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Experimental and Numerical Investigations of an Ice-slurry Generator

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过程工程学报 2004年第1期4卷 1-7页

作者：洪若瑜董梁尚德义徐建生 Kawaji M dept. chem. & chem. Eng. Soochow University Suzhou Jiangsu 215006 China dept. chem. Eng. & Appl. chem. University of Toronto Toronto ON M5S 3E5 Canada

A new test facility equipped with refrigerant and brine circulation systems, and a rotating-scraper ice-slurry generator was constructed to analyze the ice-slurry flow and heat transfer accompanied by phase change in an industrial generator. The axial and transverse brine temperature and ice fraction concentration profiles in the ice generator were measured. The heat transfer efficiency lower than the average was identified in the upper half of the ice generator and its cause was determined by conducting three-dimensional numerical simulation using a commercial CFD code, FLUENT. Approaches of improving the brine-side heat transfer rates were investigated by incorporating extra mixing blades from numerical simulation.

关键词：泥浆泵计算流体力学实验研究数值模拟

Computational Fluid Dynamic Simulation of Liquid-Liquid Mixing in a Static Double-T-shaped Micromixer

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过程工程学报 2008年第6期8卷 1080-1084页

作者： Elmabruk A. MANSUR 王运东戴猷元 The State Key Lab. chem. Eng. Dept. Chem. Eng.Tsinghua University

The laminar flow structure and mixing performance of T-shaped and double-T-shaped micromixers with rectangular cross-section have been investigated using computational fluid dynamic (CFD) simulation. FLUENT software is used to evaluate the mixing efficiency. The numerical simulation results show that the presented double-T-micromixer is highly efficient over T-shaped micromixer. The performance of double-T-micromixer with and without static mixing elements (SME) is also investigated. The enhancement in mixing performance is thought to be caused by the generation of eddies and lateral velocity component when the mixture flows through these elements. Mixing efficiency as higher as 97% is reached within a mixing length of 320 μm downstream from the first T-junction with the enhancement of three SMEs.

关键词：计算方法流体动力学模拟方法液液混合双T形微混合器物理过程

Luminescent Properties of Tetrakis (1-(2-Thenoy)-3,3,3-Trifluoracetate) Europium N-Hexadecyl Pyridinium in Modified Si-MCM-41

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Journal of Materials Science & Technology 2001年第2期17卷 290-292页

作者： Qinghong XU, Liansheng LI, Bin LI, Jihong YU and Ruren XU Key Laboratory of Inorganic Synthesis & Preparative chem.stry, Department of chem.stry, Jinn University, Changchun 130023, China dept. of chem. Jilin Univ. Changchun 130023 China

Eu(TTA)4C5H5NC16H33(TTA:1-(2-Thenoy)-3,3,3-Trifluoracetate) is encapsulated in St- MCM-41 modified with N-(3-Trimethoxysilethyl)ethylene. The emission spectrum of the assembly shows only a 5D0-7F2 transition. As compared with the rare earth complex itself, the lifetime of the assembly becomes longer and its stability under the UV radiation is much better.

关键词： MCM Europium N-Hexadecyl Pyridinium in Modified Si-MCM-41 Trifluoracetate Thenoy Si

Polymerization of N-Phenylmaleimide Catalyzed by (ArO)_2Sm(THF)_4

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Journal of Rare Earths 2001年第1期19卷 15-17页

作者：王耀荣沈琪邓明宇 dept. of chem. Suzhou Univ. Suzhou 215006 China

N phenylmaleimide was successfully polymerized by divalent samarium complex (ArO) 2Sm(THF) 4 (ArO= 2,6 ditertbutyl 4 methyl phenoxo ). The results show that the conversion of polymerization is higher in THF than in other solvents and increases with increasing the monomer concentration. The temperature has less effect on the polymerizing process.

关键词： rare earths poly(N phenylmaleimide) divalent samarium complex

Pharmacological Study on Antitumor Activity of 5-Fluorouracil-1-Acetic Acid and Its Rare Earth Complexes

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Journal of Rare Earths 2000年第2期18卷 140-143页

作者： Yang, Zheng-Yin Wang, Liu-Fang Yang, Xin-Ping Wang, Da-Wei Li, Yu-Ming dept. of chem. Lanzhou Univ. Lanzhou 730000 China

The antitumor activity of 5 fluorouracil 1 acetic acid(HFAA) and its lanthanide complexes(La(FAA) 3, Eu(FAA) 3) were studied. The results show that HFAA, La(FAA) 3 and Eu(FAA) 3 with the concentrations of 1 0×10 -5 ～1 0×10 -2 μg·ml -1 inhibit the colony formation of leukemia cells(L 1210 ) and the growth of transplanted tumor sarcoma 180(S 180 ), hepatic carcinoma(HEPA) and ehrlich ascites tumor(EC) as well. The maximum inhibitory rate of Eu(FAA) 3 for S 180 is 38 4%, that HFAA and La(FAA) 3 for EC are 22 4% and 43 4%, respectively. The life prolongation rate of Eu(FAA) 3 for HEPA bearing mice is as long as 284%.

