The concept and calculations are proposed for the critical effective shear rate of pipe flow that the friction loss of non-Newtonian crude oil is decreased as the transporting temperature is declined.

• 相对牛顿流体,当流量增大时,非牛顿原油的摩阻损失增加幅度减小,并且原油流变指数越小,这种趋势越大;