Carr R T, Kotha S L
Department of Chemical Engineering, University of New Hampshire, Durham 03824-3591, USA.
J Biomech Eng. 1995 Nov;117(4):442-7. doi: 10.1115/1.2794205.
Flow visualization experiments of Newtonian laminar flow through branching tubes have been performed to identify the shape of the separation surface or flow divider. The influences of Reynolds number, flow fraction into the side branch, and branch geometry on the separation surface shape have been considered. The shapes presented in this paper are formed by the intersection of the separation surface with the cross section of the parent tube. At low Re the separation surfaces are curved in a convex manner, bulging away from the opening of the side branch. Increasing Re causes the surface to become concave. At Re > 194 the surfaces can become closed for Q* > 0.3. The branch angle has no noticeable effect on the separation surface shape. The side to parent branch diameter ratio, Db/Dp, has a strong influence at low Re. As Re increases the diameter effect diminishes. Previous studies have shown no difference between the separation surfaces of T and Y type junctions at low Re. At Re = 194 there is a marked difference between the separation surfaces of T and Y bifurcations.
已进行了关于牛顿层流通过分支管的流动可视化实验，以确定分离表面或分流器的形状。研究了雷诺数、进入侧支的流量分数以及分支几何形状对分离表面形状的影响。本文给出的形状是分离表面与主管横截面的交线形成的。在低雷诺数时，分离表面呈凸形弯曲，向远离侧支开口的方向鼓起。雷诺数增加会使表面变为凹形。当雷诺数大于194且流量分数Q*大于0.3时，表面可能会闭合。分支角度对分离表面形状没有明显影响。侧支与主管直径比Db/Dp在低雷诺数时有很大影响。随着雷诺数增加，直径效应减弱。先前的研究表明，在低雷诺数时，T型和Y型接头的分离表面没有差异。在雷诺数为194时，T型和Y型分支的分离表面存在明显差异。
