Shombert D G
Division of Physical Sciences, Food and Drug Administration, Rockville, MD 20857.
J Biomech Eng. 1992 Nov;114(4):521-6. doi: 10.1115/1.2894105.
Fluid dynamic properties of Dacron vascular grafts were studied under controlled steady-flow conditions over a Reynolds number range of 800 to 4500. Knitted and woven grafts having nominal diameters of 6 mm and 10 mm were studied. Thermal anemometry was used to measure centerline velocity at the downstream end of the graft; pressure drop across the graft was also measured. Transition from laminar flow to turbulent flow was observed, and turbulence intensity and turbulent stresses (Reynolds normal stresses) were measured in the turbulent regime. Knitted grafts were found to have greater pressure drop than the woven grafts, and one sample was found to have a critical Reynolds number (Rc) of less than one-half the value of Rc for a smooth-walled tube.
在雷诺数范围为800至4500的受控稳定流条件下，研究了涤纶血管移植物的流体动力学特性。研究了标称直径为6毫米和10毫米的针织和编织移植物。采用热风速仪测量移植物下游端的中心线速度；还测量了移植物两端的压降。观察到从层流到湍流的转变，并在湍流状态下测量了湍流强度和湍流应力（雷诺法向应力）。发现针织移植物的压降比编织移植物大，并且发现一个样品的临界雷诺数（Rc）小于光滑壁管Rc值的一半。
