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学者姓名：严佐毅
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Abstract ：
The low efficiency of growing single-walled carbon nanotubes (SWCNT) poses a barrier to their application in high-performance electronic devices. However, it is difficult to control the uniform growth of SWCNT in a floating catalytic reactor due to the complex parameter control. Therefore, it is essential to enhance the growth of SWCNT in the floating catalyst chemical vapor deposition (FCCVD) process. In the present work, the influence of the reactive flow field on the growth of SWCNT, which is often neglected, is revealed. To address this issue, this work combines experiments and simulations to obtain the characteristics of the field distribution within the reactor and the trend of the products. The results of the flow field analysis indicate that thermal buoyancy is the cause of SWCNT growth limitation in FCCVD. By weakening the thermal buoyancy, a homogeneous reaction field is obtained; vortices in the flow field are reduced or even disappear; the temperature field is more homogeneous, and, importantly, the crystallinity of SWCNT is enhanced (IG/ID up to 20-fold). In addition, the decomposition process of the carbon source is also enhanced, thus suppressing the generation of by-products. Based on the results of the small tube experiments, both the increase in temperature and the decrease in residence time increased the IG/ID. Furthermore, the distributions of the maximum and minimum diameters in SWCNT imply variations in the growth modes of SWCNT at different temperatures. © 2024 Elsevier B.V.
Keyword ：
Buoyancy Buoyancy Catalysts Catalysts Chemical vapor deposition Chemical vapor deposition Crystallinity Crystallinity Flow fields Flow fields Residence time distribution Residence time distribution Single-walled carbon nanotubes (SWCN) Single-walled carbon nanotubes (SWCN)
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| GB/T 7714 | Yu, Guo , Han, Peilin , Yi, Hongmei et al. Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT [J]. | Diamond and Related Materials , 2024 , 145 . |
| MLA | Yu, Guo et al. "Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT" . | Diamond and Related Materials 145 (2024) . |
| APA | Yu, Guo , Han, Peilin , Yi, Hongmei , Zhao, Jiaxiang , Hou, Songjia , Yan, Zuoyi et al. Study of field distribution characteristics in CVD reactors and enhanced growth of SWNCT . | Diamond and Related Materials , 2024 , 145 . |
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The efficient capture of CO2 has always been a goal pursued by people. However, low gas handling capacity and low gas-liquid ratio restricts existing gas-liquid contactors, especially for non-rotating ones. In this study, a gas-liquid contactor with high gas handling capacity and high gas-liquid ratio, the rotating spiral contactor, was developed. Hydrodynamic properties of the contactor were experimentally or theoretically investigated. A novel interface model was developed to describe gas-liquid interface shape. CO2 capture using MEA/DMEA aqueous solution were evaluated in terms of space-time yield (tau), overall volumetric mass transfer coefficient (KGae) and CO2 capture efficiency (eta). A rate -based model was developed and applied for the first time to predict CO2 capture in the rotating spiral contactor. The hydrodynamic results showed that liquid layer thickness was below 400 mu m for the liquid with viscosity of 14.5 mPa.s. Under the rotational speed of 1200 rpm, the gas-liquid ratio ranged from 525 to 2700, while the gas-liquid surface area remained around 667 m2/m3. The interface model predicted interface thickness within a relative deviation of +/- 20 %. The results also showed that tau, KGae and eta respectively were 3428-17021 h-1, 1.0-6.4 kmol.m- 3.h-1.kPa- 1 and 38-98 % at the gas-liquid ratio range of 200-1000. The predicted KGae and eta by rate -based model agreed well with the experimental data within a relative deviation of +/- 15 %. This rotating spiral contactor is ideally suitable for the scenarios with large gas handling requirement and high gas-liquid ratio.
