The influence of the non-Newtonian properties of blood on the flow in large arteries:: unsteady flow in a 90° curved tube

被引:265
作者
Gijsen, FJH [1 ]
Allanic, E [1 ]
van de Vosse, FN [1 ]
Janssen, JD [1 ]
机构
[1] Eindhoven Univ Technol, Dept Mech Engn, NL-5600 MB Eindhoven, Netherlands
关键词
non-Newtonian flow; 90 degrees curved tube; LDA experiment; FEM simulation;
D O I
10.1016/S0021-9290(99)00014-7
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
A numerical and experimental investigation of unsteady entry flow in a 90 degrees curved tube is presented to study the impact of the non-Newtonian properties of blood on the velocity distribution. The time-dependent flow rate for the Newtonian and the non-Newtonian blood analog fluid were identical. For the numerical computation, a Carreau-Yasuda model was employed to accommodate the shear thinning behavior of the Xanthan gum solution. The viscoelastic properties were not taken into account. The experimental results indicate that significant differences between the Newtonian and non-Newtonian fluid are present. The numerical results for both the Newtonian and the non-Newtonian fluid agree well with the experimental results. Since viscoelasticity was not included in the numerical code, shear thinning behavior of the blood analog fluid seems to be the dominant non-Newtonian property, even under unsteady flow conditions. Finally, a comparison between the non-Newtonian fluid model and a Newtonian fluid at a rescaled Reynolds number is presented. The rescaled Reynolds number, based on a characteristic rather than the high-shear rate viscosity of the Xanthan gum solution, was about three times as low as the original Reynolds number. Comparison reveals that the character of how of the non-Newtonian fluid is simulated quite well by using the appropriate Reynolds number. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:705 / 713
页数:9
相关论文
共 39 条
[11]  
Clegg D.B., 1963, APPL SCI RES A, V12, P199
[12]  
Cokelet G.R., 1972, BIOMECHANICS ITS FDN
[13]   FLOW OF A BINGHAM FLUID IN A SLIGHTLY CURVED TUBE [J].
DAS, BY .
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE, 1992, 30 (09) :1193-1207
[14]  
Dean WR, 1928, PHILOS MAG, V5, P673
[15]  
Dean WR, 1927, PHILOS MAG, V4, P208
[16]  
GIJSEN F, 1998, THESIS EINDHOVEN U T
[17]   A new method to determine wall shear stress distribution [J].
Gijsen, FJH ;
Goijaerts, A ;
vandeVosse, FN ;
Janssen, JD .
JOURNAL OF RHEOLOGY, 1997, 41 (05) :995-1006
[18]  
Hocks APG, 1995, J VASC INVEST, V1, P108
[19]   UNSTEADY ELASTICOVISCOUS FLOW IN A CURVED PIPE [J].
JAMES, PW .
RHEOLOGICA ACTA, 1975, 14 (08) :679-687
[20]  
Jones J.R., 1960, Q. J. Mech. Appl. Math, V13, P428, DOI DOI 10.1093/QJMAM/13.4.429