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学者姓名：王晓达
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Abstract ：
Predicting the critical transition condition for different behaviors of droplet flowing through a micro contraction is a classic academic issue, and there is currently a lack of a simple and universally applicable prediction formula. This article aims to construct critical transition conditions for different droplet behaviors through their char-acteristic time. In present work, the droplet behavior, including deformation and breakup, are observed in a locally contractive microchannel by a high-speed camera. By tracing the dynamic evolution of droplet interface, it is found that the essential differences between droplet deformation and breakup is whether the minimum neck width will be less than the critical value for the appearance of the irreversible collapse. Based on this, two characteristic times are proposed to describe the deformation and breakup processes, which well explain the trend of flow pattern transition lines. Two mathematical models are established for the two characteristic times, and the critical conditions for the transformation from deformation to breakup is derived from these models. The predicted results are in good agreement with the experimental results, indicating the applicability of the pro-posed method in this paper.
Keyword ：
Breakup Breakup Contraction -expansion microchannel Contraction -expansion microchannel Critical criterion Critical criterion Deformation Deformation Droplet breakup Droplet breakup
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| GB/T 7714 | Zou, Xinyuan , Luo, Wenli , Chang, Zhidong et al. Critical criterion for droplet breakup in a contractive microchannel [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2024 , 150 . |
| MLA | Zou, Xinyuan et al. "Critical criterion for droplet breakup in a contractive microchannel" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 150 (2024) . |
| APA | Zou, Xinyuan , Luo, Wenli , Chang, Zhidong , Wang, Xiaoda . Critical criterion for droplet breakup in a contractive microchannel . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2024 , 150 . |
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An integrated microfluidic planar reactor is essential for achieving efficient and enhanced photocatalytic water treatment. Optimization of catalysts is an area of intense study owing to the need to enhance the performances of microreactors. A high-efficiency photocatalytic microreactor is presented here by combining a planar microreactor with a high-efficiency photocatalyst. TiO2 nanoparticles doped with Y and Yb were prepared to improve the photocatalytic reaction efficiency. First, better performance is achieved with the Y, Yb/TiO2 and TiO2 microreactors than conventional bulk reactors because of good photodegradation and a high reaction rate. Then, the Y, Yb/TiO2 film microreactor exhibits not only efficient catalytic activity with UV light but also higher photocatalytic activity under visible light irradiation than that achieved by a TiO2 film microreactor. The reaction rate constant of the Y, Yb/TiO2 film microreactor is approximately 0.530 s(-1), which is twice that of the TiO2 film microreactor. Moreover, the performances under continuous and intermittent reactions are compared to evaluate the stability of the microreactor, thereby building the foundation for practical application of continuous water treatment in the microreactor.The planar microreactor provides a convenient platform for studying photodegradation under various conditions, such as different temperatures, flow rates, light irradiation (UV and Vis), and reaction modes (continuous and intermittent).
Keyword ：
continuous water treatment continuous water treatment microreactor microreactor photodegradation photodegradation stability stability TiO2 TiO2
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| GB/T 7714 | Ge, Xue-hui , Wei, Nanjie , Hu, Xinyue et al. The integrated microfluidic photocatalytic planar reactor under continuous operation [J]. | FRONTIERS IN CHEMICAL ENGINEERING , 2024 , 6 . |
| MLA | Ge, Xue-hui et al. "The integrated microfluidic photocatalytic planar reactor under continuous operation" . | FRONTIERS IN CHEMICAL ENGINEERING 6 (2024) . |
| APA | Ge, Xue-hui , Wei, Nanjie , Hu, Xinyue , Xie, Qinyin , Wang, Xiaoda , Li, Ling et al. The integrated microfluidic photocatalytic planar reactor under continuous operation . | FRONTIERS IN CHEMICAL ENGINEERING , 2024 , 6 . |
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Although it was experimentally verified the microchannels with periodic expansion structures can effectively intensify the mass transfer of the slug flow, little research has focused on their geometric design. Hereon, a numerical simulation is conducted to evaluate the impact of microchannel geometry on the mass transfer of slug flow. The square expansion unit performs better than the triangular and circular ones. With the increase of the length, width, and number of the expansion units, and the width of the constriction between the adjacent expansions, the mass transfer performance shows a non-monotonic variation, that is an initial increase followed by a decrease. The underlying reasons are analyzed by evaluating the mixing inside and outside the droplet and the effective mass transfer area. At the preliminarily optimized geometry, a novel mass transfer path, in which not only the droplet caps but also the droplet body becomes the effective mass transfer area, is observed. © 2024 Elsevier Ltd
