Temat: tętnica - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Visco-elastic fluid model in an inclined porous stenosed artery with slip effect and body acceleration
Autorzy:: Manisha, Rana
Kumar, Surendra
Powiązania:: https://bibliotekanauki.pl/articles/27312399.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: poślizg
przepuszczalność
tętnica
visco-elastic fluid
slip condition
inclined porous artery
permeability
body acceleration
Opis:: The present paper analyzes an unsteady magnetohydrodynamic blood flow model of an visco-elastic fluid through an inclined porous stenosed artery with body acceleration and slip effect. Navier-Stokes equations have been used to describe the blood flow model. The governing equation of blood flow is solved by an analytic method by considering blood as an incompressible, visco-elastic fluid, and suspension of RBC’s in plasma. Axial velocity, blood acceleration, flow rate, and shear stress are derived numerically by using the finite Laplace and Hankel transformation and their inverse. The effect of parameters such as the visco-elasticity parameter, Womersley number, Hartmann number, inclination angle, parameter of slip, and body acceleration frequency is analyzed. Axial velocity reduces as the Hartmann number and visco-elasticity parameter enhance and it enhances with the enhancement of the slip parameter and inclination angle. The study is beneficial for finding the effect of slip parameter, porosity factor and Hartmann number when a human body is exposed to MRI and CT scan.
Źródło:: International Journal of Applied Mechanics and Engineering; 2022, 27, 4; 82--104
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Ex vivo and in silico study of human Common Carotid Arteries pressure response in physiological and inverted state
Autorzy:: Piechna, A.
Cieślicki, K.
Lombarski, L.
Ciszek, B.
Powiązania:: https://bibliotekanauki.pl/articles/265143.pdf
Data publikacji:: 2015
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: artery mechanics
residual stress
pressure-inflation test
common carotid artery
tętnica szyjna
metoda elementów skończonych
symulacja komputerowa
Opis:: Arterial walls are a multilayer structures with nonlinear material characteristics. Furthermore, residua stresses exist in unloaded state (zero-pressure condition) and they affect arterial behavior. To investigate these phenomena a number of theoretical and numerical studies were performed, however no experimental validation was proposed and realized yet. We cannot get rid of residual stresses without damaging the arterial segment. In this paper we propose a novel experiment to validate a numerical model of artery with residual stresses. The inspiration for our study originates from experiments made by Dobrin on dogs’ arteries (1999). We applied the idea of turning the artery inside out. After such an operation the sequence of layer is reversed and the residual stresses are re-ordered. We performed several pressure-inflation tests on human Common Carotid Arteries (CCA) in normal and inverted configurations. The nonlinear responses of arterial behavior were obtained and compared to the numerical model. Computer simulations were carried out using the commercial software which applied the finite element method (FEM). Then, these results were discussed.
Źródło:: International Journal of Applied Mechanics and Engineering; 2015, 20, 1; 209-214
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Reversed Robin Hood syndrome in the light of nonlinear model of cerebral circulation
Autorzy:: Piechna, A.
Cieslicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/264358.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: cerebral blood flow
autoregulation
steal syndrome
circle of Willis
Computational Fluid Dynamics (CFD)
autoregulacja
przepływ krwi w mózgu
tętnica
Opis:: The brain is supplied by the internal carotid and vertebro-basilar systems of vessels interconnected by arterial anastomoses and forming at the base of the brain a structure called the Circle of Willis (CoW). An active intrinsic ability of cerebral vascular bed maintains constant Cerebral Blood Flow (CBF) in a certain range of systemic pressure changes. This ability is called autoregulation and together with the redundant structure of the CoW guarantee maintaining CBF even in partial occlusion of supplying arteries. However, there are some situations when the combination of those two mechanisms causes an opposite effect called the Reversed Robin Hood Syndrome (RRHS). In this work we proposed a model of the CoW with autoregulation mechanism and investigated a RRHS which may occur in the case of Internal Carotid Artery (ICA) stenosis combined with hypercapnia. We showed and analyzed the mechanism of stealing the blood by the contralateral side of the brain. Our results were qualitatively compared with the clinical reports available in the literature.
Źródło:: International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 459-464
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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