Flow field modeling and eddy current field simulation research of overflow dyeing machine round nozzle

In order to study the effect of the gas-liquid two-phase flow characteristics on fabric dyeing inside the nozzle,a computational fluid dynamics mathematical model has been developed to simulate liquid flow characteristics and liquid flow effect on gas on 3-D basis,then according to the simulated results,dynamic and static pressure changes and the velocity and pressure field distribution were analyzed in the nozzle.Study results showed that the rapid movement of liquid phase causes the dynamic pulse of gas,which make subatmospheric pressure generate in the nozzle.The speed of liquid becomes larger and the pressure change more greatly,the tortuous flow phenomenon is marked in the nozzle pipe.According to the related thermodynamics theory and simulation analysis results,the gas sources and power sources of the tambourphenomenon and the fabric tangle phenomenon often occurred in the actual production process are ascertained,and then improvement blue print of the nozzle is presented.