| Rheology experiments of concentrated suspensions of coal in water were carried out using the Haake rotational rheometer RV2 and the Burrell-Severs capillary rheometer A120, resulting in a continuous curve for relative viscosity versus shear rate ranging from 0.1 to 11,000 reciprocal seconds. An optimum surfactant concentration is empirically determined where the slurry exhibits Newtonian behavior at moderate shear rates in the range of 100 to 500 reciprocal seconds. The intrinsic viscosity in the Krieger-Dougherty rigid sphere model is adjusted to make the model work for Newtonian coal water slurries. A concentrated suspension of coal with a wide particle size distribution is shown to produce a low relative viscosity. |
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