By adding a narrow-sized coarse coal fraction to the finer coal slurry, the flow characteristics optimum coarse-to-fine particle ratio of 40:60 exist at which the slurry is Newtonian.

• 但继续增大粗颗粒在煤粉中的比例，体系的黏度又会增大，而且煤浆的流变性能也发生改变。