用流体双折射方法研究人工心脏瓣膜的脉动流场  

A Study of the Pulsatile Flow Field around Artificial Heart Valves Model by Flow Birefringence Technique

作　　者：胡艳艳[1] 宋红深[1] 孙永达[1] 

机构地区：[1]天津大学,300072

出　　处：《实验力学》2004年第1期24-28,共5页Journal of Experimental Mechanics

摘　　要：本文选用1.5%的MillingYellow溶液,在对二维心瓣低频脉动流场的分析中,仍采用稳态流场的线性光-力学关系。通过摄象机记录下了一个脉动周期内脉动流量Q从36升/小时至55升/小时流场的变化情况,直观地看到主动脉瓣流场中最大切变率的瞬态分布。记录了同一模型在相同条件下稳态流场流量Q为50升/小时的流场,对两种流场下几个典型截面处的最大切变率的数值做了比较。通过对图线的分析,表明在稳态流量与脉动流量相同的情况下,脉动流场的最大切变率数值高于稳态流场,这就说明脉动使流场的剪切作用增强。This paper presents the analysis of the low frequency pulsatile flow field of two dimention aorta valve model by adopting the linear stress-optic relations in a steady flow field. The model was emerged in 1.5% Milling Yellow solution in the experiment. The changing pulstile flow fields which the pulsatile rate of flow Q changed from 36 liter per hour to 55 liter per hour were recorded by camera in a pulsatile cycle. The instantaneous distribution of the maximum strain rate in the aorta valve flow field were observed directly. As a comparison, the steady flow field of the same model, which the rate of flow was 50 liter per hour, were also recorded under the same conditions. The maximal strain rates in pulsatile flow field which the rate of flow was 50 liter per hour at several typical sections of the aorta valve model were calculated and were compared with that in the steady flow field. By analysing the diagrams, it was shown that the maximal strain rates in pulsatile flow field were higher than those in the steady flow field at the same instantaneous rate of flow, which implies that pulsation makes the shear stress stronger.

关 键 词：流体双折射 稳态流场 人工心瓣模型 脉动流场 生物力学 流体力学 

分 类 号：Q66[生物学—生物物理学] O35[理学—流体力学]