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Editorial for the Special Issue on Frontiers of Chemical Engineering
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作者 Jesse Zhu Junwu Wang 《Engineering》 SCIE EI 2021年第1期1-2,共2页
The Eleventh Global Chinese Chemical Engineers Symposium(GCCES-11)was held on August 2–5,2019,in Chengdu,China,organized by the School of Chemical Engineering of Sichuan University.The GCCES is a prestigious and worl... The Eleventh Global Chinese Chemical Engineers Symposium(GCCES-11)was held on August 2–5,2019,in Chengdu,China,organized by the School of Chemical Engineering of Sichuan University.The GCCES is a prestigious and world-wide academic exchange platform organized by the Global Academy of Chinese Chemical Engineers(GACCE),for chemical engineers and scientists interested in innovation and professional development to gather,exchange ideas,and make friends.It focuses on a wide range of topics relevant to cutting-edge research,new technologies,and areas of emerging growth in chemical engineering and science.The GCCES strongly promotes international academic exchanges and collaborations,facilitates cross-disciplinary integration and industrial-academic research co-operation,and encourages the professional development of young Chinese chemical engineers and scientists on the world stage. 展开更多
关键词 PROFESSIONAL ENGINEER ORGANIZED
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Measurement of inter-particle forces by an interfacial force microscope 被引量:1
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作者 Qing Huang Asghar Mesbah-Nejad +3 位作者 Seyed M. Tadayyon Peter Norton Hui Zhang Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2010年第5期400-406,共7页
An interfacial force microscope (IFM) was employed to measure the inter-particle forces between two individual glass beads with diameters varying from 8 to 20 μm. With the feedback function of IFM turned off, attra... An interfacial force microscope (IFM) was employed to measure the inter-particle forces between two individual glass beads with diameters varying from 8 to 20 μm. With the feedback function of IFM turned off, attractive forces were obtained. The forces varied in the range of 0.1-0.34 μN, and their validity was confirmed by a theoretical analysis of the van der Waals force between the same glass beads. With the feedback function switched on, no attractive forces between particles were detected by the IFM when the probe approached the sample substrate. This may be attributed to the dramatic change of the attractive forces within a very short separation distance and/or the relatively poor signal-to-noise ratio of the IFM. 展开更多
关键词 Inter-particle forcesvan der Waals forceInterracial force microscopeFine powder
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Modified correlation for minimum fluidization velocity of low-density particles in inverse liquid-solid fluidized beds
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作者 Michael Nelson Saleh Srabet +2 位作者 Tian Nan Dominic Pjontek Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2022年第12期56-62,共7页
The minimum fluidization velocity(U_(mf))is a key parameter for the scale-up of inverse liquid-solid flu-idized beds.Theoretical predictions using common correlations were compared against experimental minimum fluidiz... The minimum fluidization velocity(U_(mf))is a key parameter for the scale-up of inverse liquid-solid flu-idized beds.Theoretical predictions using common correlations were compared against experimental minimum fluidization velocity measurements of low density(28-638 kg/m^(3)),0.80-1.13 mm Styrofoam particles in a fluidized bed with a height of 4.5 m and 0.2 m diameter.The average absolute relative deviation for the predicted minimum fluidization velocity for particles below 300 kg/m^(3) was above 40%using the studied common correlations.A modified Wen and Yu correlation was thus proposed based on novel and past measurements with low-density and small-diameter particles,expanding the range for predicting U_(mf).The new correlation predicted U_(mf) with deviations below 15%for ST028,ST122 and ST300.This modified correlation also improved U_(mf) predictions for comparable particles from a previous study,demonstrating its validity for a larger range of low-density particles. 展开更多
关键词 Liquid-solid fluidization Inverse fluidization Minimum fluidization velocity Low-density particles
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Cluster identification using image processing 被引量:8
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作者 Jingsi Yang Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2015年第6期16-24,共9页
By closely examining hue, saturation and value (HSV) images of the solids holdup distribution in a riser, it can be seen that a "cluster" is the combination of a relatively stable core cluster of the highest solid... By closely examining hue, saturation and value (HSV) images of the solids holdup distribution in a riser, it can be seen that a "cluster" is the combination of a relatively stable core cluster of the highest solids holdups and constantly changing cluster clouds of solids holdups that are higher than the dilute phase. Based on this analysis, a threshold selection method maximizing the inter-class variance between the background and foreground classes is introduced. A systematic cluster identification process is therefore proposed that: (|) applies the threshold selection method to obtain the critical solids holdup threshold ~c to discriminate dense and dilute phases and (2) applies the method again in the dense phase regions to obtain the cluster solids holdup threshold Ssct that identifies the core clusters. Using this systematic process, clusters of different shapes and sizes and a relatively clear boundary can be visualized clearly and identified accurately. Using ~sct, the core cluster fraction is calculated by dividing the total number of pixels in the core cluster by the total number of image pixels. The variation of the core cluster fraction according to operating conditions is also discussed. 展开更多
