Diebold B, Delouche A, Dumée P, Guglielmi J P, Delouche P, Péronneau P
Unité INSERM 256, Hopital Broussais, Paris, France.
J Biomech. 1990;23(1):35-44. doi: 10.1016/0021-9290(90)90367-c.
In order to provide physical information supporting the clinical use of flow mapping, an in vitro model was designed to measure the velocity fields in a pulsatile hydraulic turbulent jet. We used a peak velocity ranging from 2.5 to 5.5 m.s-1, an orifice diameter ranging from 5.8 to 11.3 mm and confined the jet in a receiving tube whose diameter ranged from 16 to 30 mm, thus simulating a large variety of valvular leaks. In steady flow conditions, our results agreed with previously reported descriptions. Under pulsatile conditions, the same structure was found at peak velocity and during the beginning of the deceleration. Below a threshold velocity, the length of the central core was independent of the peak velocity and proportional to about six times the orifice diameter. Above the threshold velocity, this relationship was no longer true, the threshold value being related to the ratio of the orifice diameter to the diameter of the receiving tube.
为了提供支持血流图临床应用的物理信息，设计了一种体外模型来测量脉动水力湍流射流中的速度场。我们使用的峰值速度范围为2.5至5.5米/秒，孔口直径范围为5.8至11.3毫米，并将射流限制在直径范围为16至30毫米的接收管中，从而模拟了各种瓣膜泄漏情况。在稳定流动条件下，我们的结果与先前报道的描述一致。在脉动条件下，在峰值速度和减速开始时发现了相同的结构。低于阈值速度时，中心核的长度与峰值速度无关，并且与孔口直径的大约六倍成正比。高于阈值速度时，这种关系不再成立，阈值与孔口直径与接收管直径的比值有关。
