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| 1 | Experimental and numerical investigations of scale-up effects on the hydrodynamics of slurry bubble columns显示文摘Experiments and simulations were conducted for bubble columns with diameter of 0.2 m(180 mm i.d.), 0.5 m(476 mm i.d.) and 0.8 m(760 mm i.d.) at high superficial gas velocities(0.12–0.62 m·s-1) and high solid concentrations(0–30 vol%). Radial profiles of time-averaged gas holdup, axial liquid velocity, and turbulent kinetic energy were measured by using in-house developed conductivity probes and Pavlov tubes. Effects of column diameter, superficial gas velocity, and solid concentration were investigated in a wide range of operating conditions. Experimental results indicated that the average gas holdup remarkably increases with superficial gas velocity, and the radial profiles of investigated flow properties become steeper at high superficial gas velocities. The axial liquid velocities significantly increase with the growth of the column size, whereas the gas holdup was slightly affected. The presence of solid in bubble columns would inhibit the breakage of bubbles, which results in an increase in bubble rise velocity and a decrease in gas holdup, but time-averaged axial liquid velocities remain almost the same as that of the hollow column. Furthermore, a 2-D axisymmetric k–ε model was used to simulate heterogeneous bubbly flow using commercial code FLUENT 6.2. The lateral lift force and the turbulent diffusion force were introduced for the determination of gas holdup profiles and the effects of solid concentration were considered as the variation of average bubble diameter in the model. Results predicted by the CFD simulation showed good agreement with experimental data. | Zhaoqi Li Xiaoping Guan Lijun Wang Youwei Cheng Xi Li | 2016 | Chinese Journal of Chemical Engineering2016，24，8： | 4 |
| 2 | Inkjet printed large-area flexible circuits:a simple methodology for optimizing the printing quality显示文摘In this work, a simple methodology was developed to enhance the patterning resolution of inkjet printing, involving process optimization as well as substrate modification and treatment. The line width of the inkjetprinted silver lines was successfully reduced to 1/3 of the original value using this methodology. Large-area flexible circuits with delicate patterns and good morphology were thus fabricated. The resultant flexible circuits showed excellent electrical conductivity as low as 4.5 Ω/□ and strong tolerance to mechanical bending. The simple methodology is also applicable to substrates with various wettability, which suggests a general strategy to enhance the printing quality of inkjet printing for manufacturing high-performance large-area flexible electronics. | Tao Cheng Youwei Wu Xiaoqin Shen Wenyong Lai Wei Huang | 2018 | Journal of Semiconductors2018，39，1： | 1 |
| 3 | Benzene-1,4-dicarboxylic acid- N,N-dimethylacetamide (1/2) 显示文摘 | Guo Xia Cheng Youwei Li Xi | 2009 | Acta Crystallographica Section2009，65，01： | 1 |
| 4 | Solid–liquid equilibrium of dimethyl terephthalate(DMT), dimethyl isophthalate(DMI) and dimethyl phthalate(DMP) in melt crystallization process显示文摘The binary solid–liquid equilibrium of Dimethyl Terephthalate(DMT), Dimethyl Isophthalate(DMI) and Dimethyl Phthalate(DMP) was investigated by experiment and differential scanning calorimetry(DSC). The result demonstrated DMT/DMI and DMT/DMP systems are eutectic while DMI/DMP is a solid-solution system. The eutectic temperature of DMT/DMI system is 336.7 K and that of DMT/DMP is 271.1 K. Furthermore, a classical solid–liquid phase equilibrium model was used to fit the experimental data of the eutectic systems of DMT/DMI and DMT/DMP and the theoretical model could describe the eutectic solid–liquid phase diagrams properly. | Chunyuan Wu Youwei Cheng Lijun Wang Xi Li | 2017 | Chinese Journal of Chemical Engineering2017，25，12： | 1 |
