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Artykuły w czasopismach na temat „Axially Symmetric Stenosis”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Akbar, Noreen Sher. "Metallic nanoparticles analysis for the blood flow in tapered stenosed arteries: Application in nanomedicines." International Journal of Biomathematics 09, no. 01 (2015): 1650002. http://dx.doi.org/10.1142/s1793524516500029.

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Blood flow model is recycled to study the influence of magnetic field and nanoparticles in tapered stenosed arteries. The metallic nanoparticles for the blood flow with water as base fluid are not explored so far. The representation for the blood flow is through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is another important feature of our analysis. Exact solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing s

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Akbar, Noreen Sher, and S. Nadeem. "Blood flow analysis in tapered stenosed arteries with pseudoplastic characteristics." International Journal of Biomathematics 07, no. 06 (2014): 1450065. http://dx.doi.org/10.1142/s179352451450065x.

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In this paper, the blood flow through a tapered artery with a stenosis by considering axially non-symmetric but radially symmetric mild stenosis on blood flow characteristics is analyzed, assuming the flow is steady and blood is treated as Williamson fluid. Perturbation solutions have been evaluated for velocity, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different type of tapered arteries (i.e. converging tapering, diverging tapering, non-tapered artery) have been examined for different parameters of interest.

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3

Akbar, Noreen Sher, and S. Nadeem. "Mathematical analysis of Phan-Thien–Tanner fluid model for blood in arteries." International Journal of Biomathematics 08, no. 05 (2015): 1550064. http://dx.doi.org/10.1142/s1793524515500643.

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In the present paper, we have studied the blood flow through tapered artery with a stenosis. The non-Newtonian nature of blood in small arteries is analyzed mathematically by considering the blood as Phan-Thien–Tanner fluid. The representation for the blood flow is through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is another important feature of our analysis. Exact solutions have been evaluated for velocity, resistance impedance, wall shear stress and

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4

Shah, Sapna Ratan. "Clinical Significance of Aspirin on Blood Flow through Stenotic Blood Vessels." Journal of Biomimetics, Biomaterials and Tissue Engineering 10 (May 2011): 17–24. http://dx.doi.org/10.4028/www.scientific.net/jbbte.10.17.

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In this present study a two-phase model for the influence of aspirin on peripheral layer viscosity for physiological characteristics of blood flow through stenosed blood vessels using Casson’s fluid model has been obtained. Flow of blood with axially non-symmetric but radially symmetric stenosis geometry is considered. The non-linear pressure equations have been solved with help of boundary conditions and the results are displayed graphically for different flow characteristics. It was found that the resistance to flow decreases as stenosis shape parameter increases whereas the resistance to fl

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5

Akbar, Noreen Sher. "Blood flow of Carreau fluid in a tapered artery with mixed convection." International Journal of Biomathematics 07, no. 06 (2014): 1450068. http://dx.doi.org/10.1142/s1793524514500685.

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This research is concerned with the mathematical modeling and analysis of blood flow in a tapered artery with stenosis. The analysis has been carried out in the presence of heat and mass transfer. Constitutive equation of Carreau fluid has been invoked in the mathematical formulation. The representation of blood flow is considered through an axially non-symmetrical but radially symmetric stenosis. Symmetry of the distribution of the wall shearing stress and resistive impedance and their growth with the developing stenosis is given due attention. Solutions have been obtained for the velocity, t

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6

Akbar, Noreen Sher. "Mixed convection analysis for blood flow through arteries on Williamson fluid model." International Journal of Biomathematics 08, no. 04 (2015): 1550045. http://dx.doi.org/10.1142/s179352451550045x.

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In this paper, the blood flow through a tapered artery with a stenosis by considering axially non-symmetric but radially symmetric mild stenosis on blood flow characteristics is analyzed, assuming the flow is steady and blood is treated as Williamson fluid. The effects of mixed convection heat and mass transfer are also carried out. Perturbation solutions have been calculated for velocity, temperature, concentration, resistance impedance, wall shear stress and shearing stress at the stenosis throat. The graphical results of different types of tapered arteries (i.e. converging tapering, divergi

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7

MISHRA, SHAILESH, NARENDRA KUMAR VERMA, and S. U. SIDDIQUI. "A SUSPENSION MODEL FOR BLOOD FLOW THROUGH A CATHETERIZED ARTERY." International Journal of Biomathematics 05, no. 05 (2012): 1250033. http://dx.doi.org/10.1142/s1793524511001714.

