Friction and heat and mass transfer for turbulent pseudoplastic non‐newtonian fluid flows in rough pipes

Abstract

AbstractFriction factor and heat and mass transfer coefficient correlations are developed for turbulent pseudoplastic (purely viscous or inelastic) non‐Newtonian fluids flowing through rough pipes.A correlation for friction factor which is applicable in the region of transition from the smooth to the fully‐rough regime is proposed. It is obtained by adding the two correlations for the limiting situations, i.e. smooth pipes and fully‐rough pipes. The predictions of the proposed correlation are compared with published experimental data and other previous correlations.A model for heat and mass transfer is developed on the basis of the Levich three‐zone model. It is found that the proposed model is capable of predicting satisfactorily heat and mass transfer coefficients for Newtonian and pseudoplastic non‐Newtonian fluid flow in rough pipes.