scholarly journals The Influence of Non-Newtonian Model on Properties of Blood Flow Through a Left Coronary Artery with Presence of Different Double Stenosis

2021 ◽  
Vol 39 (3) ◽  
pp. 895-905
Author(s):  
Saleem K. Kadhim ◽  
Mohammed G. Al-Azawy ◽  
Sinan Abdul-Ghafar Ali ◽  
Mina Qays Kadhim
Keyword(s):  
Blood Flow ◽  
Coronary Artery ◽  
Left Coronary Artery ◽  
Calculated Data ◽  
Shear Stresses ◽  
Numerical Investigations ◽  
Newtonian Model ◽  
Flow Through ◽  
Wall Shear ◽  
Flow States

Cardiovascular diseases were the main cause for loosing lives in the last decades due to the restricted blood flow states in the blood vessels areas. Numerical investigations have been conducted as the aim of this work to examine the blood flow, and wall shear stresses adjacent to the mono stenosis up to different degrees involved in the main, side and distal main branches as well as observe the pulsatile flow of blood in the left coronary artery through various percentage of stenosis. Both the Carreau non-Newtonian rheological model and the Newtonian model were utilized to model the blood fluid and wall shear stresses of left coronary artery, in a row, all the calculated data were validated with the previously published papers. It was found that the blood flow inside areas of the artery lie within the range of non-Newtonian rheological effects can be present, verifying the need to treat blood as non-Newtonian fluid; especially, with the case of 90% blockage.

The influence of multi-stenosis in the left coronary artery subjected to the variable blood flow rate

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sarfaraz Kamangar ◽  
N. Ameer Ahamad ◽  
N. Nik-Ghazali ◽  
Ali E. Anqi ◽  
Ali Algahtani ◽  
...  
Keyword(s):  
Blood Flow ◽  
Coronary Artery ◽  
Flow Rate ◽  
Left Coronary Artery ◽  
Upstream Region ◽  
Recirculation Region ◽  
Patient Specific ◽  
Shear Stresses ◽  
Content Type ◽  
Wall Shear

PurposeCoronary artery disease (CAD) is reported as one of the most common sources of death all over the world. The presence of stenosis (plaque) in the coronary arteries results in the restriction of blood supply, leading to myocardial infarction. The current study investigates the influence of multi stenosis on hemodynamic properties in a patient-specific left coronary artery.Design/methodology/approachA three-dimensional model of the patient-specific left coronary artery was reconstructed based on computed tomography (CT) scan images using MIMICS-20 software. The diseased model of the left coronary artery was investigated, having the narrowing of 90% and 70% of area stenosis (AS) at the left anterior descending (LAD) and left circumflex (LCX), respectively.FindingsThe results indicate that the upstream region of stenosis experiences very high pressure for 90% AS during the systolic period of the cardiac cycle. The pressure drops maximum as the flow travels into the stenotic zone, and the high flow velocities were observed across the 90% AS. The higher wall shear stresses occur at the stenosis region, and it increases with the increase in the flow rate. It is found that the maximum wall shear stress across 90% AS is at the highest risk for rupture. A recirculation region immediately after the stenosis results in the further development of stenosis.Originality/valueThe current study provides evidence that there is a strong effect of multi-stenosis on the blood flow in the left coronary artery.

scholarly journals Numerical Simulation of Dispersed Particle-Blood Flow in the Stenosed Coronary Arteries

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Mongkol Kaewbumrung ◽  
Somsak Orankitjaroen ◽  
Pichit Boonkrong ◽  
Buraskorn Nuntadilok ◽  
Benchawan Wiwatanapataphee
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Shear Stress ◽  
Coronary Artery ◽  
Pressure Drop ◽  
Wall Shear Stress ◽  
Stokes Equations ◽  
Spherical Shape ◽  
Shear Stresses ◽  
Wall Shear

A mathematical model of dispersed bioparticle-blood flow through the stenosed coronary artery under the pulsatile boundary conditions is proposed. Blood is assumed to be an incompressible non-Newtonian fluid and its flow is considered as turbulence described by the Reynolds-averaged Navier-Stokes equations. Bioparticles are assumed to be spherical shape with the same density as blood, and their translation and rotational motions are governed by Newtonian equations. Impact of particle movement on the blood velocity, the pressure distribution, and the wall shear stress distribution in three different severity degrees of stenosis including 25%, 50%, and 75% are investigated through the numerical simulation using ANSYS 18.2. Increasing degree of stenosis severity results in higher values of the pressure drop and wall shear stresses. The higher level of bioparticle motion directly varies with the pressure drop and wall shear stress. The area of coronary artery with higher density of bioparticles also presents the higher wall shear stress.

NUMERICAL SIMULATION OF TRANSIENT BLOOD FLOW THROUGH THE LEFT CORONARY ARTERY WITH VARYING DEGREES OF BIFURCATION ANGLES

2017 ◽  
Vol 17 (01) ◽  
pp. 1750005
Author(s):  
BO ZHANG ◽  
YILUN JIN ◽  
XIAORAN WANG ◽  
TAISHENG ZENG ◽  
LIANSHENG WANG
Keyword(s):  
Blood Flow ◽  
Coronary Artery ◽  
Left Coronary Artery ◽  
Vascular System ◽  
Abdominal Aortic ◽  
Analysis Technique ◽  
Common Technique ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Through ◽  
The Relationship

Atherosclerosis is a cardiovascular condition that can occur in any part of the vascular system. Especially, it can exist in bifurcated arteries such as the left and right coronary arteries, abdominal aortic bifurcation or carotid artery bifurcation. In our study, we examine the left coronary artery as an exemplification using wall shear stress (WSS) and wall pressure gradient (WPG). Then, we attempt to find the relationship between bifurcated arterial geometry and hemodynamics. Computational fluid dynamics (CFD) is a common technique applied to characterize blood flow accurately and assist us to gain an insight of atherosclerosis. In this paper, we used CFD as the computational hemodynamics analysis technique to examine flow through the left coronary artery that has variable angular bifurcation. Our results demonstrated that the region of low WSS area and magnitudes of maximum WPG increases with the angles of bifurcation. Such hemodynamic condition resulting from the large bifurcation angles has an effect on atherogenesis and is worthy of investigation for better understanding of atherosclerosis.

BLOOD FLOW IN THE CIRCUMFLEX BRANCH OF THE LEFT CORONARY ARTERY OF THE INTACT DOG

1936 ◽  
Vol 117 (2) ◽  
pp. 271-279 ◽  
Author(s):  
Hiram E. Essex ◽  
J. F. Herrick ◽  
Edward J. Baldes ◽  
Frank C. Mann
Keyword(s):  
Blood Flow ◽  
Coronary Artery ◽  
Left Coronary Artery
Sign in / Sign up

Export Citation Format

Share Document