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The present work is concerned with the analysis of an axi-symmetric flow of blood through coaxial tubes where the outer tube has an axially symmetric mild stenosis and the inner tube has a balloon which is axi-symmetric in nature. The mild stenosis approximation is used to solve the present problem. The effect of the volume fraction density of the particles, the maximum height attained by the balloon, the radius of the inner tube, which keeps the balloon in position k, and the axial displacement of the balloon have been studied. Flow parameters such as the resistive impedance, the wall shear s

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8

Ratan Shah, Sapna, and S. U. Siddiqui. "A Physiologic Model for the Problem of Blood Flow through Diseased Blood Vessels." International Journal of Advances in Applied Sciences 5, no. 2 (2016): 58. http://dx.doi.org/10.11591/ijaas.v5.i2.pp58-64.

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This study focuses on the behavior of blood flow through diseased artery in the presence of porous effects. The laminar, incompressible, fully developed, non-Newtonian in an artery having axially non-symmetric but radially symmetric stenosis is numerically studied. Here blood is represented as Herschel-Bulkley fluid model and flow model is shown by the Navier-Stokes and the continuity equations. Using appropriate boundary conditions, numerical expression for volumetric flow rate, pressure drop and wall shear stress have been derived. The expressions are computed numerically and results are pre

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9

Diwakar, Chandrashekhar, and Sanjeev Kumar. "Effects of Axially Symmetric Stenosis on the Blood Flow in an Artery Having Mild Stenosis." International Journal of Mathematics Trends and Technology 35, no. 3 (2016): 163–67. http://dx.doi.org/10.14445/22315373/ijmtt-v35p522.

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10

Sapna, Ratan Shah, U. Siddiqui S., and Singh Anuradha. "A MATHEMATICAL MODEL TO STUDY THE SIMILARITIES OF BLOOD FLUID MODELS THROUGH INCLINED MULTI-STENOSED ARTERY." International Journal of Engineering Research and Modern Education 2, no. 1 (2017): 108–15. https://doi.org/10.5281/zenodo.801359.

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A mathematical model is presented to comparative steady of the flow behavior of Casson’s and Bingham Plastic fluid model through an inclined tube of non-uniform cross-section with multiple stenoses. The equation describing the flow has been solved and the expressions parameters on flow variables have been studied. The present study may be helpful for better understanding the flow characteristics of blood having multiple stenoses.<strong> </strong>The graphical representations have been made to validate the analytical findings with a view of its applicability to stenotic diseases. It is found t

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11

Wahab, Abdul, Muhammad Imran Asjad, Muhammad Bilal Riaz, and Jamil Abbas Haider. "Modeling and simulation of blood flow in unhealthy elliptic arteries with computational fluid dynamics approach." PLOS ONE 20, no. 4 (2025): e0317989. https://doi.org/10.1371/journal.pone.0317989.

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This study investigates the influence of varying degrees of stenosis on blood flow within elliptic arteries, emphasizing the critical role of artery shape in clinical evaluations as opposed to the commonly studied circular arteries. Unlike prior work, this research offers a precise definition of stenosis by incorporating the measured length, height, and position of the narrowing. Employing the non-Newtonian Williamson fluid model, we conducted comprehensive numerical simulations to examine blood flow through four distinct stenosis formations. The novelty of this work lies in its accurate model

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12

Liepsch, D., A. Poll, and R. Blasini. "Correlation Between LDA and Ultrasound Heart Catheter Measurements in a Stenosed Arterial Model." Journal of Biomechanical Engineering 117, no. 1 (1995): 103–6. http://dx.doi.org/10.1115/1.2792257.

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Ultrasound heart catheters are used to measure the velocity in coronary arteries. However, the act of introducing a catheter into the vessel disturbs the very flow being measured. We used laser Doppler anemometry to measure the velocity distribution in an axially symmetric model, both with and without a catheter inserted. The catheter reduced the center-line velocity by as much as 60 percent at a distance of 2 mm downstream from the catheter, and by as much as 25 percent at a distance of 10 mm. This means the velocity measured with an ultrasound catheter does not show the maximum velocity of t

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13

Pfensig, Sylvia, Sebastian Kaule, Michael Sämann, et al. "Assessment of heart valve performance by finite-element design studies of polymeric leaflet-structures." Current Directions in Biomedical Engineering 3, no. 2 (2017): 631–34. http://dx.doi.org/10.1515/cdbme-2017-0132.