Keyword ：
Mass transfer intensification Mass transfer intensification Numerical simulation Numerical simulation Periodic expansion microchannel Periodic expansion microchannel Slug flow Slug flow Structure design Structure design
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| GB/T 7714 | Han, Y. , Wang, X. , Yin, Y. . Geometry effect on the mass transfer of slug flow in the microchannels with periodic expansion units [J]. | Chemical Engineering Science , 2024 , 299 . |
| MLA | Han, Y. et al. "Geometry effect on the mass transfer of slug flow in the microchannels with periodic expansion units" . | Chemical Engineering Science 299 (2024) . |
| APA | Han, Y. , Wang, X. , Yin, Y. . Geometry effect on the mass transfer of slug flow in the microchannels with periodic expansion units . | Chemical Engineering Science , 2024 , 299 . |
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One of the important strategies for the scale-up of microreactors is sizing-up, which is conducted by increasing the hydrodynamic diameter of microreactors. However, the interphase mass transfer deteriorates seriously in the sizing-up. This work aimed to probe the possibility of adding an inert gas phase to offset the adverse effect of microreactor sizing-up on the mass transfer between two immiscible liquid phases. Using a high-speed camera, four flow patterns were observed in three capillaries with their diameters ranging from 0.8 to 3.0 mm. Empirical equations were given to describe the flow-pattern transitions. The influencing mechanism of the capillary diameter on the liquid–liquid mass transfer was analyzed by taking the effect of adding the inert gas phase into account. Finally, the evaluation of the energy consumption suggested that adding an inert gas phase to agitate the flow could utilize the input energy more efficiently to intensify the liquid–liquid mass transfer in the microchannel with a larger hydrodynamic diameter. Therefore, the method of inert gas agitation is a meritorious assistive technology in the sizing-up of microreactors. © 2024 Elsevier Inc.
Keyword ：
Energy efficiency Energy efficiency Flow pattern Flow pattern Gas agitation Gas agitation Gas–liquid-liquid three phases Gas–liquid-liquid three phases Mass transfer Mass transfer Microreactor Microreactor Process intensification Process intensification Scale-up Scale-up
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| GB/T 7714 | Huang, W. , Ren, X. , Xiao, L. et al. Sizing-up effect on the flow pattern and mass transfer of gas–liquid-liquid three-phase flow in microchannels [J]. | Experimental Thermal and Fluid Science , 2024 , 159 . |
| MLA | Huang, W. et al. "Sizing-up effect on the flow pattern and mass transfer of gas–liquid-liquid three-phase flow in microchannels" . | Experimental Thermal and Fluid Science 159 (2024) . |
| APA | Huang, W. , Ren, X. , Xiao, L. , Zheng, K. , Ge, X.-H. , Wang, X. . Sizing-up effect on the flow pattern and mass transfer of gas–liquid-liquid three-phase flow in microchannels . | Experimental Thermal and Fluid Science , 2024 , 159 . |
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High-purity ethylene carbonate (EC) is widely used as battery electrolyte, polycarbonate monomer, organic intermediate, and so on. An economical and sustainable route to synthesize high-purity ethylene carbonate (EC) via the transesterification of dimethyl carbonate (DMC) with ethylene glycol (EG) is pro-vided in this work. However, this reaction is so fast that the reaction kinetics, which is essential for the industrial design, is hard to get by the traditional measuring method. In this work, an easy-to-assemble microreactor was used to precisely determine the reaction kinetics for the fast transesterification of DMC with EG using sodium methoxide as catalyst. The effects of flow rate, microreactor diameter, catalyst con-centration, reaction temperature, and reactant molar ratio were investigated. An activity-based pseudo-homogeneous kinetic model, which considered the non-ideal properties of reaction system, was estab-lished to describe the transesterification of DMC with EG. Detailed kinetics data were collected in the first 5 min. Using these data, the parameters of the kinetic model were correlated with the maximum average error of 11.19%. Using this kinetic model, the kinetic data at different catalyst concentrations and reactant molar ratios were predicted with the maximum average error of 13.68%, suggesting its satisfactory pre-diction performance.(c) 2022 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.
