is modelled as a two-dimensional rigid wall since the wall of a disease artery is reported to be less flexibility. Few assumptions are considered such as blood are incompressible, laminar, steady and characterized as the generalized power-law model. Simulation results are obtained using COMSOL Multiphysics 5.2, which is a software that based on the finite element method to solve this problem. Results concerning the effect of different locations of stenosis on generalized power law model of the blood flow characteristic such as streamlines pattern are discussed.

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Section: Introductionmentioning

confidence: 99%

Effect of Different Types of Stenosis on Generalized Power Law Model of Blood Flow in a Bifurcated Artery

Jamali

Ismail

Amin

2021

ARFMTS

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“…In this research we forced the body to have a certain acceleration to be closer to the real model (Travelers roller coaster, using jackhammer and etc.) compared with the previous works, in this way, a dynamical parameter is added to the simulation of blood flow [11][12]. This acceleration affects the blood flow to have some abnormal and sometimes dangerous reactions against the sudden movements which need to be investigated (loss of vision, increasing heart rate, abdominal pain, bleeding in the face) [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Heat Transfer and Flow Characteristics of Pulsatile Blood Flow in a Tapered Artery with a Combination of Stenosis and Aneurysm

Haghighi¹,

Pirhadi²

2019

IJHT

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This research focuses on numerical patterns of temperature distribution and blood flow through tapered arteries. The blood flow is considered as an incompressible and fully developed flow with Non-Newtonian nature assumed as modified Cross fluid which is inside a body under certain acceleration. Also, the impact of heat transfer regarding a single layer model on an unstable and pulsatile blood flow through a designed tapered artery with a combination of stenotic and aneurysm is investigated. The wall of artery is designed as an elastic tube, so, its geometry changes during the numerical computations is up to time. This research uses a suitable coordinate transformation to create an exact mesh with rectangular mesh units. In the case of the thermophysical parameters of blood flow field including the velocity pattern and temperature distributions, the governing equations are managed and solved based on the finite difference method and then, the reported results are discussed as a function of velocity and temperature. The outputs of this mathematical modeling are compared with some available and proved results in previous researches to confirm the accuracy and validity of the method. The variations in dynamic features of blood flow wall shear stress, volumetric flow rate and flow resistance can be analyzed and computed on basis of the pattern of velocity profile in assumed domain. Furthermore, contour plots of temperature and velocity for specified parameters are provided.

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“…Some recent studies dealing with flows of Carreau fluids can be found in refs. [18][19][20]. Moreover, it is strongly anticipated that the speed of the organism, forces generated by organism and power required for propulsion will be substantially influenced by the material relaxation time and the rheological power-law index.…”

Section: Introductionmentioning

confidence: 99%

Bacterial gliding fluid dynamics on a layer of non-Newtonian slime: Perturbation and numerical study

Ali

Asghar

Bég

et al. 2016

Journal of Theoretical Biology

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Abstract:Gliding bacteria are an assorted group of rod-shaped prokaryotes that adhere to and glide on certain layers of ooze slime attached to a substratum. Due to the absence of organelles of motility, such as flagella, the gliding motion is caused by the waves moving down the outer surface of these rodshaped cells. In the present study we employ an undulating surface model to investigate the motility of bacteria on a layer of non-Newtonian slime. The rheological behavior of the slime is characterized by an appropriate constitutive equation, namely the Carreau model. Employing the balances of mass and momentum conservation, the hydrodynamic undulating surface model is transformed into a fourth-order nonlinear differential equation in terms of a stream function under the long wavelength assumption. A perturbation approach is adopted to obtain closed form expressions for stream function, pressure rise per wavelength, forces generated by the organism and power required for propulsion. A numerical technique based on an implicit finite difference scheme is also employed to investigate various features of the model for large values of the rheological parameters of the slime. Verification of the numerical solutions is achieved with a variational finite element method (FEM). The computations demonstrate that the speed of the glider decreases as the rheology of the slime changes from shear-thinning (pseudo-plastic) to shear-thickening (dilatant). Moreover, the viscoelastic nature of the slime tends to increase the swimming speed for the shear-thinning case. The fluid flow in the pumping (generated where the organism is not free to move but instead generates a net fluid flow beneath it) is also investigated in detail. The study is relevant to marine anti-bacterial fouling and medical hygiene biophysics.

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Effects of unsteadiness and non-Newtonian rheology on blood flow through a tapered time-variant stenotic artery

Cited by 35 publications

References 35 publications

Effect of Different Types of Stenosis on Generalized Power Law Model of Blood Flow in a Bifurcated Artery

Effect of Different Types of Stenosis on Generalized Power Law Model of Blood Flow in a Bifurcated Artery

A Numerical Study of Heat Transfer and Flow Characteristics of Pulsatile Blood Flow in a Tapered Artery with a Combination of Stenosis and Aneurysm

Bacterial gliding fluid dynamics on a layer of non-Newtonian slime: Perturbation and numerical study

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