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AbstractFor the treatment of severe symptomatic aortic valve stenosis, minimally invasive heart valve prostheses are increasingly used, especially for elderly patients. The current generation of devices is based on xenogenic leaflet material, involving limitations with regard to calcification and durability. Artificial polymeric leaflet-structures re-present a promising approach for improvement of valve performance. Within the current work, finite-element ana-lysis (FEA) design studies of polymeric leaflet structures were conducted. Design of an unpressurized and axially-symmetric trileaflet h

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14

Akhtar, Salman, Zahir Hussain, Sohail Nadeem, I. M. R. Najjar, and A. M. Sadoun. "CFD analysis on blood flow inside a symmetric stenosed artery: Physiology of a coronary artery disease." Science Progress 106, no. 2 (2023): 003685042311800. http://dx.doi.org/10.1177/00368504231180092.

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This research article interprets the computational fluid dynamics analysis on blood flow inside a symmetric stenosed artery. The current problem models the blood flow inside the left coronary artery as having a symmetric stenosis in the central region. A comprehensive physiological examination of coronary artery disease is numerically evaluated by using the computational fluid dynamics toolbox Open-Field Operation And Manipulation. There are no assumptions of mild stenosis taken into account since the considered stenosis has an exactly measured length, height and position, etc. The blood flow

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15

Cavalcanti, S., P. Bolelli, and E. Belardinelli. "Pressure Drops Through Arterial Stenosis Models in Steady Flow Condition." Journal of Biomechanical Engineering 114, no. 3 (1992): 416–18. http://dx.doi.org/10.1115/1.2891404.

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Measures of pressure drops were made in two different plexiglass models of axial-symmetric arterial stenoses. The stenosis models had the same are reduction (86 percent) but were of different length so as to have a different tapering degree. Pressures were measured in steady flow condition at three equidistant points of the stenosis: upstream, in the middle, and downstream. Results indicate that: the upstream-middle pressure drop is independent of tapering degree but is highly influenced by area reduction; moreover it is much greater than the middle-downstream drop. The upstream-middle pressur

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16

Pokharel, Chudamani, Pushpa Nidhi Gautam, Samundra Timilsina Tripathee, Chet Raj Bhatta, and Jeevan Kafle. "Analysis of flow parameters in blood flow through mild stenosis." Nepalese Journal of Zoology 6, no. 2 (2022): 39–44. http://dx.doi.org/10.3126/njz.v6i2.51882.

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A buildup of plaque that contracts arteries and decreases blood flow to the heart causes chest pain, difficulties in breathing, or another coronary artery disease, medically called stenosis puts our lives at risk. We have used Navier-Stokes equations in a cylindrical polar coordinate system to study this problem by considering the flow is steady, axially symmetrical, fully developed, and laminar. Flow parameters like velocity profile, pressure drop, shear stress, and volumetric flow rate in the stenosed regions are analyzed after getting analytical solutions. We have focused our study to know

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17

Nandal, J., S. Kumari, and R. Rathee. "The Effect of Slip Velocity on Unsteady Peristalsis MHD Blood Flow through a Constricted Artery Experiencing Body Acceleration." International Journal of Applied Mechanics and Engineering 24, no. 3 (2019): 645–59. http://dx.doi.org/10.2478/ijame-2019-0040.

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Abstract In this analysis, we present a theoretical study to examine the combined effect of both slip velocity and periodic body acceleration on an unsteady generalized non-Newtonian blood flow through a stenosed artery with permeable wall. A constant transverse magnetic field is applied on the peristaltic flow of blood, treating it as an elastico-viscous, electrically conducting and incompressible fluid. Appropriate transformation methods are adopted to solve the unsteady non-Newtonian axially symmetric momentum equation in the cylindrical polar coordinate system with suitably prescribed cond

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18

PONALAGUSAMY, R., and S. PRIYADHARSHINI. "COUPLE STRESS FLUID MODEL FOR PULSATILE FLOW OF BLOOD IN A POROUS TAPERED ARTERIAL STENOSIS UNDER MAGNETIC FIELD AND PERIODIC BODY ACCELERATION." Journal of Mechanics in Medicine and Biology 17, no. 08 (2017): 1750109. http://dx.doi.org/10.1142/s0219519417501093.