关键词： rare earths antitumor activity 5 fluorouracil 1 acetic acid

The Simultaneous Determination of Cu Ph Cd and Sb by Derivative Adsorption Chronopotentiometry

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Chinese chem.cal Letters 2000年第9期11卷 807-808页

作者： Xiao Li ZHANG Shu Ying PAN Department of chem.stry Shandong University, Jinan 250100 dept. of chem. Shandong University Jinan 250100 China

The behaviour of the complexes of copper,lead,cadmium and antimony with salicylfluorone (SAF) adsorbed on HMDE has been investigated by derivative chronopotentiometry in NH_3/NH_4C1. The dependence of the peak height on the dt/dE vs E curve on preconcentration time, the pH of solution and the constant reducing current are discussed. This method achieved the simultaneous determination of copper, lead, cadmium and antimony in human hair.

关键词： Simultaneous determination Cu,Pb,Cd,Sb complex chronopotentiometry.

EIS STUDY ON ZINC RICH PAINTS IN 3.5% NaCl SOLUTION BY DOUBLE-CELL TEST

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Acta Metallurgica Sinica(English Letters) 2002年第3期15卷 299-306页

作者： DM. Xie, J.M. Hu, J.M. Wang and J.Q. ZhangDepartment of chem.stry, Zhejiang University, Hangzhou 310027, ChinaState Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China dept. of chem. Zhejiang Univ. Hangzhou 310027 China

This paper discussed the possibility of obtaining electrochem.cal impedance spectroscopy (EIS) responses of zinc rich paints (ZRP) using serial double-cell (SDC). The influence of counter electrode was outlined. An equivalent circuit (ES) for the double-cell was then discussed. The relationship between EC, the time constant, the parameters in EC of SDC and those of two single sells was discussed. The results gained by serial double cell test are consistent with those of single cell test. It can be concluded that double cell test method can be used to study ZRP completely.

关键词： Electrodes Equivalent circuits Sodium chloride Spectroscopy Zinc

Photophysical Property of Ternary Complex Eu(DPHA)_3·Phen·2H_2O

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Journal of Rare Earths 2001年第3期19卷 172-176页

作者：王明召王淑贤蔡冠梁 dept. of chem. Beijing Normal Univ. Beijing 100875 China

One ternary complex of europium with the plant growth regulator HDPHA (2-Hydroxydiphenyl acetic acid) and Phen (1,10-Phenanthroline), Eu(DPHA) 3·Phen·2H 2O, was synthesized and characterized by the elemental analysis and DTA-TG measurement. The photophysical property of the complex was investigated by means of IR spectra, Raman spectrum and laser-exited, high-resolved excitation and emission spectra as well as time-resolved luminescence spectra. The luminescence spectra reveal four Eu 3+ sites with energy difference within 25 cm -1 and local symmetries of C 1 or C 2 or C s in the complex. The energy transfer among the Eu 3+ sites is observed. The 7F J sublevel splitting of the Eu 3+ ion is discussed.

关键词： rare earths europium ternary complex photophysical property Eu 3+ sites

Synthesis and Structural Characterization of Adduct [La(NO_3)_3·4H_2O]·2(BQEB)

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Journal of Rare Earths 2001年第1期19卷 1-5页

作者：朱文祥苟宝迪张永安李言陈学安 dept. of chem. Beijing Normal Univ. Beijing 100875 China

New podand compound 1,2 bis (8′ quinolyloxy ethoxy) benzene (BQEB) was prepared. A lanthanum adduct with BQEB was synthesized and its structure was characterized by X ray crystal analysis using Mo Kα radiation ( λ =0 071073 nm). Crystal data: space group C2/c, Z=4, a =1 8636(3) nm, b =2 0036(3) nm, c =1 5186(3) nm, α =90 00°, β =91 452(14)°, γ =90 00°, R f=0 0373 for 6520 observed data. In the crystal structure the La 3+ is ten coordinated by three NO - 3 and four H 2O. Two podand molecules link to the coordination core via O—H…N (average O…N=0 2766(3) nm) hydrogen bonds. The adduct has a one dimensional chain sandwich structure consisting of every two podand molecules with a [La(NO 3) 3·4H 2O] as a bridge. The whole crystal is packed in a manner of…LLMLLMLL….

关键词： rare earths podand lanthanum adduct sandwich structure