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| 1 | CFD modeling of turbulent reacting flow in a semi-batch stirred-tank reactor显示文摘For the mixing-sensitive reactions, both chemical kinetics and mixing conditions of the reactants determine the distributions of products. The direct quadrature method of moments combining with the interaction by exchange with the mean micro-mixing model(DQMOM-IEM) has been validated for the chemical reacting flows in microreactors. Quite encouraging simulation results offer great promise, but the applicability of this method is needed to be explored furthermore, such as in stirred reactors. In this work, the two-environment DQMOM-IEM model was created with C language and used to customize Fluent through the user-defined functions. The mixing effects on the course of parallel competing chemical reactions carried out in a semi-batch single-phase stirred reactor were predicted. The simulation results show that the rising feed velocity enlarges the volume of reaction zone and maximize the yield of the by-product, which also indicates that the feed stream is more difficultly dispersed into the main stream and the zone surrounding feedpipe exit with high turbulent kinetic dissipation rate cannot be efficiently used. | Xiaoxia Duan Xin Feng Chao Yang Zaisha Mao | 2018 | Chinese Journal of Chemical Engineering2018，26，4： | 6 |
| 2 | CFD-PBE simulation of a bubble column in OpenFOAM显示文摘A general CFD-PBE(computational fluid dynamics-population balance equation) solver for gas–liquid poly-dispersed flows of both low and high gas volume fractions is developed in OpenFOAM(open-source field operation and manipulation) in this work. Implementation of this solver in OpenFOAM is illustrated in detail. The PBE is solved with the cell average technique. The coupling between pressure and velocity is dealt with the transient PIMPLE algorithm, which is a merged PISO-SIMPLE(pressure implicit split operator-semi-implicit method for pressure-linked equations) algorithm. Results show generally good agreement with the published experimental data, whereas the modeling precision could be improved further with more sophisticated closure models for interfacial forces, the models for the bubble-induced turbulence and those for bubble coalescence and breakage.The results also indicate that the PBE could be solved out the PIMPLE loop to save much computation time while still preserving the time information on variables. This is important for CFD-PBE modeling of many actual gas–liquid problems, which are commonly high-turbulent flows with intrinsic transient and 3 D characteristics. | Jingcai Cheng Qian Li Chao Yang Yongqiang Zhang Zaisha Mao | 2018 | Chinese Journal of Chemical Engineering2018，26，9： | 5 |
| 3 | Numerical simulation of Marangoni effects of single drops induced by interphase mass transfer in liquid-liquid extraction systems by the level set method显示文摘The mathematical model of mass transfer-induced Marangoni effect is formulated. The drop surface evolution is captured by the level set method, in which the interface is represented by the embedded set of zero level of a scalar distance function defined in the whole computational domain. Numerical simulation of the Marangoni effect induced by interphase mass transfer to/from deformable single drops in unsteady motion in liquid-liquid extraction systems is performed in a Eulerian axisymmetric reference frame. The occurrence and development of the Marangoni effect are simulated, and the re- sults are in good agreement with the classical theoretical analysis and previous simulation. | WANG JianFeng YANG Chao MAO ZaiSha | 2008 | Science China Chemistry2008，51，7： | 4 |
| 4 | Measurement methods of particle size distribution in emulsion polymerization显示文摘The particle size distribution of polymer always develops in emulsion polymerization systems,and certain key phenomena/mechanisms as well as properties of the final product are significantly affected by this distribution.This review mainly focuses on the measurement methods of particle size distribution rather than average particle size during the emulsion polymerization process,including the existing off-line,on-line,and in-line measurement methods.Moreover,the principle,resolution,performance,advantages,and drawbacks of various methods for evaluating particle size distribution are contrasted and illustrated.Besides,several possible development directions or solutions of the in-line measurement technology are explored. | Shuaifeng Zhang Qinghua Zhang Jianzhuang Shang Zaisha Mao Chao Yang | 2021 | Chinese Journal of Chemical Engineering2021，34，11： | 2 |
