ENERGY-LOSSES IN FLOW THROUGH STENOSED VALVES
ENERGY-LOSSES IN FLOW THROUGH STENOSED VALVES
复制标题
DOI：
10.1016/0021-9290(79)90159-3
复制
发表时间：
1979-01-01
影响因子：
2.4
通讯作者：
CLARK, C
中科院分区：
文献类型：
--
作者：
CLARK, C
理论分析给出了非定常流动中机械能损失率的计算公式，包括狭窄的[心脏]瓣膜内和瓣膜下游的湍流混合区。这两个区域的损失可以通过减去入口和出口的机械能项来确定，但它们不能仅通过分析损失机制来明确地获得。然后，这些方程被简化以应用于刚性壁系统，并重新排列，以允许根据已知的流入速率和系统几何形状来预测能量损失率。分析狭窄程度、射流角和狭窄后扩张对血管损伤的影响。理论预测得到了模型研究结果的支持。
A theoretical analysis yields equations for the calculation of rates of mechanical energy loss in unsteady flow, both within a stenosed [heart] valve and in the turbulent mixing region which occurs downstream of the valve. Losses within each of the 2 regions can be determined by subtraction of the mechanical energy terms at inlet and outlet, but they cannot be obtained explicitly by analysis of the loss mechanisms alone. The equations are then simplified for application to a rigid walled system and re-arranged to allow the prediction of energy loss rates based upon known inflow rates and system geometry. The effects upon losses of severity of stenosis, jet angle and post-stenotic dilatation were analyzed. The theoretical predictions are supported by results from a model study.