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In this paper, a magnetic and non-Newtonian fluid model for pulsatile flow of blood with periodic body acceleration has been investigated by adopting Laplace transform and finite Hankel transform. A closed form of analytic solution is obtained for physiologically important quantities such as velocity profile, flow rate, wall shear stress and flow resistance. Effects of different physical parameters reflecting couple stress parameter, Darcy number, Hartman number, tapering angle (divergent tapered tube or convergent tapered tube), shape stenosis parameter and amplitude of periodic acceleration

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19

VERMA, V. K., M. P. SINGH, and V. K. KATIYAR. "MATHEMATICAL MODELING OF BLOOD FLOW THROUGH STENOSED TUBE." Journal of Mechanics in Medicine and Biology 08, no. 01 (2008): 27–32. http://dx.doi.org/10.1142/s0219519408002486.

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In the present study, blood flow in a stenosed tube is modeled. Blood is assumed to be represented by couple stress fluid. The growth projects into the lumen of the artery and blood flow is disturbed; thus, a potential coupling develops between the growth and the blood flow through the artery. An analysis of the effect of an axially symmetric growth into the lumen of a tube of constant cross-section through which a Newtonian fluid is steadily flowing is presented. The importance of the effect of slip velocity in stenosed tube is highlighted.

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20

Saleem, Najma, and Sufian Munawar. "A mathematical analysis of MHD blood flow of Eyring–Powell fluid through a constricted artery." International Journal of Biomathematics 09, no. 02 (2016): 1650027. http://dx.doi.org/10.1142/s1793524516500273.

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The present study deals with the flow of blood through a stenotic artery in the presence of a uniform magnetic field. Different flow situations are taken into account by considering the regular and irregular shapes of stenosis lying inside the walls of artery. Blood inside the artery is assumed to be Eyring–Powell fluid. A mathematical model is developed and simplified under the physical assumptions of stenosis. The regular perturbation method is adopted to find the solutions for axial velocity and pressure gradient. The variations in pressure drop across the stenosis length, the impedance and

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SALEEM, NAJMA, T. HAYAT, and A. ALSAEDI. "A HYDROMAGNETIC MATHEMATICAL MODEL FOR BLOOD FLOW OF CARREAU FLUID." International Journal of Biomathematics 07, no. 01 (2014): 1450010. http://dx.doi.org/10.1142/s1793524514500107.

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This paper constructs a mathematical model for blood flow through an artery with mild stenosis. Constitutive equations for Carreau fluid are employed in the mathematical modeling. Analysis has been carried out in the presence of constant magnetic field. Symmetric and asymmetric shapes of stenosis are taken. Governing flow model is computed for the series solution. The flow quantities of interest, for instance, axial velocity, pressure gradient, pressure drop, impedance and shear stress at the walls of stenotic artery are described for various pertinent parameters entering into the problem.

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Ahmad, Riaz, Asma Farooqi, Jiazhong Zhang, and Nasir Ali. "Steady flow of a power law fluid through a tapered non-symmetric stenotic tube." Applied Mathematics and Nonlinear Sciences 4, no. 1 (2019): 255–66. http://dx.doi.org/10.2478/amns.2019.1.00022.

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AbstractA steady flow of a power law fluid through an artery with a stenosis has been analyzed. The equation governing the flow is derived under the assumption of mild stenosis. An exact solution of the governing equation is obtained, which is then used to study the effects of various parameters of interest on axial velocity, resistance to flow and shear stress distribution. It is found that axial velocity increases while resistance to flow decreases when going from shear-thinning to shear-thickening fluid. Moreover, the magnitude of shear stress decreases by increasing the tapering parameter.

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Mohajan, Devajit, and Haradhan Kumar Mohajan. "A Mathematical Modeling of Newtonian Blood Flow Through Arterial Mild Stenosis." Innovation in Science and Technology 3, no. 6 (2024): 12–22. https://doi.org/10.56397/ist.2024.11.02.