Keyword ：
Ethylene carbonate synthesis Ethylene carbonate synthesis Kinetics Kinetics Microreactor Microreactor Sodium methoxide Sodium methoxide Transesterification Transesterification
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| GB/T 7714 | Wang, Tengjie , Li, Wenkai , Ge, Xuehui et al. Kinetics measurement of ethylene-carbonate synthesis via a fast transesterification by microreactors [J]. | CHINESE JOURNAL OF CHEMICAL ENGINEERING , 2023 , 53 : 243-250 . |
| MLA | Wang, Tengjie et al. "Kinetics measurement of ethylene-carbonate synthesis via a fast transesterification by microreactors" . | CHINESE JOURNAL OF CHEMICAL ENGINEERING 53 (2023) : 243-250 . |
| APA | Wang, Tengjie , Li, Wenkai , Ge, Xuehui , Qiu, Ting , Wang, Xiaoda . Kinetics measurement of ethylene-carbonate synthesis via a fast transesterification by microreactors . | CHINESE JOURNAL OF CHEMICAL ENGINEERING , 2023 , 53 , 243-250 . |
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Liquid-liquid slug flow has great application potential in many fields. The effective intensification of mass transfer is an important impetus for its wider application. However, it still lacks a method which can intensify its mass transfer at low flow-rate without slug breakup. Hereon, the periodic expansion microchannel is used to induce the interface deformation of the droplets in slug flow to strengthen mass transfer. Concentration field obtained by experimental analysis, and velocity field obtained through numerical simulation are used to investigate the influence of expansion structure on the mass transfer mechanism of liquid-liquid slug flow. The regulating mechanism of mass transfer is disclosed by investigating the effect of operating conditions on the volumetric mass transfer coefficient kLa and intensification factor E. Optimized E can reach up to 1.5. Introducing expansion structures could intensify the mass transfer of slug flow in a microchannel with low energy consumption.
Keyword ：
Interfacial deformation Interfacial deformation Mass transfer intensification Mass transfer intensification Microchannel Microchannel Periodic expansion Periodic expansion Slug flow Slug flow
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| GB/T 7714 | Han, Yang , Li, Hengbo , Fu, Taotao et al. Mass transfer intensification of slug flow by interfacial deformation at low flow rate in the microchannels with periodic expansion units [J]. | CHEMICAL ENGINEERING SCIENCE , 2023 , 275 . |
| MLA | Han, Yang et al. "Mass transfer intensification of slug flow by interfacial deformation at low flow rate in the microchannels with periodic expansion units" . | CHEMICAL ENGINEERING SCIENCE 275 (2023) . |
| APA | Han, Yang , Li, Hengbo , Fu, Taotao , Liu, Dayu , Wang, Xiaoda . Mass transfer intensification of slug flow by interfacial deformation at low flow rate in the microchannels with periodic expansion units . | CHEMICAL ENGINEERING SCIENCE , 2023 , 275 . |
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Cylcohexanol is an essential bulk chemical that can be produced via cyclohexene hydration, a liquidliquid two-phase reaction that is limited by the low reaction rate and the equilibrium conversion. Adding an appropriate solvent is the most promising method to break through these limitations. However, in previous works the solvent was almost blindly selected without a global consideration. In this work, a rational multiscale method is proposed for the effective selection of an economical and sustainable solvent for the direct hydration of cyclohexene. At the molecular scale, liquid-liquid phase equilibrium was estimated using group contribution methods to rapidly screen the potential solvent candidates from a range of organics, based on the partition coefficient. At the reactor scale, the candidates were experimentally investigated to pick out the solvents that could significantly improve the conversion, without introducing side reactions or deactivating the catalyst. At the process scale, the total annual cost (TAC), CO2 emission, and other metrics were calculated to evaluate the eco-efficiency of all solvents. Using this multi-scale method, acetophenone was selected as an eco-efficient solvent from over 100 organics, resulting in the reduction of TAC by 8 % and CO2 emission by 17 % in the production process. Using acetophenone also led to the increase of cyclohexanol yield from 12.3 % to 27.6 % without the occurrence of side reactions and catalyst deactivation. & COPY; 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keyword ：
Cyclohexene Cyclohexene Hydration Hydration Multi -scale Multi -scale Process analysis Process analysis Solvent selection Solvent selection
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| GB/T 7714 | Wang, Xiaoda , Zhao, Yuqing , Han, Lumin et al. The quest for a better solvent for the direct hydration of cyclohexene: From molecular screening to process design [J]. | CHEMICAL ENGINEERING SCIENCE , 2023 , 274 . |
| MLA | Wang, Xiaoda et al. "The quest for a better solvent for the direct hydration of cyclohexene: From molecular screening to process design" . | CHEMICAL ENGINEERING SCIENCE 274 (2023) . |
| APA | Wang, Xiaoda , Zhao, Yuqing , Han, Lumin , Li, Ling , Kiss, Anton A. . The quest for a better solvent for the direct hydration of cyclohexene: From molecular screening to process design . | CHEMICAL ENGINEERING SCIENCE , 2023 , 274 . |
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The monodispersity of droplet generation in parallel microchannels is critical for particle synthesis, chemical reactions, and separations. The mesoscale concept of compromise in competition is critical to reveal complex changes in the dominant mechanisms during droplet formation. In this paper, the uniformity and fluid distri-bution mechanism of droplet generation in a step-emulsification microdevice with 10 parallel microchannels are investigated by a high-speed camera. It is found that the spontaneous breakup of droplets dominated by interface tension is conducive to the uniform generation of droplets, and the feedback effect of droplet swarms in the cavity reduce the monodispersity of droplets. The pressure drop model in parallel microchannels is constructed. Compromise in competition between microchannels in energy storage phenomenon is analyzed, and the influ-ence of hydrodynamic feedback effect of droplet swarms and the compromise in competition on fluid distribution is explained. The dripping region are improved through the strategy of expelling the droplet swarms by gravity, and droplets with coefficients of variation below 2% are prepared. Finally, a semi-empirical prediction model of droplet size is established.
