水-空気系 2 相流による直交流充填塔内の圧力損失と液ホールドアップ

概要

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Measurements of liquid holdup and pressure drop were made for the two-phase flow of air-water through a crossflow gas-liquid contactor packed with 12-mm ceramic Raschig rings, 12-mm ceramic Berl saddles or S·O-shape polyethylene Tellerettes. For the crossflow operation, no flooding was observed ; however, the liquid was deflected to the flow direction of gas with increasing gas flow rate and eventually a violent splashing of liquid occurred. To correlate pressure drop data for the two-phase flow with the Blake-type friction factor, imaginary packings consisting of dry packings and total liquid holdup in the irrigated packed bed were supposed and the surface of packings per unit volume of imaginary dry packings, αv, was evaluated on the basis of the measured values of total liquid holdup. When the values of ReG were calculated from the evaluated values for αv, pressure drop data in the crossflow packed column could be correlated by the Blake-type friction factor regardless of the difference in geometry of the three types of packings.