Abstract
Using a high temperature plastometer with a new cone-shaped shearing disk, the effect of shear rate ({gamma}R) on the apparent viscosity of softened coal was studied. For {gamma}R from 2.01 s{sup {minus}1} to 10.7 s{sup {minus}1}, no shear rate effect on the viscosity of Pittsburgh No. 8 high volatile bituminous coal was observed. Three other coals, each of different ranks ranging from high volatile bituminous to low volatile bituminous, were also studied. Although lower in tar and extractable yields than high volatile bituminous coals, medium and low volatile bituminous coals were found to be very plastic. Their good plastic behavior is therefore hypothesized to arise from their ability to generate higher molecular weight liquid fragments (``macrometaplast``) which are not represented by tar and extractable yields.
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