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| 1 | Computational fluid dynamics(CFD) simulation of effect of baffles on separation in mixer settler显示文摘The main ideas in the development of the solvent extraction mixer settler focused on achieving clean phase separation,minimizing the loss of the reagents and decreasing the surface area of the settlers.The role of baffles in a mechanically agitated vessel is to ensure even distribution,reduce settler turbulence,promote the stability of power drawn by the impeller and to prevent swirling and vortexing of liquid,thus,greatly improving the mixing of liquid.The insertion of the appropriate number of baffles clearly improves the extent of liquid mixing.However,excessive baffling would interrupt liquid mixing and lengthen the mixing time.Computational fluid dynamics(CFD) provides a tool for determining detailed information on fluid flow(hydrodynamics) which is necessary for modeling subprocesses in mixer settler.A total of 54 final CFD runs were carried out representing different combinations of variables like number of baffles,density and impeller speed.CFD data shows that amount of separation increases with increasing baffles number and decreasing impeller speed. | Mohsen Ostad Shabani Ali Mazahery Mehdi Alizadeh Ali Asghar Tofigh Mohammad Reza Rahimipour Mansour Razavi Alireza Kolahi | 2012 | International Journal of Mining Science and Technology2012，22，5： | 12 |
| 2 | 不同气蚀次数球阀空化的数值研究(英文)显示文摘空化是控制阀中的一种破坏性现象。为了延缓空化,采用一种多孔圆柱板,称为trim。在此之前,我们曾研究过孔板直径和不同类型的trim的影响。本文采用4种不同工况(无trim,1,2和3 trims)对球阀进行数值分析,分析了trim的数量对气蚀强度、形成区域和空化起始点的影响。结果表明,与不加trim的阀门相比,增加一个或两个trim可以降低气蚀的强度,延缓空化的发生。然而,在使用两到三个trims的情况下,空化的强度和起始点没有明显的差异。由于trim生产成本高,流量系数严重下降,将trim数量增加到3个以上在经济和技术上都是不合理的。 | Hamidreza YAGHOUBI Seyed Amir Hossein MADANI Mansour ALIZADEH | 2018 | Journal of Central South University2018，25，11： | 6 |
| 3 | Distinct element modelling of fracture plan control in continuum and jointed rock mass in presplitting method of surface mining显示文摘Controlled blasting techniques are used to control overbreak and to aid in the stability of the remaining rock formation. Presplitting is one of the most common methods which is used in many open pit mining and surface blast design. The purpose of presplitting is to form a fracture plane across which the radial cracks from the production blast cannot travel. The purpose of this study is to investigate of effect of presplitting on the generation of a smooth wall in continuum and jointed rock mass. The 2D distinct element code was used to simulate the presplitting in a rock slope. The blast load history as a function of time was applied to the inner wall of each blasthole. Important parameters that were considered in the analysis were stress tensor and fracturing pattern. The blast loading magnitude and blasthole spacing and jointing pattern were found to be very significant in the final results. | Sharafisafa Mansour Aliabadian Zeinab Alizadeh Rezvan Mortazavi Ali | 2014 | International Journal of Mining Science and Technology2014，24，6： | 4 |
| 4 | 带辅助加热器的空间采暖太阳能集热器性能显示文摘本文研究了空间采暖太阳能集热系统的性能。在伊朗德黑兰城市的天气条件下,以一座70m^(2)的独立住宅为研究对象。住宅的供暖需求由带有平板集热器和辅助电加热器的热虹吸太阳能热水器系统供应。采用TRNSYS软件对该系统进行建模和分析。采用TRNBuild模块进行建筑荷载计算,并对该模型进行一年的运行模拟。评估了太阳能集热器表面积和存储体积的影响。结果表明:对于表面积为15m^(2)的太阳能集热器,1月份的太阳辐射率最低,为0.29。对于表面积为10m^(2)和5m^(2)的太阳能集热器,1月份的太阳辐射率分别降至0.23和0.14。此外,还考虑了150 L和300 L的储罐两种情况。最终,考虑到热性能和成本,使用一个15m^(2)的太阳能集热器和一个150 L的储罐可以满足建筑的采暖需求。 | Hassan BIGLARIAN Mohammad Mazidi SHARFABADI Mansour ALIZADEH Hossein GHARAEI | 2021 | Journal of Central South University2021，28，11： | 2 |
| 5 | Numerical prediction of hydrodynamic cavitating flow structures and their corresponding erosion显示文摘Hydrodynamic cavitating flows usually consist of 3-D intense vortical flows that are detached from solid boundaries.Detached vortical flows normally generate heaps of cavitating flow structures,which,in turn,govern the location of cavitation erosion before collapse.Thus,this study introduces a new numerical approach based on the improved delayed detached eddy simulation(IDDES)turbulence modeling for predicting cavitating flows.Then,the solution of compressible Eulerian-Eulerian two-phase flow and the IDDES turbulence model was linked to the microjet hypothesis and unsteady behavior of pressure and vapor volume to predict the corresponding erosion of cavitating flows.The method for cavitation erosion prediction,a modified version taken from previous studies,was applied as a post-processing tool.The validation of cavitating flow predictions was performed for the first time on the Grenoble axisymmetric nozzle by comparing them with 21 photos of cavitation from the previous experimental study.The results showed that the present numerical approach estimated various features of hydrodynamic cavitation well,including shedding processes and the length,shape,and collapse of cavitating structures.Using the numerical analysis,three main stages were detected for the present cavitating flow,and the vorticity-cavitation interactions were investigated by the vorticity transport equation.The streak-like and tube-like cavitating(STLIC and TULIC)structures were introduced in the second stage,initiated by flow instability,and entirely governed by corresponding turbulent flow structures.The collapse of these cavitating structures is one of the primary sources of cavitation erosion on lower and upper walls.The results of the numerical erosion predictions were compared with those of the previous erosion tests on the Grenoble axisymmetric nozzle.Satisfactory numerical performance was achieved in predicting the location and intensity of cavitation erosion. | Amirhossein Mohammadkhani Mansour Alizadeh | 2021 | Journal of Hydrodynamics2021，33，3： | 1 |
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