Effect of Throat Length on Steam Ejector Critical Back Pressure

Abstract

Steam ejector is widely applied in chemical industry and many papers have published to investigate the structure configuration effects on the performance. Previous studies showed that the throat length of steam ejector has little influence on its performance. In this study, Computational Fluid Dynamics model of steam ejector is established to investigate the effects of ejector’s throat on its performance. The result shows that ejector’s length has little influence on its entrainment ratio. But, there is optimum throat length corresponding to biggest critical back pressure and which is corresponding with the biggest operating flexibility of steam ejectors. So, ejector’s throat length has an important effect on its operating flexibility and cannot be over- looked during the design process of steam ejectors.