Wine culture is considered as an indispensible part of the culture in different countries. Distinctive differences exist between Chinese wine culture and the wine culture in western countries due to their historical b...Wine culture is considered as an indispensible part of the culture in different countries. Distinctive differences exist between Chinese wine culture and the wine culture in western countries due to their historical backgrounds, different values, cultures and customs, etc. A general study of the comparison between Chinese wine culture and western wine culture is given in this paper in order to help us have a better understanding of the wine culture and make us be aware of showing mutual respect for each other.展开更多
This paper presents experimental and computational studies on the flow behavior of a gas-solid fluidized bed with disparately sized binary particle mixtures. The mixing/segregation behavior and segregation efficiency ...This paper presents experimental and computational studies on the flow behavior of a gas-solid fluidized bed with disparately sized binary particle mixtures. The mixing/segregation behavior and segregation efficiency of the small and large particles are investigated experimentally. Particle composition and operating conditions that influence the fluidization behavior of mixing/segregation are examined. Based on the granular kinetics theory, a multi-fluid CFD model has been developed and verified against the experimental results. The simulation results are in reasonable agreement with experimental data. The results showed that the smaller particles are found near the bed surface while the larger particles tend to settle down to the bed bottom in turbulent fluidized bed. However, complete segregation of the binary particles does not occur in the gas velocity range of 0.695-0.904 m/s. Segregation efficiency increases with increasing gas velocity and mean residence time of the binary particles, but decreases with increasing the small particle concentration. The calculated results also show that the small particles move downward in the wall region and upward in the core. Due to the effect of large particles on the movement of small particles, the small particles present a more turbulent velocity profile in the dense phase than that in the dilute phase.展开更多
文摘Wine culture is considered as an indispensible part of the culture in different countries. Distinctive differences exist between Chinese wine culture and the wine culture in western countries due to their historical backgrounds, different values, cultures and customs, etc. A general study of the comparison between Chinese wine culture and western wine culture is given in this paper in order to help us have a better understanding of the wine culture and make us be aware of showing mutual respect for each other.
基金The authors acknowledge support by the National Natural Science Foundation of China through the programs “Multiple scale analysis and scaling-up of direct coupled dual gas-solid fiuidized reaction systems” （Grant No. 20490202）； “Fundamental Research on the Chemical Engineering of Heavy Oil Staged Separation” （Grant No. 20525621）；“Simulation on transfer and coking processes in disengagers of resid fluid catalytic cracking units” （Grant No. 20406013）；the National Natural Science Foundation for Distinguished Young Scholars of China （Grant No. 20725620）.
文摘This paper presents experimental and computational studies on the flow behavior of a gas-solid fluidized bed with disparately sized binary particle mixtures. The mixing/segregation behavior and segregation efficiency of the small and large particles are investigated experimentally. Particle composition and operating conditions that influence the fluidization behavior of mixing/segregation are examined. Based on the granular kinetics theory, a multi-fluid CFD model has been developed and verified against the experimental results. The simulation results are in reasonable agreement with experimental data. The results showed that the smaller particles are found near the bed surface while the larger particles tend to settle down to the bed bottom in turbulent fluidized bed. However, complete segregation of the binary particles does not occur in the gas velocity range of 0.695-0.904 m/s. Segregation efficiency increases with increasing gas velocity and mean residence time of the binary particles, but decreases with increasing the small particle concentration. The calculated results also show that the small particles move downward in the wall region and upward in the core. Due to the effect of large particles on the movement of small particles, the small particles present a more turbulent velocity profile in the dense phase than that in the dilute phase.
