Study on characteristics of gas-solid slug flow

The pneumatic conveying and multifunctional experimental apparatus was built to study the flow characteristics and resistance of dense-phase gas-solid two phase flow in conveying pipeline.Systematic experiments with compressed-air,fly ash and cement as working medium were carried out to explore the trend of flow characteristics and resistance characteristics.The experimental results show that as the gas velocity grows,the solid mass flow rate,solid velocity and slip velocity increase synchronously,while the unit length pressure drop of the pipe gradually declines.Meanwhile,the influence of material performance on the flow characteristics and resistance property was described.An equation for calculating the pressure drop in slug flow was achieved,which is based on the experimental data and the principle of force equilibrium.Error analysis shows the results from the equation is in good agreement with experimental data.