New correlation of slotted orifice for gas-liquid two-phase flow with low liquid fractions

For the purpose of accurately measuring flow rates of wet gas, the multiplier correlation for slotted orifice was studied based on experimental data and some theoretical results. Qualitative conclusions about how two-phase multipliers changing with Lockhart-Martinelli parameter, gas Froude number and beta ratio were made for slotted orifices with beta ratios equal to 0.50, 0.60 and 0.75. A new correlation for slotted orifice was put forward, and the performance of existed correlations for the standard orifice plate and the new correlation was compared and analyzed in detail. The proposed correlation shows a more accurate calculation results, and the mean relative errors are all less than 4% for slotted orifice with different beta ratios.