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Mathematical models in health science are usually used to study the blood flow behaviors into the artery. The blood flow through the artery is modeled as an incompressible and homogenous Newtonian fluid, and the flow is assumed to be steady and laminar. Stenosis is an abnormal narrowing in arteries for excess fat deposition that restricts the normal pattern of blood flow through arteries and may cause a heart attack. It is evident that the stenosis in artery may develop due to the accumulation of fat, cholesterol, and abnormal intravascular growth of tissue. The stenosis is to be symmetric abo

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Chakraborty, Uday Shankar, Devajyoti Biswas, and Moumita Paul. "Suspension model blood flow through an inclined tube with an axially non-symmetrical stenosis." Korea-Australia Rheology Journal 23, no. 1 (2011): 25–32. http://dx.doi.org/10.1007/s13367-011-0004-8.

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Dash, Nibedita, and Sarita Singh. "Analytical Study of Non-Newtonian Reiner–Rivlin Model for Blood flow through Tapered Stenotic Artery." Mathematical Biology and Bioinformatics 15, no. 2 (2020): 295–312. http://dx.doi.org/10.17537/2020.15.295.

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Stenosis, the abnormal narrowing of artery, significantly affects dynamics of blood flow due to increasing resistance to flow of blood. Velocity of blood flow, arterial pressure distribution, wall shear stress and resistance impedance factors are altered at different degree of stenosis. Prior knowledge of flow parameters such as velocity, flow rate, pressure drop in diseased artery is acknowledged to be crucial for preventive and curative medical intervention. The present paper develops the solution of Navier–Stokes equations for conservation of mass and momentum for axis-symmetric steady stat

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RIAHI, DANIEL N., and RANADHIR ROY. "UNSTEADY BLOOD FLOW IN AN ARTERY WITH AN OVERLAPPING STENOSIS." International Journal of Applied Mechanics 04, no. 02 (2012): 1250016. http://dx.doi.org/10.1142/s1758825112500160.

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We consider the problem of unsteady blood flow in an artery and in the presence of an overlapping symmetric stenosis. The blood flow in the arterial tube is assumed to be a suspension of red cells in plasma. The present formulation makes use of the variable fluid viscosity modeling that takes into account the amount of the red cells in the blood fluid flow system. Using both analytical and computational methods, we determine the expression for various quantities such as the leading order flow velocity, pressure gradient, impedance and shear stress at the throats and at the critical height, and

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SARIFUDDIN, SANTABRATA CHAKRAVARTY, and PRASHANTA KUMAR MANDAL. "EFFECT OF ASYMMETRY AND ROUGHNESS OF STENOSIS ON NON-NEWTONIAN FLOW PAST AN ARTERIAL SEGMENT." International Journal of Computational Methods 06, no. 03 (2009): 361–88. http://dx.doi.org/10.1142/s0219876209001887.

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Numerical investigations of non-Newtonian blood flow are carried out through an asymmetric arterial constriction (stenosis) obtained from casting of mildly stenosed artery [Back et al. [1984] Effect of mild atherosclerosis on flow resistance in a coronary artery casting by man, J. Biomech. Eng., Trans. ASME106, 48]. The Marker and Cell method, for governing equations of motion for the flow in primitive variables formulations is developed in a staggered grid to discretize the momentum equations representing the non-Newtonian viscous incompressible flow characterized by the generalized Power-law

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Yang, Nathaniel. "Congenital Internal Auditory Canal Stenosis." Philippine Journal of Otolaryngology Head and Neck Surgery 39, no. 2 (2024): 57. http://dx.doi.org/10.32412/pjohns.v39i2.2445.

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A 3-year-old boy underwent evaluation for possible cochlear implantation. He had failed a neonatal otoacoustic emission (OAE) hearing screen. A combined auditory brainstem response/auditory steady-state response (ABR/ASSR) test battery confirmed the presence of a severe hearing loss on the right and a profound hearing loss on the left. No Joint Committee on Infant Hearing (JCIH) risk factors for early childhood hearing loss1 were identified. Rehabilitation via hearing aid amplification and auditory-verbal speech therapy was unsuccessful. Computerized tomographic (CT) imaging of the temporal bo

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VÉTEL, J., A. GARON, D. PELLETIER, and M. I. FARINAS. "Asymmetry and transition to turbulence in a smooth axisymmetric constriction." Journal of Fluid Mechanics 607 (June 30, 2008): 351–86. http://dx.doi.org/10.1017/s0022112008002188.