Keyword ：
CO2 capture CO2 capture High gas-liquid ratio High gas-liquid ratio Interface model Interface model Mass transfer coefficient Mass transfer coefficient Rate-based model Rate-based model Rotating spiral contactor Rotating spiral contactor
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| GB/T 7714 | Chen, Tianming , Zheng, Meiqin , Zheng, Chenghui et al. CO2 capture in a novel rotating spiral contactor with hydraulic seal: Hydromechanics, mass transfer and modeling [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 340 . |
| MLA | Chen, Tianming et al. "CO2 capture in a novel rotating spiral contactor with hydraulic seal: Hydromechanics, mass transfer and modeling" . | SEPARATION AND PURIFICATION TECHNOLOGY 340 (2024) . |
| APA | Chen, Tianming , Zheng, Meiqin , Zheng, Chenghui , Yan, Zhongyi , Yan, Zuoyi , Zhou, Caijin et al. CO2 capture in a novel rotating spiral contactor with hydraulic seal: Hydromechanics, mass transfer and modeling . | SEPARATION AND PURIFICATION TECHNOLOGY , 2024 , 340 . |
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The Microscale Oscillatory Flow Reactor (MOFR) can achieve good plug flow and micromixing performance simultaneously at laminar net flow conditions. An unbaffled U-shaped microreactor coupled with oscillating flow technology was designed to study the macro and micromixing performance. Firstly, the influence of oscillations on the flow performance was studied to reveal the formation rule of vortex. The simulation results showed that the continuous formation and destruction of periodic vortexes occurred in the microreactor with oscillation. With the increase of oscillation intensity, the vortex size in the radial direction first gradually increased and then becomes stable, and gradually moved axially, resulting in axial diffusion. Secondly, the effect of oscillation on the macromixing and micromixing performance were investigated. The results showed that the coupling oscillation could greatly improve the macromixing and micromixing performance. The macromixing and micromixing performance were promoted simultaneously at lower oscillation intensity and then tended to be flat due to the axial diffusion at high oscillation intensity. When φ>6.05, the minimum micromixing time and the maximum number of tanks can be achieved at the same time. At a velocity ratio of about 23, FoM reached a maximum of about 3.5. © 2024
Keyword ：
Computational fluid dynamics Computational fluid dynamics Diffusion Diffusion Laminar flow Laminar flow Oscillating flow Oscillating flow Vortex flow Vortex flow
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| GB/T 7714 | Yu, Liping , Zheng, Meiqin , Wang, Jiawei et al. Enhanced mixing characteristics of unbaffled U-shaped microreactor coupled oscillatory flow [J]. | Chemical Engineering and Processing - Process Intensification , 2024 , 205 . |
| MLA | Yu, Liping et al. "Enhanced mixing characteristics of unbaffled U-shaped microreactor coupled oscillatory flow" . | Chemical Engineering and Processing - Process Intensification 205 (2024) . |
| APA | Yu, Liping , Zheng, Meiqin , Wang, Jiawei , Yan, Zuoyi , Yao, Wei , Li, Haohong et al. Enhanced mixing characteristics of unbaffled U-shaped microreactor coupled oscillatory flow . | Chemical Engineering and Processing - Process Intensification , 2024 , 205 . |
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The de-oiling of concentrated phospholipids through ultrafiltration (UF) enhanced by reversed micelles using a polyethersulfone (PES) membrane was examined. Phospholipids could form reversed micellar structures with larger molecular weights in non-polar solvents, which were significantly different from oils and solvents with smaller molecular weights confirming the feasibility of membrane separation. Under the conditions of membrane retentate molecular weight of 50 kDa, transmembrane pressure difference of 0.30 MPa, inlet crossflow velocity of 2.78 x 10(-4) m.s(-1), temperature of 333.15 K, phospholipid feed concentration of 26.12 kg.m(-3)% and cycle ratio of 20:1, the retentate phospholipid content and phospholipid yield were 84.97% and 96.4%, respectively, and the permeate flux was 4.65 x 10(-6) m.s(-1). Phospholipids increased the hydrophobicity of the membrane surface and promoted concentrated phospholipid de-oiling. Finally, a mathematical model was established based on the twodimensional concentration polarization mechanism indicating that permeate flux was mainly controlled by the convective transfer flow rate.
