EFFECT OF PARTICLE SIZE AND SOLID CONCENTRATION ON RHEOLOGY OF COAL-WATER SLURRIES.

* Lecturer Assis. Mining & Petroleum Eng. Dept., Faculty of Engineering, Al-Azhar University

**Assis. Prof. of Mineral processing, Mining & Petroleum Eng. Dept., Faculty of Engineering, Al-Azhar University.

** Prof. of Mineral processing, Mining & Petroleum Eng. Dept., Faculty of Engineering, Al-Azhar University

*** Prof. of Hydraulics, Civil Eng. Dept., Faculty of Engineering, Al-Azhar University

In the present paper the rheological characteristics of coal-water slurry (CWS) were

investigated. The studied factors included the effect of particle size and solid concentrations.

The power-law model was applied to determine the non-Newtonian properties using a

Chandler Engineering viscometer Model 3500LS+ (rotational viscometer) at shear rates from

the decrease in mean particle size and with the increase of coal content. At low solid

concentrations the slurry may be considered as a Newtonian fluid.