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The flow through a smooth axisymmetric constriction (a stenosis in medical applications) of 75% restriction in area is measured using stereoscopic and time-resolved particle image velocimetry (PIV) in the Reynolds number range Re ~ 100–1100. At low Reynolds numbers, steady flow results reveal an asymmetry of the flow downstream of the constriction. The jet emanating from the throat of the nozzle is deflected towards the wall causing the formation of a one-sided recirculation region. The asymmetry results from a Coanda-type wall attachment already observed in symmetric planar sudden expansion f

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Golshirazi, Amir Hossain, and Vahid Javanbakht. "Effects of Anastomotic Angles and Distances of the Bypass Graft to the Stenosis on Blood Flow Hydrodynamics in a Bypass Grafting Coronary Artery." Journal of Clinical Cardiology 3, no. 2 (2023): 60–70. http://dx.doi.org/10.33696/cardiology.2.036.

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It is believed that the proper distance between the grafting location and the stenosis location and the appropriate angle of graft or transplantation in the blocked artery of the heart are two important factors in the removal or decrease of reappearance and re-development of intimal hyperplasia (IH), blood clotting, and re-blockage of the surgical artery. In the present study, a 3-D geometry of the host coronary artery as non-elastic with 75% symmetric axial cross-sectional area reduction is considered. The main assumptions were incompressible, laminar, steady-state, Newtonian, and non-Newtoni

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Sundström, Elias, and Marco Laudato. "Machine Learning-Based Segmentation of the Thoracic Aorta with Congenital Valve Disease Using MRI." Bioengineering 10, no. 10 (2023): 1216. http://dx.doi.org/10.3390/bioengineering10101216.

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Subjects with bicuspid aortic valves (BAV) are at risk of developing valve dysfunction and need regular clinical imaging surveillance. Management of BAV involves manual and time-consuming segmentation of the aorta for assessing left ventricular function, jet velocity, gradient, shear stress, and valve area with aortic valve stenosis. This paper aims to employ machine learning-based (ML) segmentation as a potential for improved BAV assessment and reducing manual bias. The focus is on quantifying the relationship between valve morphology and vortical structures, and analyzing how valve morpholog

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Stephen, Samuel, Barbara Johnston, and Peter Johnston. "Comparing lattice Boltzmann simulations of periodic fluid flow in repeated micropore structures with longitudinal symmetry and asymmetry." ANZIAM Journal 63 (June 21, 2022): C69—C83. http://dx.doi.org/10.21914/anziamj.v63.17158.

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Pumping of a particulate suspension back and forth through a membrane of periodic axisymmetric pores results in no net flow of the fluid; however, the particles are transported along the pores from one side of the membrane to the other. The movement of the particles is dependent on the geometry of the pore walls. Current simulations for this problem utilise standard computational fluid dynamics techniques (e.g. finite element method, boundary element method). However, there are difficulties associated with applying these techniques to this problem, such as the requirement of many spatial perio

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Akbar, Noreen Sher, M. Bilal Habib, Maimona Rafiq, Taseer Muhammad, and Metib Alghamdi. "Biological structural study of emerging shaped nanoparticles for the blood flow in diverging tapered stenosed arteries to see their application in drug delivery." Scientific Reports 14, no. 1 (2024). http://dx.doi.org/10.1038/s41598-024-51848-4.

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AbstractThe magnetic force effects and differently shaped nano-particles in diverging tapering arteries having stenoses are being studied in current research via blood flow model. There hasn’t been any research done on using metallic nanoparticles of different shapes with water as the base fluid. A radially symmetric but axially non-symmetric stenosis is used to depict the blood flow. Another significant aspect of our research is the study of symmetrical distribution of wall shearing stresses in connection with resistive impedance, as well as the rise of these quantities with the progression o

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Rupesh, K. Srivastav. "Two-Layered Model of blood flow through arterial catheterization with non-symmetric constriction." J. of Computation In Biosciences And Engineering Volume 2, Issue 2 (2015). https://doi.org/10.5281/zenodo.898009.

