Spatial variations in shear stress in a 3-D bifurcation model at low Reynolds numbers
Spatial variations in shear stress in a 3-D bifurcation model at low Reynolds numbers
复制标题
DOI：
10.1007/s10439-005-6542-9
复制
发表时间：
2005-10-01
影响因子：
3.8
通讯作者：
Hsiai, TH
中科院分区：
文献类型：
--
作者：
Rouhanizadeh, M;Lin, TC;Hsiai, TH
壁面切应力随时间和空间的变化而变化，难以实时精确监测。微机电系统传感器提供高空间分辨率，以解决小尺度血液动力学的3-D分叉模型中的剪切应力变化。在低雷诺数从1.34到6.7的表面摩擦系数（C-f）周向变化的两个或更多的分叉内的一个因素。在雷诺数为6.7时，沿沿着270度平面的分叉侧壁处的C-f值为7.1，对应于0.0061 dyn/cm（2）的剪切应力值。沿着180度平面，C-f为13或0.0079 dyn/cm（2），在内侧壁沿着90度平面，C-f为10.3或0.0091 dyn/cm（2）。实验表面摩擦系数与Navier-Stokes解的值相关。
Real-time wall shear stress is difficult to monitor precisely because it varies in space and time. Microelectromechanical systems sensor provides high spatial resolution to resolve variations in shear stress in a 3-D bifurcation model for small-scaled hemodynamics. At low Reynolds numbers from 1.34 to 6.7 skin friction coefficients (C-f) varied circumferentially by a factor of two or more within the bifurcation. At a Reynolds number of 6.7, the C-f value at the lateral wall of the bifurcation along the 270 degrees plane was 7.1, corresponding to a shear stress value of 0.0061 dyn/cm(2). Along the 180 degrees plane, C-f was 13 or 0.0079 dyn/cm(2), and at the medial wall along the 90 degrees plane, C-f was 10.3 or 0.0091 dyn/cm(2). The experimental skin friction coefficients correlated with values derived from the Navier-Stokes solutions.