Keyword ：
Concentrated phospholipids Concentrated phospholipids De-oiling De-oiling Mathematical model Mathematical model Reversed micelles Reversed micelles
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| GB/T 7714 | Yan, Zuoyi , Zheng, Meiqin , Ye, Daohang et al. Reversed micellar-enhanced ultrafiltration removal of oil from concentrated phospholipids [J]. | CHEMICAL ENGINEERING SCIENCE , 2023 , 277 . |
| MLA | Yan, Zuoyi et al. "Reversed micellar-enhanced ultrafiltration removal of oil from concentrated phospholipids" . | CHEMICAL ENGINEERING SCIENCE 277 (2023) . |
| APA | Yan, Zuoyi , Zheng, Meiqin , Ye, Daohang , Qi, Tian , Zhou, Caijin , Zheng, Huidong . Reversed micellar-enhanced ultrafiltration removal of oil from concentrated phospholipids . | CHEMICAL ENGINEERING SCIENCE , 2023 , 277 . |
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Background: Unbaffled U-shaped mesoscale oscillatory flow reactors (meso-OFRs) are able to achieve low pressure drop, good plug flow and micromixing performance simultaneously at laminar net flow conditions under a wide "operating windows".Method: We focus on the macromixing and micromixing behaviours of unbaffled meso-OFR, where the net flow and oscillation conditions were in the wide range of Ren=17-51 and Reo=16-1350, respectively.Significant findings: The good plug flow and micromixing performance could be achieved simultaneously at low oscillation intensity with the wide "operating windows" of psi<47. It was believed that oscillatory motion led to periodic destruction and reformation of vortices, as the oscillation intensity increased, the large-scale vortices were decomposed into small-scale vortices, resulting in backmixing or axial dispersion. Meanwhile, the empirical formula of micromixing time and velocity ratio in accordance with the power-law relationship was established: tm/t = 0.00277 psi 0.51658. Finally, the oscillatory mechanism was qualitatively validated by Computational Fluid Dynamics (CFD).
Keyword ：
CFD CFD Macromixing Macromixing Meso-OFR Meso-OFR Micromixing Micromixing Vortices Vortices
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| GB/T 7714 | Zheng, Meiqin , Yao, Wei , Tian, Linda et al. Characterization of macromixing and micromixing performance of unbaffled U-shaped mesoscale oscillatory flow reactor [J]. | JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS , 2023 , 145 . |
| MLA | Zheng, Meiqin et al. "Characterization of macromixing and micromixing performance of unbaffled U-shaped mesoscale oscillatory flow reactor" . | JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS 145 (2023) . |
| APA | Zheng, Meiqin , Yao, Wei , Tian, Linda , Zhao, Suying , Zhou, Caijin , Zheng, Huidong et al. Characterization of macromixing and micromixing performance of unbaffled U-shaped mesoscale oscillatory flow reactor . | JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS , 2023 , 145 . |
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Unbaffled U-shaped mesoscale oscillatory flow reactors (meso-OFRs) were developed to prevent solid deposition and prepare uniform barium sulfate (BaSO4) nanoparticles with environmental protection function. The results showed that the oscillation significantly reduced granular deposition; the greater the intensity of the oscillation, the faster it reached uniformity, and the less likely the granules were to be deposited. These results can be explained by the formation of a larger vortex size, which can strengthen the turbulent mixing of fluid in the reactor, promote the interaction and forced mixing between the liquid phase and solid particles, enhance the internal shear stress of the fluid, and contribute to the secondary suspension of solid particles and the disintegration of particle agglomeration. The prepared BaSO4 nanoparticles with oscillation were smaller in size and lower in pressure drop than those produced without oscillation, which conclusively illustrated that oscillation effectively prevented channel deposition and clogging.
