Date of Award

3-1-1981

Document Type

Thesis

Department

Chemical Engineering

Abstract

The frictional pressure drop and critical velocity for lignitewater slurry flow through a horizontal two inch (nominal) black iron pipe was investigated. The mean slurry velocity ranged from 3 to 7 ft/s, and the range of solid concentration investigat~d was from 0 to 25 percent (wt.). The experiment was performed with the slurry tanks open to atmosphere. The temperature of the slurry was found to range from 18° to 25°C. The frictional pressure drop was correlated in the form of the Durand equation. The correlation was found to be in fair agreement with the other published correlations for different slurry systems. The critical velocity was also correlated with the slurry concentration. The experimental data appeared to be insufficient for presenting a general correlation for critical velocity. Most of the published correlations, for predicting critical velocity, were found to be inapplicable for a lignite-water system. At flow regions 60 percent above critical velocity, the slurry flow can be measured quite accurately by using a venturi meter. The classical single phase equation can be used for slurry flow measurements by venturi meters.

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