Abstract
In order to predict both the velocity profile and the relationship between friction factor and Reynolds number for pseudo-plastic fluids flow in smooth pipes, and improved mixing-length distribution is proposed in this paper. This distribution is a modification of Van Driest's model for Newtonian fluids flow obtained by referring to the results of the other researcher's studies about Newtonian and pseudo-plastic fluids. It seems that this mixing-length distribution is suitable for estimating and calculating both the velocity profile and the pressure loss for Newtonian and pseudo-plastic fluids flow in circular smooth pipes through the analyzed results as compared with experimental results. A set of design curves of friction factor versus Reynolds number is presented.
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