The goal of this paper is to provide an approach to investigate the variation of fiber quantity in a certain cross-section of the drafting zone. This model with discrete-event simulation( DES)method was presented to s...The goal of this paper is to provide an approach to investigate the variation of fiber quantity in a certain cross-section of the drafting zone. This model with discrete-event simulation( DES)method was presented to simulate the dynamic drafting process. This model described the behavior of individual fibers,which was divided into four phases and simulated by corresponding modules. Three sets of processing conditions in industry were simulated and demonstrated the applications of this model. The comparison between experiments and simulation results could also validate this model. This model could be used to simulate various drafting process with appropriate drafting settings.展开更多
The 3-D hydrodynamics of shear thinning fluids in a stirred tank with an anchor impeller were numerically simulated.By using a computational fluid dynamics code（CFX 13.0）,the obtained results give a good prediction ...The 3-D hydrodynamics of shear thinning fluids in a stirred tank with an anchor impeller were numerically simulated.By using a computational fluid dynamics code（CFX 13.0）,the obtained results give a good prediction of the hydrodynamics such as the velocity fields and cavern size.The multiple reference frames（MRF） technique was employed to model the rotation of the impellers.The rheology of the fluid was approximated using the Ostwald model.To validate the CFD model,some predicted results were compared with the experimental data and a satisfactory agreement was found.The effects of impeller speed,fluid rheology,and some design parameters on the flow pattern,cavern size and power consumption were explored.展开更多
基金the Key Grant Project of Ministry of Education of the People’s Republic of China through Project,China(No.113027A)the Fundamental Research Funds for the Central Universities,China
文摘The goal of this paper is to provide an approach to investigate the variation of fiber quantity in a certain cross-section of the drafting zone. This model with discrete-event simulation( DES)method was presented to simulate the dynamic drafting process. This model described the behavior of individual fibers,which was divided into four phases and simulated by corresponding modules. Three sets of processing conditions in industry were simulated and demonstrated the applications of this model. The comparison between experiments and simulation results could also validate this model. This model could be used to simulate various drafting process with appropriate drafting settings.
文摘The 3-D hydrodynamics of shear thinning fluids in a stirred tank with an anchor impeller were numerically simulated.By using a computational fluid dynamics code（CFX 13.0）,the obtained results give a good prediction of the hydrodynamics such as the velocity fields and cavern size.The multiple reference frames（MRF） technique was employed to model the rotation of the impellers.The rheology of the fluid was approximated using the Ostwald model.To validate the CFD model,some predicted results were compared with the experimental data and a satisfactory agreement was found.The effects of impeller speed,fluid rheology,and some design parameters on the flow pattern,cavern size and power consumption were explored.
