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| 1 | 基于EMMS模型的搅拌釜内气液两相流数值模拟显示文摘采用欧拉-欧拉模型对搅拌釜内气液两相流进行了三维CFD模拟,重点研究了采用不同曳力模型时CFD模拟对搅拌桨附近排出流区两相流动的预测能力。模拟结果表明CFD能准确地预测排出流区的液相速度分布,但采用传统的Schiller-Naumann曳力一定程度上低估了排出流区的气液相间曳力,导致在完全扩散区CFD预测的分布器和桨叶下方区域气含率偏小,而基于气液非均匀结构和能量最小多尺度(EMMS)方法得到的DBS-Global曳力模型能更准确地描述完全扩散区气液搅拌釜内流动情况。与传统曳力模型相比,采用DBS-Global曳力模型能显著提高对气含率的预测。 | 肖颀 杨宁 | 2016 | 化工学报2016，67，7： | 9 |
| 2 | 曳力模型和湍流模型对内环流反应器数值模拟的影响显示文摘研究了曳力模型和湍流模型对气升式内环流反应器流体力学参数的影响,进一步证实了DBS-Local曳力模型在气升式内环流反应器中的适用性。结果表明:曳力模型决定了是否可以模拟出下降管中的气体;而曳力模型和湍流模型共同作用,决定了气含率模拟结果的准确性。Schiller-Naumann、Tomiyama、Grace、Ishii-Zuber这4种曳力模型均无法预测出下降管含气这一现象,而DBS-Local曳力模型能够模拟出下降管中的气体。DBS-Local曳力模型与standard k-εmixture湍流模型组合,对气含率的预测值与实验值较为接近,而与RNG k-ε dispersed湍流模型组合,对轴向液速的预测值与实验值更为接近。 | 张佳宝 崔丽杰 杨宁 | 2018 | 化工学报2018，69，1： | 9 |
| 3 | 基于能量最小多尺度曳力模型的搅拌槽内气液两相流计算液体力学模拟及实验研究显示文摘采用双电导探针和欧拉-欧拉双流体模型对涡轮桨搅拌槽内局部气液分散特性分别进行了实验和三维计算流体力学(CFD)数值模拟研究。重点研究了转速对搅拌槽上下循环区局部气含率分布、全槽液相流场和湍动动能的影响。实验表明,转速对上循环区气含率分布的影响大于下循环区,且上循环区气含率随转速的增大而增大。CFD模拟比较了TOMIYAMA曳力模型和基于能量最小多尺度理论(EMMS)的DBS-Local曳力模型对局部气含率的预测结果。结果显示DBS-Local曳力模型能够较好地预测出不同搅拌转速下搅拌槽循环区气含率径向分布;TOMIYAMA曳力模型只能定量预测出低搅拌转速下(140r/min,280r/min)循环区的气含率分布,高转速下(420r/min,560r/min)该曳力模型不能模拟出下循环区壁面附近的气体,且低估了上循环区气含率。 | 李新菊 管小平 杨宁 刘明言 | 2017 | 化工进展2017，36，11： | 7 |
| 4 | Computational fluid dynamics simulation of hydrodynamics in the riser of an external loop airlift reactor显示文摘 | Xuedong Jiang Ning Yang Bolun Yang | 2016 | Particuology2016，14，4： | 6 |
| 5 | 基于EMMS方法的鼓泡塔反应器CFD及群平衡模拟显示文摘能量最小多尺度(energy-minimization multi-scale,EMMS)方法已经被应用于气液体系中群平衡(population balance model,PBM)模型的改进。EMMS模型可计算气泡破碎聚并过程的能量,进而获得聚并速率的修正因子。应用这一模型对高气速鼓泡塔进行了模拟计算,并进一步对比了均一尺径模型、CFD-PBM模型以及CFD-PBM-EMMS模型的模拟结果与实验数据。结果表明,在高表观气速条件下,基于EMMS方法的群平衡模型可以更加准确地预测鼓泡塔中不同高度的气泡尺径分布和轴向液速,同时提高了对整体气含率和局部气含率的模拟准确性。在表观气速为0.16 m·s^(-1)和0.25 m·s^(-1)时,CFD-PBM-EMMS模型对气泡尺径分布的预测精度更高,同时整体气含率模拟的相对误差下降为5%和15%,局部气含率模拟平均相对误差下降为8%和17%。 | 王珏 杨宁 | 2017 | 化工学报2017，68，7： | 5 |
| 6 | Modeling study on the flow patterns of gas–liquid flow for fast decarburization during the RH process显示文摘A water model and a high-speed video camera were utilized in the 300-t RH equipment to study the effect of steel flow patterns in a vacuum chamber on fast decarburization and a superior flow-pattern map was obtained during the practical RH process. There are three flow patterns with different bubbling characteristics and steel surface states in the vacuum chamber: boiling pattern(BP), transition pattern(TP), and wave pattern(WP). The effect of the liquid-steel level and the residence time of the steel in the chamber on flow patterns and decarburization reaction were investigated, respectively. The liquid-steel level significantly affected the flow-pattern transition from BP to WP, and the residence time and reaction area were crucial to evaluate the whole decarburization process rather than the circulation flow rate and mixing time. A superior flow-pattern map during the practical RH process showed that the steel flow pattern changed from BP to TP quickly, and then remained as TP until the end of decarburization. | Yi-hong Li Yan-ping Bao Rui Wang Li-feng Ma Jian-sheng Liu | 2018 | International Journal of Minerals,Metallurgy and Materials2018，25，2： | 2 |
