HORIZONTAL FLOW OF GAS-LIQUID-SOLID PARTICLES SYSTEM

The three-phase flow of gas-liquid-fine particles system in horizontal tubes is commonly used in the coal liquifaction process and the slurry transfer of coal- water. The hydro-dynamic data of the three-phase flow of gas-liquid-fine particles system are required to specify for the operating conditions in these precesses. In this paper, the detailed data on the gas holdup and pressure drop in horizontal tubes are presented. This paper is a continuation of the previous report on the vertical flow. The experimental conditions are as follows : gas velocity = 0~800cm/s, liquid or slurry velocities = 15~100cm/s, solid particles concentration in slurry = 0~60wt%, average sizes of particles = 38, 63 and 110 μm, and diameters of tubes = 15 and 26 mm. Experimental results show that only slight differences between the three-phase and the two-phase flows are detected in gas holdup measurements, but in the three-phase flow much smaller gas holdups are observed at low slurry flow rates, that the pressure drop increases with the solid particles concentration, and that the particles size has a complicated effect on the pressure drop