The metering principle of slotted orifice as a new type of flow sensor for gas-liquid two-phase flow is briefly introduced.The interaction mechanism between two-phase flow and slotted orifice was analyzed in detail.Various factors that affected the two-phase multipliers were investigated based on the theoretical model and experimental data.Based on the surface-fitting technique a precise correlation was obtained
which described the relationship among the two-phase multipliers
pressure
gas Froude number and Lockhart-Martinelli parameter.Such information is important for the development of condensate gas meter.