| 7 | 基于介尺度稳定性条件的多相流曳力与群体平衡模型显示文摘介尺度结构和介尺度机制是化工、冶金、能源等过程工程中的重要科学问题。尽管多相流数理模型在过去的几十年中已取得长足进展,但仍存在准确性依赖可调参数、模型适用性有限、计算量大等问题,难以适应当前快速发展的新工艺和新过程开发的需求。实际上,基于平均化方法的多流体方程组需要若干子模型封闭,如相间作用力、聚并/破碎核函数以及湍流模型等;这些子模型决定了多流体模型的模拟准确性。从介科学角度发展介尺度物理模型为解决这些问题提供了新的思路。模型可以解析多相流非均匀结构演化的控制机制,进而改进或重构子模型。总结了基于介尺度稳定条件的两类介尺度封闭模型:一类用于封闭相间动量传递,如介尺度曳力;另一类用于封闭离散相特征参数的演化,如介尺度群体平衡模型,计算气泡或液滴尺寸。进而综述了这些模型在流化床、鼓泡塔、气升式环流反应器、搅拌槽、转定子乳化器等多相流设备中的应用,并展望了未来发展方向和关键科学问题。 | 管小平 杨宁 | 2022 | 化工学报2022，73，6： | 1 |
| 8 | 煤直接液化反应器循环杯的数值模拟及优化显示文摘针对煤直接液化反应器中的结焦问题,建立了多相流模型模拟了反应器内循环杯局部气-油煤浆两相的流动行为,得到了相含率等流体力学参数的空间分布情况。模拟结果表明,气液分离导致的泡沫聚并破碎以及雾沫夹带是形成结渣/结焦的主要原因。模拟研究了循环杯内堵塞程度与下降管中气含率的关系,表明随堵塞程度的提高,下降管中的气含率从0增加到34%,从而造成循环泵抽空。基于对结焦原因的分析,提出了优化的循环杯结构并进行了模拟分析。结果表明,改进后的循环杯结构可以有效强化气液分离,在极限条件下下降管中的气含率为14%,可以保证装置的稳定运行,为工业装置的改造提供了参考。 | 张传江 韩来喜 蒋雪冬 许明 门卓武 | 2017 | 化工学报2017，68，7： | 1 |
| 9 | Three-dimensional multiphase full-loop simulation of directional separation of binary particle mixtures in high-flux coal-direct chemical-looping combustion system显示文摘Coal-direct chemical-looping combustion(CDCLC)is a promising coal combustion technique that provides CO2 capture with a low energy penalty.In this study,we developed a three-dimensional Eulerian-Eulerian multiphase full-loop model for simulating the circulation and separation of binary particle mixtures in a novel high-flux CDCLC system.This model comprised a high-flux circulating fluidized bed as the fuel reactor(FR),a counter-flow moving bed as the air reactor(AR),a high-flux carbon stripper,two downcomers,and two J-valves.This model predicted the main features of complex gas-solid flow behaviors in the system.The simulation results showed that quasi-stable solid circulation in the whole system could be achieved,and the FR,AR,and J-valves operated in a dense suspension upflow regime,a near-plug-flow regime,and a bubbling fluidization regime,respectively.The multiphase flow model of binary particle mixtures was used to predict the mechanisms of directional separation of binary particle mixtures of an oxygen carrier(OC)and coal throughout the system.A decrease in the baffle aspect ratio of the inertial separator improved the coal selective separation efficiency but resulted in a slight decline in the OC selective separation;this is believed to be the result of weakening of particle collisions with the baffle.A higher FR gas velocity had a slightly negative effect on the OC selective separation efficiency,but improved the coal selective separation efficiency;this can be attributed to an increase in the particle-carrying capacity of the gas stream.A decrease in the coal particle size led to better entrainment of the coal particles by the gas stream and this increased the coal selective separation efficiency.In real CDCLC applications,the operating variables for separation of binary particle mixtures should be comprehensively assessed to determine their positive and negative effects on the carbon capture efficiency,OC regeneration efficiency,gas leakage restraint,energy consumption,and fuel conversion. | Xiaojia Wang Yali Shao Baosheng Jin Yong Zhang | 2020 | Particuology2020，18，2： | 1 |
| 10 | 气升式废水处理反应器内流场和传质特性的研究显示文摘针对废水生物处理中导流筒直径、表观气速、液位高度、黏度和表面张力对气升式反应器内流场和氧传质系数的影响进行研究,并利用气水冷模实验对气升式反应器进行简化分析。随着导流筒直径的增加,气含率、液速和氧传质系数都增大,最佳导流筒直径为120 mm。表观气速存在一个临界值,低于临界值,气含率、下降段液速和体积氧传质系数等特征参数随气速增加迅速增大;高于临界值特征参数增加变缓,最佳表观气速为3.0×10^(-3)m/s。随着液位高度的增加,气含率和体积氧传质系数减小,下降段液速增大,最佳液位高度为900 mm。液体黏度增大会使反应器内气含率和体积氧传质系数降低,表面张力的减小会使得反应器内气含率和体积氧传质系数增大。 | 吴松 任慧敏 | 2022 | 工业水处理2022，42，5： | 0 |
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