Abstract
Experimental results related to the pressure drop in steady and fully developed gas-liquid-solid three-phase slug flows in vertical pipes are presented. The experiment was carried out in pipes of 20.9, 30.6, and 50.8 mm I.D. and with solid particles of 2.57 mm mean diameter. Air and water were used as the gas and liquid phases, respectively. An estimating method for the pressure drop in three-phase slug flow is proposed based on a model that devides a slug unit into six regions. A momentum equation is applied to each region and to each boundary between regions. The volumetric fraction and the velocity of each phase in each region are estimated, using the volume balance equations and some correlations. The pressure drop is estimated, using these values. The estimated results of the pressure drop are compared with the measured values, and it is confirmed that this method is useful in estimating such a pressure drop.
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