This paper examines the critical flow rates of gas and liquid necessary to keep particles moving in a horizontal flow line with emphasis on flows with high gas-liquid ratios resulting in stratified flow with small liquid hold-up. Experimental results are presented for flows in 0.05 m and 0.1 m pipes varying particle size and shape. The types of particles used are sand and glass beads. Additionally, experiments are performed for two particle volume concentrations: 0.01 and 0.1 percent.

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