Keyword ：
Droplet swarm Droplet swarm Mesoscale Mesoscale Microchannel Microchannel Numbering-up Numbering-up Step-emulsification Step-emulsification
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| GB/T 7714 | He, Chengxiang , Jiang, Bin , Zhan, Wei et al. Mesoscale effect on droplet formation in a step-emulsification microdevice with parallel microchannels [J]. | CHEMICAL ENGINEERING JOURNAL , 2023 , 454 . |
| MLA | He, Chengxiang et al. "Mesoscale effect on droplet formation in a step-emulsification microdevice with parallel microchannels" . | CHEMICAL ENGINEERING JOURNAL 454 (2023) . |
| APA | He, Chengxiang , Jiang, Bin , Zhan, Wei , Li, Shouchuan , Wang, Xiaoda , Zhu, Chunying et al. Mesoscale effect on droplet formation in a step-emulsification microdevice with parallel microchannels . | CHEMICAL ENGINEERING JOURNAL , 2023 , 454 . |
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文章在分析化工原理实验考核现状的基础上，基于OBE理念制定了化工原理实验课程目标，对化工原理实验预习、实验操作、实验报告、期末笔试等四个教学环节的考核内容进行重新设计，以期达到以考促教、以考促学的目的，同时支撑工程教育专业认证中毕业要求指标点的达成。
Keyword ：
OBE理念 OBE理念 化工原理实验 化工原理实验 工程教育认证 工程教育认证 考核 考核 能力培养 能力培养
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| GB/T 7714 | 张孟佳 , 王晓达 , 蔡国辉 et al. 支撑工程教育专业认证的化工原理实验考核内容设计 [J]. | 化工高等教育 , 2023 , 40 (05) : 111-115,156 . |
| MLA | 张孟佳 et al. "支撑工程教育专业认证的化工原理实验考核内容设计" . | 化工高等教育 40 . 05 (2023) : 111-115,156 . |
| APA | 张孟佳 , 王晓达 , 蔡国辉 , 施小芳 , 叶长燊 , 李玲 . 支撑工程教育专业认证的化工原理实验考核内容设计 . | 化工高等教育 , 2023 , 40 (05) , 111-115,156 . |
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本发明公开了一种利用光响应性三相乳液实现微流控串联反应的方法，将光响应性三相乳液作为一种液滴微反应器实现了缩合‑还原串联反应，该方法基于三相乳液结构的可重构特性，通过一种光响应性偶氮苯表面活性剂使三相乳液在紫外光照射下可以由核壳型结构转变为Janus型结构。然后利用这一特性和玻璃毛细管微流控芯片结合，设计了一种微流控串联反应系统，使本不可以存在于同一反应环境内的缩合和还原反应可以在不需要任何中间操作下转化率达到95%以上。该方法相比与传统的间歇反应，具有连续化，易于调控和反应快速等优点，是一种高效，绿色，节能的方法。
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| GB/T 7714 | 葛雪惠 , 莫樑基 , 王晓达 et al. 一种利用光响应性三相乳液实现微流控串联反应的方法 : CN202210282700.9[P]. | 2022-03-22 00:00:00 . |
| MLA | 葛雪惠 et al. "一种利用光响应性三相乳液实现微流控串联反应的方法" : CN202210282700.9. | 2022-03-22 00:00:00 . |
| APA | 葛雪惠 , 莫樑基 , 王晓达 , 黄智贤 , 叶长燊 , 邱挺 . 一种利用光响应性三相乳液实现微流控串联反应的方法 : CN202210282700.9. | 2022-03-22 00:00:00 . |
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