The slotted-orifice is a new type of flow sensor for gas-liquid two-phase flow measurement, and there is no correlation of two-phase multipliers for the slotted-orifice available. Based on the air-water two-phase flow experimental data of slotted-orifice, five typical correlations of the standard throttle device were applied to the data, and the application range and the reason for error involved from these correlations were analyzed. Based on different modeling ideas, three new correlations, wh
