Abstract
The practicality of using a capillary viscometer for measuring the flow properties of coal is established. Sources of error, particularly viscous heating effects and thermal lags, are discussed and precautions are outlined. Foaming is thought to have been prevented over much of the capillary. Some results obtained with a high vitrinite coal are presented for temperatures 679–683 K, and pressures up to 77 MPa. The coal viscosity is highly temperature dependent, and also apparently dependent on shear rate.
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