| 5 | Experimental study by online measurement of the precipitation of nickel hydroxide: Effects of operating conditions显示文摘The objective of this work is using the online measurement method to study the process of precipitation of nickel hydroxide in a single-feed semi-batch stirred reactor with an internal diameter of D = 240 mm. The effects of impeller speed, impeller type, impeller diameter and feed location on the mean particle size d43 and particle size distribution(PSD) were investigated. d43 and PSD were measured online using a Malvern Insitec Liquid Process Sizer every 20 s. It was found that d43 varied between 13 μm and 26 μm under different operating conditions,and it decreased with increasing impeller diameter. When feeding at the off-bottom distance of D/2 under lower impeller speeds, d43 was significantly smaller than that at D/3. PSDs were slightly influenced by operating conditions. | Weiwei E Jingcai Cheng Chao Yang Zaisha Mao | 2015 | Chinese Journal of Chemical Engineering2015，23，5： | 2 |
| 6 | Micro-mixing in chemical reactors:A perspective显示文摘Micro-mixing is an important mechanism, which works simultaneously with macro-mixing in chemical reactors in process industries, for achieving the best selectivity with respect to desired products. In about a half century, a huge amount of data and knowledge has been accumulated from theoretical and experimental studies on micromixing. Nevertheless, those results are mostly composites of simplified theoretical and empirical models, and the true nature of interactions of flow inhomogeneity and micro-mixing with chemical reaction has not been fully unveiled. This article reviews the progress in micro-mixing study in chemical reactors to date. A few important topics related to the nature, experimental evaluation, and numerical simulation of micro-mixing are addressed.Some suggestions are given hopefully to motivate more chemical engineers to devote their efforts to better understanding of micro-mixing in chemical reactors. | Zaisha Mao Chao Yang | 2017 | Chinese Journal of Chemical Engineering2017，25，4： | 2 |
| 7 | A general diffusion model for mass transfer in colloidal liquid aphron systems显示文摘 | He Yi Wu Zhichun Mao Zaisha | 2009 | Colloids and Surfaces A: Physicochemical and Engineering Aspects2009，338，123： | 1 |
| 8 | Computational chemical engineering–Towards thorough understanding and precise application显示文摘The paradigms of chemical engineering discipline are discussed. The first paradigm of Unit Operations and the second paradigm of Transport Phenomena are well recognized among the chemical engineers all over the world, and what the next paradigm is remains still an open question. Several proposals such as Chemical product engineering, Sustainable chemical engineering and Multi-scale methodology are considered as candidates for next paradigm. Might Computational Chemical Engineering be the next one, which is advancing the discipline of chemical engineering toward ultimate mechanism-based understanding of chemical processes? This possibility is comparatively expounded with other proposals, and the scope and depth of computational chemical engineering are shortly listed. | Zaisha Mao Chao Yang | 2016 | Chinese Journal of Chemical Engineering2016，24，8： | 1 |
| 9 | Experimental and Numerical Study of Gas Holdup in Surface Aerated Stirred Tanks显示文摘 | Sun Haiyan Mao Zaisha Yu Gengzhi | 2006 | Chem Eng Sci2006，61，12： | 1 |
| 10 | Experimental and numerical study of gas hold-up in surface aerated stirred tanks显示文摘 | SUN HAIYAN MAO ZAISHA YU GENGZHI | 2006 | Chemical Engineering Science2006，61，12： | 1 |
| 11 | Numerical simulation of laminar solid-liquid two-phase flow in a stirred tank显示文摘 | Fan Long Mao Zaisha Yang Chao | 2007 | Chem Eng Comm2007，194，3： | 1 |