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In this paper flow of blood through a narrow catheterized artery with axially non-symmetrical stenosis has been investigated. Flowing blood has been represented by a two-layered model consisting of a core region of suspension of all the erythrocyte assumed to be a particle-fluid suspension (i.e., a suspension of all erythrocyte in plasma) and a peripheral layer of plasma (Newtonian fluid). The expression for the flow characteristics, namely the impedance, the wall shear stress, the shear stress at stenosis throat has been derived. The extensive quantitative analysis is performed through numeri

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Onitilo, Sefiu, Mustapha Usman, and Deborah Daniel. "Effects of Hematocrit on Blood Flow Through A Stenosed Human Carotid Artery." Iraqi Journal of Science, August 28, 2020, 2106–14. http://dx.doi.org/10.24996/ijs.2020.61.8.25.

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In this paper, the effects of hematocrit of red blood cells on blood flow through a stenosed human carotid artery was considered by taking blood as a Newtonian fluid. The governing equations on blood flow were derived. The mathematical content involved in the equations are the variables of interest such as number of stenosis , percentage of hematocrit of red blood cells in the blood, flow rate, wall shear stress, and viscosity of the blood. Guided by medical data collected on the constraint of blood flow in stenosed human carotid arteries, the governing equations were used to check the effects

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Owasit, Pinyo, and Somchai Sriyab. "Mathematical modeling of non-Newtonian fluid in arterial blood flow through various stenoses." Advances in Difference Equations 2021, no. 1 (2021). http://dx.doi.org/10.1186/s13662-021-03492-9.

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AbstractSince the stenosis geometry of some cardiovascular patients cannot be described by a vertically symmetric function throughout the stenosis, so it motivates us to study the blood flow through a vertically asymmetric stenosis. In addition, we compare the flow quantities in bothvertically symmetric and asymmetric stenoses. The vertically symmetric stenosis is explained by a vertically symmetric function such as an exponential function in bell shape and a cosine function in cosine shape. The vertically asymmetric stenosis is interpreted by a vertically asymmetric function such as the combi

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Akbar, Noreen Sher, Maimona Rafiq, Taseer Muhammad, and Metib Alghamdi. "Propulsive study of blood flow with heat transfer enhancement connection to ferro copper magnetized nanoparticles in converging tapered stenosed arterial surface." International Journal of Modern Physics B, May 17, 2024. http://dx.doi.org/10.1142/s0217979225500559.

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To investigate the effects of magnetic fields and variously structured nanoparticles in narrowing, stenosed arteries, an arterial flow model is incorporated. The aim of this study here is to achieve more realistic results by modeling and simulating the arterial blood flow system with the nanoparticles and shape factor of the nanoparticles. The study of blood flow in tapered stenosed arteries with nanoparticles involves understanding the dynamics of blood circulation in vessels having application in drug delivery. Nanoparticles with specific shape factors can enhance imaging modalities like MRI

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Karri, Satyaprakash, and Pavlos P. Vlachos. "Time-Resolved DPIV Investigation of Pulsatile Flow in Symmetric Stenotic Arteries—Effects of Phase Angle." Journal of Biomechanical Engineering 132, no. 3 (2010). http://dx.doi.org/10.1115/1.4000934.

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The effect of phase angle between pressure and flow waveforms on the flow characteristics in stenosed compliant vessels for coronary (phase angle (PA) of approximately −225 deg) and peripheral flows (PA of approximately −45 deg) is investigated using time resolved digital particle image velocimetry. Synthetic arteries with 50% and 75% stenosis at various physiological conditions with Reynolds numbers (Re) of 250, 350, and 450 and corresponding Womersley parameter (α) of 2.7, 3.2, and 3.7 were studied; wall-shear stresses (WSSs), oscillatory shear index (OSI), and recirculation lengths were det

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Das, Siddhartha Sankar, and Chandi Sasmal. "Exploring improved hemodynamics in a stenosed artery using a two-phase Eulerian-granular blood model." Physics of Fluids 37, no. 3 (2025). https://doi.org/10.1063/5.0260485.

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Understanding the motion of red blood cells (RBCs) in stenosed blood vessels is critical for advancing knowledge of cardiovascular diseases such as atherosclerosis. This study employs a two-phase Eulerian-granular model to investigate hemodynamics in arteries with varying degrees of stenosis (DOS). By incorporating kinetic theory to account for RBC particle mechanics, the present model provides better predictive capabilities compared to single-phase Newtonian, non-Newtonian, and two-phase Euler–Euler models, showing better agreement with experimental data for straight arteries (0% DOS). The fi

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Fahim, Muhammad, Muhammad Sajid, Nasir Ali, and Muhammad Noveel Sadiq. "Heat and mass diffusion to Williamson fluid streaming through a tube with multiple stenoses while subjected to periodic body acceleration." Mathematical Modelling of Natural Phenomena, June 30, 2023. http://dx.doi.org/10.1051/mmnp/2023021.

