用电化学方法测试动脉模型壁面剪应力

A Study on the Wall Shear Stress of Artery Model by Using Electrochemical Measuring Technique

应用电化学方法 ,对动脉模型 T形分叉部位流场壁面剪应力进行测试研究。测试了对于现有理论分析和数值计算都比较困难的高雷诺数 ( RE=1 0 0 0 - 2 0 0 0 )流动流场的壁面剪应力 ,并且对若干不同雷诺数及不同支管分流情况进行了系列测试。通过实验发现 ,此部位同时存在高剪应力区和低剪应力区 ,确定了它们的位置和剪应力的大小。系列测试还显示 :随着雷诺数的变化 ,无量纲剪应力有一定的变化 ;而当支管分流变化时 ,无量纲剪应力的变化很明显。

In this paper, we attempt to study the wall shear stress in the flow field of a T bifurcation section of an artery model by using an electrochemical measuring technique. We measure the wall shear stresses in the case of relatively high Reynolds numbers (Re=1000 2000) which are difficult to obtain through theoretical analyses and numerical calculations. We conduct systematic measurements of wall shear stresses for different Reynolds numbers and different flow ratios. According to the experiments, it is found that there exists both high and low shear stress regions and the locations of these regions, and the values of wall shear stresses are determined. It is shown from a series of tests that the dimensionless relative values of wall shear stresses change a little with the Reynolds numbers, but change substantially with the flow ratios.