关键词 Cluster identification Image processingCluster fractionRectangular circulating fluidized bed riser
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Experimental study on reactor performance of gas-solids low-velocity fluidized beds 被引量:2
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作者 Jiangshan Liu Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2022年第7期21-28,共8页
Reactor performance of bubbling fluidized bed(BFB)and turbulent fluidized bed(TFB)was carefully examined and systematically compared using catalytic ozone decomposition as a model reaction,based on a complete mapping ... Reactor performance of bubbling fluidized bed(BFB)and turbulent fluidized bed(TFB)was carefully examined and systematically compared using catalytic ozone decomposition as a model reaction,based on a complete mapping of local flow structures and spatial distributions of ozone conversion and solids holdup.TFB clearly has a higher conversion and shows better reactor performance than BFB as a result of the vigorously turbulent flow and the relatively homogeneous gas–solids mixing in TEB.Besides,the intensive interaction between gas and solids in TFB leads to greater gas–solids contact efficiency of TFB over that of BFB.Due to gas bypassing and backmixing caused by bubbling behaviours and two-phase structure,BFB deviates significantly from a plug flow reactor and sometimes from a continuously stirred tank reactor.The flow structures essentially dictate the reactor performance in the low-velocity fluidized beds. 展开更多
关键词 Bubbling fluidized bed Turbulent fluidized bed Conversion distribution Flow structure Reactor performance Gas–solids contact efficiency
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Circulating turbulent fluidization-A new fluidization regime or just a transitional phenomenon 被引量:13
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作者 Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2010年第6期640-644,共5页
While circulating fluidized bed (CFB) reactor has many advantages over the more conventional turbulent fluidized bed (TFB) reactor, it does at least have one significant shortcoming-the rather dilute solids volume... While circulating fluidized bed (CFB) reactor has many advantages over the more conventional turbulent fluidized bed (TFB) reactor, it does at least have one significant shortcoming-the rather dilute solids volume concentration in CFB reactor gives rise to less ideal reaction intensity. On the other hand, while having higher reaction intensity, TFB reactor has one fatal drawback of particle back-mixing, making it not suitable for certain reactions such as catalytic reaction where the catalyst requires frequent regeneration. This paper describes some key issues in the development of a circulating turbulent fluidized bed (CTFB) reactor that combines the advantages of both TFB and CFB, that is, to have the high reaction intensity as in TFB but and also to have a suppressed solids back-mixing as in CFB due to a continuous net upflow of solids flux through the bed. Experimental results show enough evidence to suggest that a new fluidization regime is formed, the characteristics of which appears to be distinct from those observed in a regular TFB and from those in either the bottom or the upper sections of regular CFB and/or high-density CFB (HDCFB). Fundamentally, the difference is that particle-particle interaction (collision) dominates the motion of particles in CTFB and TFB, while gas-particle interaction (drag force) is the key element that determines the two phase flow in CFB including HDCFB. 展开更多
关键词 Circulating-turbulent fluidized bed Flow regime Circulating-turbulent fluidizationTurbulent fluidized bed Circulating fluidized bed
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Separation density prediction of geldart A^(-)dense medium in gas-solid fluidized bed coal beneficiators 被引量:2
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作者 Chenyang Zhou Chengguo Liu +3 位作者 Yue Yuan Zhijie Fu Jesse Zhu Chenlong Duan 《Particuology》 SCIE EI CAS CSCD 2024年第9期251-262,共12页
Gas-solid Fluidized Bed Coal Beneficiator(GFBCB)process is a crucial dry coal beneficiation fluidization technology.The work employs the GFBCB process alongside a novel Geldart A^(-)dense medium,consisting of Geldart ... Gas-solid Fluidized Bed Coal Beneficiator(GFBCB)process is a crucial dry coal beneficiation fluidization technology.The work employs the GFBCB process alongside a novel Geldart A^(-)dense medium,consisting of Geldart A magnetite particles and Geldart C ultrafine coal,to separate small-size separated objects in the GFBCB.The effects of various operational conditions,including the volume fraction of ultrafine coal,the gas velocity,the separated objects size,and the separation time,were investigated on the GFBCB's separation performance.The results indicated that the probable error for 6∼3 mm separated objects could be controlled within 0.10 g/cm^(3).Compared to the traditional Geldart B/D dense medium,the Geldart A/A^(-)dense medium exhibited better size-dependent separation performance with an overall probable error 0.04∼0.12 g/cm^(3).Moreover,it achieved a similar separation accuracy to the Geldart B/D dense medium fluidized bed with different external energy for the small-size object beneficiation.The work furthermore validated a separation density prediction model based on theoretical derivation,available for both Geldart B/D dense medium and Geldart A/A^(-)dense medium at different operational conditions. 展开更多
