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| 1 | 叶轮结构对浮选动力学特性的影响显示文摘为提高自吸式浮选机循环量及浮选过程矿物悬浮均匀性,以 JJF-0. 2m;试验样机作为基础研究模型,对原有的星型径向叶轮进行结构优化后形成了一种改进叶轮。 通过 CFD 方法对比分析了两种叶轮对流场特征、湍动能分布、循环量及功耗的影响,并进一步对两种叶轮的整体性能参数进行了研究,探讨了粒度和叶轮结构对矿物悬浮均匀性的影响。 结果表明:在叶轮转速为 997r/ min 时,2 种叶轮均能形成适宜矿物浮选的流场特征,相较于星型径向叶轮,改进叶轮在竖筒和循环筒内形成了更强的湍动能,循环量提升了 45%,功耗增大了 5%,吸气量提升了 3%。 随粒度增大矿物悬浮均匀性变差,改进叶轮在提高矿物悬浮均匀性和解决矿物沉槽问题方面效果显著。 | 唐军 滕瑜崇 刘辉 于明明 匡敬忠 符东成 | 2022 | 金属矿山2022，51，4： | 1 |
| 2 | Effects of surface vortex on the drawdown and dispersion of floating particles in stirred tanks显示文摘The effects of surface vortex on the drawdown and dispersion of floating particles in stirred tanks were investigated.Particle distribution and power consumption were analyzed by experiments and numerical simulations in both baffled and unbaffled tanks agitated by a Rushton impeller.In unbaffled tanks,a non-aggregation rule was applied and the average dispersion index was found to serve as a reasonable prediction of the full drawdown of floating particles.The critical impeller speeds in an unbaffled tank were higher than those in a tank with vertical baffles.At each immersion depth in a baffled tank,particles distributed more uniformly and more power was consumed.Comparison of snapshots of the baffled and unbaffled tanks shows that the surface vortex increases the drawdown speed while it decreases the particle distribution uniformity and power consumption.Therefore,the use of baffles to suppress the surface vortex provides for a more uniform particle distribution in stirred tanks. | Wentao Xu Yangbo Tan Meng Li Jianglong Sun De Xie Zeng Liu | 2020 | Particuology2020，18，2： | 0 |
| 3 | CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers显示文摘This work aims to systematically study hydrodynamics and mixing characteristics of non-Newtonian fluid(carboxyl methyl cellulose,CMC)in dual shaft eccentric mixer.Fluid rheology was described by the power law rheological model.Computational fluid dynamics was employed to simulate the velocity field and shear rate inside the stirred tank.The influence mechanism of the rotational modes,height difference between impellers,impeller eccentricities,and impeller types on the flow field have been well investigated.We studied the performance of different dual-shaft eccentric mixers at the constant power input with its fluid velocity profiles,average shear strain rate,mixing time and mixing energy.The counter-rotation mode shows better mixing performance than co-rotation mode,and greater eccentricity can shorten mixing time on the basis of same stirred condition.To intensify the hydrodynamic interaction between impellers and enhance the overall mixing performance of the dual shaft eccentric mixers,it is critical to have a reasonable combination of impellers and an appropriate spatial position of impellers. | Songsong Wang Xia Xiong Peiqiao Liu Qiongzhi Zhang Qian Zhang Changyuan Tao Yundong Wang Zuohua Liu | 2023 | Chinese Journal of Chemical Engineering2023，62，10： | 0 |
| 4 | Performance of vertical axis water turbine with eye-shaped baffle for pico hydropower显示文摘t A series of inline pico hydropower systems,which could be used in confined space,especially for water distribution networks(WDNs),was designed and investigated.The turbine with an eye-shaped vertical water baffle was developed to evaluate the hydraulic performance.A three-dimensional dynamic mesh was employed and the inlet velocity was considered as the inlet boundary condition,whereas the outlet boundary was set as the outflow.Then,numerical simulations were conducted and the standard k-εturbulence model was found to be the best capable of predicting flow features through the comparison with the experimental results.The effects of the opening diameter of the water baffle and installation angle of the rotor on the flow field in the turbine were investigated.The results suggested that the water baffle opening at d=30 mm and the rotor at a 52°angle could achieve the highest efficiency of 5.93%.The proper eye-shaped baffle not only accelerates the fluid flow and generates positive hydrodynamic torque,but also eliminates the flow separation.The scheme proposed in this paper can be exploited for practical applications in the water pipelines at various conditions and power requirements. | Zhuohuan HU Dongcheng WANG Wei LU Jian CHEN Yuwen ZHANG | 2022 | Frontiers in Energy2022，16，4： | 0 |
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