96/01388 Rheological characteristics of coal-water mixture fuel and pressure losses in pipe flow

Abstract

The rheological characteristics of coal-water mixture(CWN) fuel, based on the power law model, were investigated using the Haake rotational viscometer, which produced shear rates from 0.1 to . Test results showed that all the slurries exhibited non-Newtonian properties of shear-thinning behavior, i.e., pseudoplastic or yield-pseudoplastic. The slurries become more viscous as the temperature, the mean particle size, and the amount of anionic surfactant were lowered. Furthermore, the yield stress measured in the case of no additive varied with the solid volume fraction and the coal particle size. The CWMs displayed a higher degree of pseudoplasticity with an increase in coal content and with a decrease in the mean size of the coal particles, the amount of additive, and the temperature. The pressure loss data obtained in the CWM test loop were coincided with the calculated values from the correlation based on the power law constants. Also, the generalized Reynolds number()-friction factor(f) relationship could be applied to the laminar flow of CWM fuel.