关键词 GFBCB Geldart A^(-)dense medium Separation density Separated objects size Prediction model
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Citric acid-assisted synthesis of nano-Ag/BiO Br with enhanced photocatalytic activity 被引量:2
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作者 Xiuli Li Xiaoming Mao +5 位作者 Xiaochao Zhang Yunfang Wang Yawen Wang Hui Zhang Xiaogang Hao Caimei Fan 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第3期457-466,共10页
In this study, silver nano-particles have been anchored in the surface of Bi OBr photocatalysts by a citric acid-assisted photoreduction method. The citric acid was served as a chelating and reductive agent for the pr... In this study, silver nano-particles have been anchored in the surface of Bi OBr photocatalysts by a citric acid-assisted photoreduction method. The citric acid was served as a chelating and reductive agent for the preparation of Ag-decorated Bi OBr photocatalysts(named as Ag/Bi OBr-2). The as-synthesized samples were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM), and UV-Vis diffuse reflection spectroscopy(DRS). The Ag/Bi OBr-2 photocatalyst exhibited excellent and stable photocatalytic activities on MO and phenol degradation under simulated sunlight irradiation. The enhanced photocatalytic activity could be ascribed to the smaller size, rough surface, and the surface plasma resonance(SPR) effect of Ag. Also, the Schottky junction, between the surface of the Bi OBr and silver nanoparticles, accelerated the efficient transfer and separation of photoinduced electron-hole pairs and promoted the photocatalytic performance. The active species tests indicated that the superoxide radical(·O-2) was responsible for the enhanced photocatalytic performance of Ag/Bi OBr-2. Finally, a possible photocatalytic mechanism was proposed. 展开更多
关键词 Ag/Bi OBr citric acid PHOTOREDUCTION PHOTOCATALYSIS
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Hydrodynamics in a new liquid–solid circulating conventional fluidized bed 被引量:1
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作者 Jingya Fu Xinyu Pan +3 位作者 Zeneng Sun Ruoting Liu Ying Zheng Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2022年第11期20-29,共10页
A new type of liquid–solid fluidized bed,named circulating conventional fluidized bed(CCFB)which operates below particle terminal velocity was proposed and experimentally studied.The hydrodynamic behavior was systema... A new type of liquid–solid fluidized bed,named circulating conventional fluidized bed(CCFB)which operates below particle terminal velocity was proposed and experimentally studied.The hydrodynamic behavior was systematically studied in a liquid–solid CCFB of 0.032 m I.D.and 4.5 m in height with five different types of particles.Liquid–solid fluidization with external particle circulation was experimentally realized below the particle terminal velocity.The axial distribution of local solids holdup was obtained and found to be fairly uniform in a wide range of liquid velocities and solids circulation rates.The average solids holdup is found to be significantly increased compared with conventional fluidization at similar conditions.The effect of particle properties and operating conditions on bed behavior was investigated as well.Results show that particles with higher terminal velocity have higher average solids holdup. 展开更多
关键词 Circulating conventional fluidized bed(CCFB) Solids holdup Solids circulation rate Superficial liquid velocity Particle properties Operating conditions
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Flow properties of fine powders in powder coating 被引量:4
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作者 Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2010年第1期19-27,共9页
Three types of nanoparticles and their combinations were blended into a fine powder, which has been used in the powder coating industry. To study their effects on flow properties, the modified powder samples were char... Three types of nanoparticles and their combinations were blended into a fine powder, which has been used in the powder coating industry. To study their effects on flow properties, the modified powder samples were characterized using a variety of techniques that tested the powder under different powder states ranging from dynamic to static. It was found that all three nanoparticles improved the flow properties of the powder to some degree, though the amounts of the nanoparticles needed were different depending on their physical properties. Secondly, inconsistency among these powder characterization techniques was also found. This is attributed to the different states of the powder samples during a measurement including dynamic, dynamic-static and static states. It was confirmed that characterization techniques which test the flow properties of a powder under all three states are needed to fully describe the flow properties of the powder. Finally, the effects of combinations of nanoparticles were explored, and it was found that combinations of nanoparticles can intensify, weaken or combine the effects of their component nanoparticles. The effects of nanoparticle combinations are not a simple summation of the effects of their comnonent nanoparticles. 展开更多
关键词 Fine powders Nanoparticle Flow property Flow property characterization Powder coating
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Effects of internals and distributors on the distribution and growth of bubbles in the conventional gas-solid fluidized bed 被引量:1
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作者 Haidong Zhang Zeneng Sun +3 位作者 Chengguo Liu Shurui Dong Yuanyuan Shao Jesse Zhu 《Particuology》 SCIE EI CAS CSCD 2021年第2期1-15,共15页
