Title :
Non Newtonian flow study in an axisymmetric tube stenosis
Author :
Zissis, J.A. ; Mathioulakis, D.S.
Author_Institution :
Sch. of Mech. Eng., Nat. Tech. Univ. of Athens, Athens, Greece
Abstract :
The flow behavior of four non newtonian shear thinning fluids, namely Walburn-Schneck, Herschel-Bulkley, Quemada and Casson were studied numerically in a straight circular tube as well as in a 75% axisymmetric stenosis under steady and unsteady inlet flow conditions. Reynolds varied from 25 to 150, Strouhal from 0.05 to 1 and Womersley number from 2.8 to 12.53. Comparisons were performed between the models and the Newtonian one. In steady flow cases, the non Newtonian behaviour becomes evident with reducing Re whereas in unsteady cases, the flow patterns are dependent on Re, Str and the fluid model.
Keywords :
blood vessels; computational fluid dynamics; haemodynamics; haemorheology; non-Newtonian fluids; Casson fluid; Herschel-Bulkley fluid; Quemada fluid; Walburn-Schneck fluid; axisymmetric tube stenosis; blood flow; flow behavior; flow patterns; inlet flow conditions; non Newtonian flow study; shear thinning fluids; straight circular tube;
Conference_Titel :
Information Technology and Applications in Biomedicine (ITAB), 2010 10th IEEE International Conference on
Conference_Location :
Corfu
Print_ISBN :
978-1-4244-6559-0
DOI :
10.1109/ITAB.2010.5687665
