Pressure drop of gas-liquid two phase co-current flowing down through the orifice unit of sieve plate

For the basic unit of stacked sieve plate packing, 12 orifice plates were used to study the pressure drop characteristics of gas-liquid two-phase co-current flowing down through the orifice, and the influence of flowrates and the orifice plate structure was clarified. The experimental results showed that the pressure drop increases with the increase of gas-liquid flow rate, decreases with the increase of orifice diameter. In the usual thickness range of the sieve plate, the pressure drop increases with the decrease of plate thickness due to the sharp edge effect of the orifice. According to the different behaviors of the pressure, the pressure drop prediction correlation of a single gas phase downward through the orifice was established with the Reynolds number of 5000 as the demarcation. When the gas Reynolds number is greater than 5000, the correlation is modified by using the gas phase conversion factor, and the pressure drop prediction correlation of gas-liquid two phases flowing down through the orifice was obtained. When the gas Reynolds number is less than 5000, the prediction correlation of gas-liquid two-phase pressure drop in the corresponding range of gas Reynolds number was obtained by directly modifying the single gas resistance coefficient. © 2020, Chemical Industry Press. All right reserved.