The effects of internals and gas distributors on the local dynamics of the bubbles in the conventional gas-solid fluidized bed were studied.Mesh-type internals with different opening areas(50%,70%and 90%)and different... The effects of internals and gas distributors on the local dynamics of the bubbles in the conventional gas-solid fluidized bed were studied.Mesh-type internals with different opening areas(50%,70%and 90%)and different arrangements(two-layer and four-layer);and a sintered plate with a smaller pore size(1μm)and a perforated plate with a larger pore size as distributors were investigated.Differential pressure drops and local solids holdups were measured under various superficial gas velocities to compare the performances of the different types of internals and distributors.The instantaneous solids holdup signals from the optical fibre probe were used to further examine the local bubble dynamics in detail.Smaller bubbles were found,with the installation of internals or using the sintered plate,resulting in lower pressure drops and a higher bed expansion.Internals with reduced opening area or distributor with smaller pore size further leads to a higher changeover rate between the bubbles and dense phase,both axially and radially,and hence a better gas-solid contacting and an earlier transition to the turbulent flow regime of the bed. 展开更多
关键词 Gas-solid fluidized bed INTERNAL Gas distributor Bubble dynamics Flow regime transition
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An update on electrostatic powder coating for pharmaceuticals 被引量:4
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作者 Qingliang Yang Yingliang Ma +2 位作者 Jesse Zhu Kwok Chow Kaiqi Shi 《Particuology》 SCIE EI CAS CSCD 2017年第2期1-7,共7页
Derived from dry powder coating of metals, electrostatic powder coating for pharmaceuticals is a technology for coating drug solid dosage forms. In this technology, coating powders, containing coating polymers, pigmen... Derived from dry powder coating of metals, electrostatic powder coating for pharmaceuticals is a technology for coating drug solid dosage forms. In this technology, coating powders, containing coating polymers, pigments, and other excipients, are directly sprayed onto the surface of the solid dosage forms through an electrostatic gun without using any organic solvent or water. The deposited coating powders are further cured to form a coating film. Electrostatic powder coating technology has many advantages compared to other pharmaceutical coating methods. It can eliminate the limitations caused by the organic solvent in solvent coating such as environmental issues and health problems. And electrostatic powder coating technology also surpasses aqueous coating due to its shorter processing time and less energy consumption, leading to a lower overall cost. Furthermore, the utilization of electrical attraction can promote the movement of coating powders towards the substrate, leading to an enhanced coating powder adhesion and coating efficiency, which make it more promising compared to other dry coating technologies. The objective of this review is to summarize the coating principles, apparatus, and formulations of different electrostatic powder coating technologies, giving their advantages and limitations and also analyzing the future application in the industry for each technology 展开更多
关键词 Electrostatic powder coating Solid dosage forms Plasticizers Powder adhesion Film formation Curing
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Special Issue for the Future Chemical Engineering Scholars of Global Chinese Chemical Engineering Symposium
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作者 Jesse Zhu Junwu Wang 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2022年第6期775-776,共2页
The Global Chinese Chemical Engineering Symposium(GCCES)is a prestigious and world-wide platform for the communication and academic exchange of chemical science and engineering.In addition to its key roles in internat... The Global Chinese Chemical Engineering Symposium(GCCES)is a prestigious and world-wide platform for the communication and academic exchange of chemical science and engineering.In addition to its key roles in international academic exchanges and collaborations,as well as cross-disciplinary integration and industrial-academic co-operation,the GCCES strongly promotes the professional development of young Chinese chemical engineers and scientists by founding series of special forums for the winners of the Excellent Postgraduate Academic Forum,the Young Researchers Forum,the Future Chemical Engineering Scholars,and the International Award for Outstanding Young Chemical Engineers. 展开更多
关键词 FOUNDING GLOBAL SCHOLARS
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Special Issue for the 14th Global Chinese Chemical Engineering Symposium
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作者 Jesse Zhu Junwu Wang 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2023年第10期1321-1322,共2页
The Global Chinese Chemical Engineering Symposium(GCCES)is a prestigious and world-wide platform for the communication and academic exchange of chemical science and engineering.This special issue is a collection of th... The Global Chinese Chemical Engineering Symposium(GCCES)is a prestigious and world-wide platform for the communication and academic exchange of chemical science and engineering.This special issue is a collection of the keynote lectures presented by the winners of Future Chemical Engineering Scholars,the Global Award for Outstanding Young Female Chemical Engineers,and the International Award for Outstanding Young Chemical Engineers,selected by the International Scientific Committee of the GCCES. 展开更多
关键词 engineering. GLOBAL Engineers
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