Keyword ：
BaSO 4 nanoparticles BaSO 4 nanoparticles Granular deposition Granular deposition Liquid -solid two-phase flow Liquid -solid two-phase flow Meso-OFR Meso-OFR Vortex Vortex
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| GB/T 7714 | Zheng, Meiqin , Liu, Jianchen , Tian, Linda et al. Unbaffled mesoscale reactor coupled oscillatory flow-enhanced liquid-solid two-phase flow [J]. | POWDER TECHNOLOGY , 2023 , 434 . |
| MLA | Zheng, Meiqin et al. "Unbaffled mesoscale reactor coupled oscillatory flow-enhanced liquid-solid two-phase flow" . | POWDER TECHNOLOGY 434 (2023) . |
| APA | Zheng, Meiqin , Liu, Jianchen , Tian, Linda , Yan, Zuoyi , Zhou, Caijin , Li, Haohong et al. Unbaffled mesoscale reactor coupled oscillatory flow-enhanced liquid-solid two-phase flow . | POWDER TECHNOLOGY , 2023 , 434 . |
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本发明提出一种停留时间可控的连续流反应器及其设计、使用方法，包括：旋转轴和围绕旋转轴固定设置的首尾相连的n个腔室通道。实现了离心力场与微(毫)通道的结合。通过微通道的结构设计扩大了传递界面；并通过离心力场作用，使得在净流速较小甚至为零时，通道内可产生涡流，实现了较好的混合效果；通过设计通道结构，可控制通道内停留时间；通过简单的纵向堆叠和串联，可以容易实现连续流。该反应器对于高粘度物料的处理效果尤为明显。
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| GB/T 7714 | 严佐毅 , 朱晓磊 , 郑辉东 . 停留时间可控的连续流反应器及其设计、使用方法 : CN202210354279.8[P]. | 2022-04-06 00:00:00 . |
| MLA | 严佐毅 et al. "停留时间可控的连续流反应器及其设计、使用方法" : CN202210354279.8. | 2022-04-06 00:00:00 . |
| APA | 严佐毅 , 朱晓磊 , 郑辉东 . 停留时间可控的连续流反应器及其设计、使用方法 : CN202210354279.8. | 2022-04-06 00:00:00 . |
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In order to study the floating and heat transfer characteristics of catalyst particles in oscillating flow reactor (OFR), a self-made OFR device was employed to measure the floating velocity and heat transfer coefficient under different operating conditions and solid volume fractions (Re-n: 203-1008, Re-o: 269-3307, alpha(s): 5%-20%), and the corresponding mathematical models were proposed. The results shown that oscillatory force had a high corre-lation with the solid phase volume fraction in OFR, and the floating velocities in OFR were obtained by ex-periments and models respectively. Compared with other drag force models, the Gidaspow and Arastoopour model can better describe the force between catalyst particles and liquid in OFR. The heat transfer coefficient increased first and then decreased with increasing oscillatory intensity, and it decreased with increasing solid volume fraction. The predicted values of floating velocity U-f and heat transfer coefficient h(OFR) were compared with the experimental data, and the results shown that most of relative errors of U-f and h(OFR) are within the range of 20% and 30% respectively in this paper. The research results provide basic data and theoretical base for the industrial application of OFR.
