Abstract
In order to predict the relation between friction factor and Reynolds number forBinghain plastic fluid flow in circular smooth pipes, an improved mixing-length distribution is proposed in this paper. The distribution (i.e. Eq.(18)) is a modification of Van Driest's model for Newtonian fluid flow that is obtained through the results of the other researchers' studies about Newtonian and Bingham plastic fluid flow and the authors' mixing-length distribution for pseudo-plastic fluid flow in circular smooth pipes.The proposed mixing-length distribution makes it possible to predict the pressure loss of Bingham plastic fluid flow in circular smooth pipes since 163 out of 194 experimental data shown in Fig. 8 are within ±7% of the theoretical values. A set of theoretical design curves of friction factor versus Reynolds number is calculated and shown in Fig. 9.
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