Abstract
In a support study for the development of the Synthoil coal liquefaction process, liquid (or slurry) holdups resulting from the flow of gas-liquid and gas-coal slurry mixtures in vertical tubes were measured. The effect of the viscosity of the liquid phase, the density of the gas phase, and the tube diameter on holdup values were investigated. The results showed that slurries of coal particles (up to 27.1 wt.%) in a white mineral oil behave as homogeneous Newtonian fluids. Therefore, the results obtained for the flow of gas-liquid mixtures are equally applicable to the flow of the type of gas-slurry mixtures that exist in the Synthoil coal liquefaction process.
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