Keyword ：
Floating velocity Floating velocity Heat transfer Heat transfer Mathematical model Mathematical model Oscillating flow reactor Oscillating flow reactor Oscillatory force Oscillatory force
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| GB/T 7714 | Yan, Zhongyi , Lu, Chengyan , Zhuang, Junjie et al. Characteristics of particle floating and heat transfer in an oscillating flow reactor [J]. | CHEMICAL ENGINEERING JOURNAL , 2022 , 427 . |
| MLA | Yan, Zhongyi et al. "Characteristics of particle floating and heat transfer in an oscillating flow reactor" . | CHEMICAL ENGINEERING JOURNAL 427 (2022) . |
| APA | Yan, Zhongyi , Lu, Chengyan , Zhuang, Junjie , Chen, Tianming , Zheng, Huidong , Yan, Zuoyi . Characteristics of particle floating and heat transfer in an oscillating flow reactor . | CHEMICAL ENGINEERING JOURNAL , 2022 , 427 . |
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Walnut oil production waste (WOPW) is a by-product of walnut oil processing. The organic waste is rich in holocellulose and lignin, showing good potential to be converted by thermal process to valuable products. Superheated steam (SHS) torrefaction isa recently proposed thermal process enabling fast and unformal biomass heating, resulting in high-quality solid products as direct fuel. The potential of SHS to torrefy lipids and proteins (being rich in WOPW) is attractive for broader application of SHS torrefaction to upgrade more biomass wastes. SHS torrefaction was studied in this work to upgrade WOPW for solid products with different reaction temperatures (200, 250, 300 degrees C) and residence times (20, 40, 60 min). The lowest weight yield was 43.64 wt% under the severest treatment of 300 degrees C and 60 min, accompanied with the highest energy enhancement of 1.34 (reaching HHV of 27.03 MJ/kg). Response surface method is employed to reveal the effects of temperature and residence time. Residence time of 40 min under 300 degrees C was sup-posed to be an ideal condition to upgrade WOPW with HHV of 26.68 MJ/kg and in the range of coal from Van Krevelen diagram. Combustion indices (e.g., fuel ratio, combustion index, and volatile ignitability) indicated that the aforemen-tioned torrefied WOPW had favourable properties as co-firing material. On the other hand, combustion behaviours analysis demonstrated that SHS torrefied WOPW could perform well as direct fuel. Aqueous effiuent was also con-densed and analyzed, where products from lipids and proteins were massively presented, giving an insight into the de-composition of those two constitutes undergoing SHS torrefaction.
Keyword ：
Combustion behaviours Combustion behaviours Fuel property Fuel property Superheated steam torrefaction Superheated steam torrefaction Walnut oil processing wastes Walnut oil processing wastes
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| GB/T 7714 | Zhang, Dongdong , Han, Peilin , Zheng, Huidong et al. Torrefaction of walnut oil processing wastes by superheated steam: Effects on products characteristics [J]. | SCIENCE OF THE TOTAL ENVIRONMENT , 2022 , 830 . |
| MLA | Zhang, Dongdong et al. "Torrefaction of walnut oil processing wastes by superheated steam: Effects on products characteristics" . | SCIENCE OF THE TOTAL ENVIRONMENT 830 (2022) . |
| APA | Zhang, Dongdong , Han, Peilin , Zheng, Huidong , Yan, Zuoyi . Torrefaction of walnut oil processing wastes by superheated steam: Effects on products characteristics . | SCIENCE OF THE TOTAL ENVIRONMENT , 2022 , 830 . |
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Background: Advanced-Flow Reactor (AFR) can produce excellent mixing and is proven to be highly efficient and easy to expand, which is closely related to the fluid flow characteristics. Method: The visualization experimental study was carried out to study the behavior and mechanism of the bubble breakup in a single Corning G1 module. Significant findings: The results showed that the breakup behavior in AFR had a significant regularity at low Reynolds numbers (Re < 1000). The breakup behavior was closely related to the capillary number Ca and the virtual length l(0) of bubbles, and the criterions was also obtained. Most of bubbles in arc-shaped junction divergence of AFR were breakup with permanent obstruction (POB), which could be divided into two stages: squeezing stage and rapid pinch-off stage. The modified equation obtained in this paper can roughly describe the change of the bubble neck at the squeezing stage of POB. The research results provide a theoretical basis for industrial application of AFR and the development of next-generation reactors.
Keyword ：
AFR AFR Breakup Breakup Bubble Bubble Low Reynolds numbers Low Reynolds numbers Mechanisms Mechanisms
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| GB/T 7714 | Zheng, Meiqin , Li, Huan , Chen, Chun et al. Breakup of bubbles in Advanced-Flow Reactor at low Reynolds numbers [J]. | JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS , 2022 , 139 . |
| MLA | Zheng, Meiqin et al. "Breakup of bubbles in Advanced-Flow Reactor at low Reynolds numbers" . | JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS 139 (2022) . |
| APA | Zheng, Meiqin , Li, Huan , Chen, Chun , Chen, Tianming , Zou, Wenyi , Zheng, Huidong et al. Breakup of bubbles in Advanced-Flow Reactor at low Reynolds numbers . | JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS , 2022 , 139 . |
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