| 5 | Progress in the research and development of p-xylene liquid phase oxidation process显示文摘The process of p-xylene liquid phase oxidation to produce purified terephthalic acid(PTA)involves a series of liquid phase radical reactions,chemical absorption,reac-tive crystallization,and evaporation.A commercial PTA production flow sheet includes a number of unit operations,which construct a complex process system.In this paper,a review of research and development(R&D)works on PTA process carried out in Zhejiang University during recent years is introduced.The works cover the oxidation and crystallization kinetics,gas-liquid mass transfer and evaporation,reactor modeling,database development,novel reactor design,process modeling,simulation,and optimi-zation.The author emphasizes the viewpoint through this case study that chemical reaction engineering should be developed to process system engineering to extend its scope,and particular attention should be paid on reactor and process modeling. | WANG Lijun CHENG Youwei WANG Qinbo LI Xi | 2007 | Frontiers of Chemical Science and Engineering2007，1，3： | 1 |
| 6 | Structural insights into ligand binding and activation of the human thyrotropin-releasing hormone receptor显示文摘Dear Editor,The thyrotropin-releasing hormone(TRH)is the initlal hormone of the hypothalamo-pituitary-thyroid axis(HPT),a signaling cascade required for metabolic homeostasis and development in vertebrates.TRH is a tripeptide hormone(pGlu-His-Pro-NH2)that is synthesized in the hypothalamus and activates thyrotropin-releasing hormone receptor(TRHR),a member of class A G protein-coupled receptor(GPCR). | Youwei Xu Hongmin Cai Chongzhao You Xinheng He Qingning Yuan Hualiang Jiang Xi Cheng Yi Jiang H.Eric Xu | 2022 | Cell Research2022，32，9： | 0 |
| 7 | Decomposition of C_(70) and C_(60) Under Laser Irradiation Monitored by Raman Spectroscopy显示文摘The degradation of C_(60) in organic solution by light has been reported by Taylor et al.[Nature,351(1991)277].The powders of the mixture of C_(60) and C_(70) prepared by arc heating ofgraphite electrodes in the environment of He gas was not to be stable with respect to intense irradiation of argon laser(488.0nm),as monitored by Raman spectrascopy,C_(70) is found to be first decomposed into fragmentary graphite,then C_(60) followed suit.It is interesting to note that besides graphite,some traces of diamond-like structure are shown confirming some speculations of Mackay[Nature,352(1991)762]. | CHENG Guangxu ZANG Wencheng YANG Ping WANG Wennai GU Gang DOU Youwei FENG Duan | 1992 | Chinese Physics Letters1992，9，11： | 0 |
| 8 | Combining magnetocaloric and elastocaloric effects in a Ni45Co5Mn37In13 alloy显示文摘1.Introduction Refrigeration plays an essential role in nowadays society.However,conventional refrigeration based on vapor compression cooling shows high energy consumption,complicated structure and even environmental pollution.Searching for an environmentalfriendly and energy-saving refrigeration technology has become a matter of concern[1,2].In the past few decades,the solid-state refrigeration technologies mainly represented by magnetocaloric effect(MCE),electrocaloric effect(ECE)and elastocaloric effect(e CE)have been regarded as promising candidate to replace traditional vapor compression refrigeration technology owing to environmental friendliness and high efficiency[1-9]. | Pengtao Cheng Zhenjia Zhou Jiaxing Chen Zongbin Li Bo Yang Kun Xu Zhe Li Jun Li Zhengming Zhang Dunhui Wang Suxin Qian Youwei Du | 2021 | Journal of Materials Science & Technology2021，，35： | 0 |
| 9 | Temperature of Transformation from Fullerite to Amorphous Carbon显示文摘Raman spectra during the transformation from fullerite to amorphous carbon are analyzed.The transformation temperature is obtained from intensity ratio of Stokes and anti-Stokes lines by using Placzek’s formula.The temperature,less than 2.0 x103K,is in consistence with previous work. | CHENG Guangxu GU Gang ZANG Wencheng DU Youwei FENG Duan | 1995 | Chinese Physics Letters1995，12，4： | 0 |
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