| 12 | Numerical simulation of micro-mixing in gas–liquid and solid–liquid stirred tanks with the coupled CFD-E-model显示文摘The coupled CFD-E-model for multiphase micro-mixing was developed,and used to predict the micro-mixing effects on the parallel competing chemical reactions in semi-batch gas–liquid and solid–liquid stirred tanks.Based on the multiphase macro-flow field,the key parameters of the micro-mixing E-model were obtained with solving the Reynolds-averaged transport equations of mixture fraction and its variance at low computational costs.Compared with experimental data,the multiphase numerical method shows the satisfactory predicting ability.For the gas–liquid system,the segregated reaction zone is mainly near the feed point,and shrinks to the exit of feed-pipe when the feed position is closer to the impeller.Besides,surface feed requires more time to completely exhaust the added H+solution than that of impeller region feed at the same operating condition.For the solid–liquid system,when the solid suspension cloud is formed at high solid holdups,the flow velocity in the clear liquid layer above the cloud is notably reduced and the reactions proceed slowly in this almost stagnant zone.Therefore,the segregation index in this case is larger than that in the dilute solid–liquid system. | Xiaoxia Duan Xin Feng Chong Peng Chao Yang Zaisha Mao | 2020 | Chinese Journal of Chemical Engineering2020，28，9： | 1 |
| 13 | A general diffu- sion model for mass transfer in colloidal liquid aphron systems显示文摘 | He Yi Wu Zhichun Mao Zaisha | 2009 | Colloids and Surfaces A: Physi- cochemical and Engineering Aspects2009，338，123： | 1 |
| 14 | Numerical simulation of laminar solid-liquid two-phase flow in stirred tanks 显示文摘 | Fan Long Mao Zaisha Yang Chao | 2007 | Chemical Engineering Communica- tions2007，194，3： | 1 |
| 15 | A volume-amending method to improve mass conservation of level set approach for incompressible two-phase flows显示文摘A volume-amending method is developed both to keep the level set function as an algebraic distance function and to preserve the bubble mass in a level set approach for incompressible two-phase flows with the significantly deformed free interface. After the traditional reinitialization procedure, a vol-ume-amending method is added for correcting the position of the interface according to mass loss/gain error until the mass error falls in the allowable range designated in advance. The level set approach with this volume-amending method incorporated has been validated by three test cases: the motion of a single axisymmetrical bubble or drop in liquid, the motion of a two-dimensional water drop falling through the air into a water pool, and the interactional motion of two buoyancy-driven three- dimensional deformable bubbles. The computational results with this volume-amending method in-corporated are in good agreement with the reported experimental data and the mass is well preserved in all cases. | LI XiangYang WANG YueFa YU GengZhi YANG Chao MAO ZaiSha | 2008 | Science China Chemistry2008，51，11： | 1 |
| 16 | Numerical simulation of turbulent solid-liquid two-phase flow and orientation of slender particles in a stirred tank 显示文摘 | Long Fan Zaisha Mao Yundong Wang | 2005 | Chemical Engineering Science2005，60，24： | 1 |
| 17 | Numerical simulation of turbulent solid-liquid two-phase flow and orientation of slender particles in a stirred tank显示文摘 | Fan Long Mao Zaisha Wang Yundong | 2005 | Chemical Engineering Sciences2005，60，24： | 1 |
| 18 | Numerical study of solid-liquid two-phase flow in stirred tanks with rushton impeller-(I) formulation and simulation of flow field显示文摘 | WANG Feng WANG Weijing MAO Zaisha | 2004 | Chinese Jonural of Chemical Engineering2004，12，5： | 1 |
| 19 | Numerical simulation of barium sulfate precipitation process in a continuous stirred tank with multiple-time-scale turbulent mixer model显示文摘 | Zhang Qinghua Mao Zaisha Yang Chao | 2009 | Ind Eng Chen Res(S0888-5885)2009，48，1： | 1 |
| 20 | Experiments on bacterial removal of arsenic from a refractory arsenical gold concentrate and gold leaching by cyanidation显示文摘 | Mao Zaisha Li Ximing | 1996 | Huagong Yejin1996，17，3： | 1 |
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