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This article examines a mathematical framework that describes the versatile behavior of heat and mass exchange in blood flowing through a narrowed vessel having multiple stenoses. The geometry of a channel having multiple stenoses with an asymmetrical axial axis and a symmetrical radial axis can be visualized by applying a suitable mathematical expression. The geometry of the chosen model considers the height and shape of stenoses. The modification in shape parameter is used to capture variations in the shape of the stenoses in the artery. The blood is supposed to be isochoric (incompressible)

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Manzoori, Amirhosein, Famida Fallah, Mohammadali Sharzehee, and Sina Ebrahimi. "Computational Investigation of the Stability of Stenotic Carotid Artery under Pulsatile Blood Flow Using a Fluid-Structure Interaction Approach." International Journal of Applied Mechanics, December 30, 2020, 2050110. http://dx.doi.org/10.1142/s1758825120501100.

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Stenosis can disrupt the normal pattern of blood flow and make the artery more susceptible to buckling which may cause arterial tortuosity. Although the stability simulations of the atherosclerotic arteries were conducted based on solid modeling and static internal pressure, the mechanical stability of stenotic artery under pulsatile blood flow remains unclear while pulsatile nature of blood flow makes the artery more critical for stresses and stability. In this study, the effect of stenosis on arterial stability under pulsatile blood flow was investigated. Fluid–structure interaction (FSI) si

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Hasan, Mahmudul, David A. Rubenstein, and Wei Yin. "Effects of Cyclic Motion on Coronary Blood Flow." Journal of Biomechanical Engineering 135, no. 12 (2013). http://dx.doi.org/10.1115/1.4025335.

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The goal of this study was to establish a computational fluid dynamics model to investigate the effect of cyclic motion (i.e., bending and stretching) on coronary blood flow. The three-dimensional (3D) geometry of a 50-mm section of the left anterior descending artery (normal or with a 60% stenosis) was constructed based on anatomical studies. To describe the bending motion of the blood vessel wall, arbitrary Lagrangian–Eularian methods were used. To simulate artery bending and blood pressure change induced stretching, the arterial wall was modeled as an anisotropic nonlinear elastic solid usi

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Guo, Yin, Ebru Y. Akcicek, Daniel S. Hippe, et al. "Abstract TP143: Longitudinal Evaluation of Vessel Wall MRI Demonstrates Bilaterally Symmetric Evolution of Carotid Atherosclerosis." Stroke 55, Suppl_1 (2024). http://dx.doi.org/10.1161/str.55.suppl_1.tp143.

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Introduction: Carotid atherosclerosis is a leading cause of stroke worldwide. Previous studies demonstrated bilateral symmetry in atherosclerotic plaque burden and calcification scores. By leveraging longitudinal 3D vessel wall MRI, this study aims to investigate if there is a symmetrical trend of bilateral plaque progression. Methods: Asymptomatic patients with confirmed carotid stenosis were prospectively recruited in the study. Subjects underwent baseline and follow-up 3D vessel wall imaging for a time span up to 8 years. A deep learning-based pipeline was used to bilaterally segment the ca

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Dell‘Como, M., N. Bier, G. Carreras, et al. "P174 WELLENS‘ SYNDROME: A TYPICAL CASE." European Heart Journal Supplements 24, Supplement_C (2022). http://dx.doi.org/10.1093/eurheartj/suac012.166.

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Abstract 78–year–old man, hypertensive, diabetic, dyslipidemic, with a recent diagnosis of chronic ischemic encephalopathy and cognitive impairment that severely limited the acquisition of both proximate and remote pathological anamnesis.Transported to the emergency room from 118, contacted by family members, due to pain in the left arm associated with cold sweating and general malaise, symptoms lasting about 4 hours and no longer present upon arrival in the emergency room.On the Echocardiogram performed in ER: akinesia of the apex in its entirety and of the middle anterior wall, not present i

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