幂律流体两平行圆板间径向扩散层流进口段流动阻力的分析

ANANALYSIS ON RADIAL LAMINAR BOUNDABY LAYER DEVELOPMENT FLOW OF POWER-LAW FLUID BETWEEN TWO PARALLEL DISKS

在文献￣［２，３］的基础上，将其方法推广到幂律流体流动，首先导出幂律流体两平行圆板间径向扩散层流边界层的动量积分方程和能量积分方程。通过对动量积分方程的求解，对幂律流体的进口段长度以及进口段效应压力损失和流量修正系数进行了分析计算，并且讨论了幂律流体的流动指数ｎ与进口处修正雷诺数Ｒｅ＿１对进口段长度和压力损失系数的影响。特别是当ｎ＝１时，本文的解与文献￣［３］中的解完全一致，因而间接验证了本文结果的可靠性。

In this paper,B.B. Golubef method is first extended to analyze the laminarboundary layer development flow of power-law fluid between two parallel disks.With theboundary layer motion equation,we have derived both the momentum integral equationand the energy integral equation. Then by solving the momentum integral equation,thedevelopment of the boundary layer in the entrance region and coefficients of the entranceregion effect are analyzed and calculated. Furthermore, the effects of flow-index of power-law fiuid and the entrance modified Reynolds number on the entrance region length and thecoefficient of pressure loss are discussed.Specially, in the case of n=1(Newtonian fiuid),the solutions in this paper are completely identical with those in Ref.￣