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Evaporation of a Thin Binary Liquid Film by Forced Convection into Air and Superheated Steam

Journal of Thermal Science 2010年第4期19卷 346-356页

作者： abdelaziz nasr Chokri Debbissi Sassi Ben nasrallah LESTE cole Nationale d'Ingenieurs de MonastirUniversite de MonastirTunisie

This paper deals with a numerical analysis of the evaporation of a thin binary liquid film by forced convection inside a channel constituted by two *** first plate is externally insulated and wetted by a thin water ethylene glycol film while the second is dry and *** first part is concerned with the effects of inlet ambiance conditions and the liquid concentration of ethylene glycol on the distribution of the velocity,temperature,concentrations profiles and the axial variation of the evaporation *** second part is focused on the inversion temperature point of the evaporation of binary liquid *** show that the inversion temperature phenomenon for the evaporation of binary liquid mixture is observed for high liquid concentration of ethylene *** present results show that in the inlet temperature range considered here,the inversion temperature does not exit for the evaporation of pure ethylene glycol.

关键词： Binary liquid film evaporation inversion temperature forced convection combined heat and mass transfer

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Synthesis of Ti3SiC2-Bicarbide Based Ceramic by Electro-Thermal Explosion

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Advances in Chemical Engineering and Science 2014年第2期4卷 242-249页

作者： nasr-Eddine Chakri Zoubida Habes abdelaziz Toubal Badis Bendjemil 1Physic Department Badji-Mokhtar University Annaba Algeria 2Laboratory Environmentally Security and Alimentary (LASEA) Badji-Mokhtar University Annaba Algeria Laboratory Environmentally Security and Alimentary (LASEA) Badji-Mokhtar University Annaba Algeria Physic Department Badji-Mokhtar University Annaba Algeria

A polycrystalline dense Ti3SiC2 based ceramic material has been produced by several techniques. The effect of addition of TiC and SiC is also studied. The Ti3SiC2 material shows extraordinary electrical, thermal and mechanical properties. Furthermore, it shows a damage tolerance capability and oxidation resistance. In this work, we have synthesized Ti3SiC2 by electro-thermal explosion chemical reaction (ETE) with high current density (900 Amperes/a.u) followed by uniaxial pressure. The structural properties of the as-prepared materials are studied by x-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDX) techniques. The chemical cartography, imaging and electronic properties are investigated using Ultra-STEM and electron high energy loss resolution spectroscopy (EELS) techniques, respectively. The surface of Ti3SiC2 is characterized by means of X-ray photoelectron spectroscopy (XPS). High resolution C 1s, Si 2p, Ti 2p, Ti 3s core level spectra are explained in terms of crystallographic and electronic structure. Valence band spectrum is performed to confirm the validity of the theoretical calculations.

关键词： Ti3SiC2 Based Ceramic Intermetallic Bicarbide Electro-Thermal Explosion Reaction (ETE) Valence Band Spectra Core Level Excitation

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An Efficient and Convenient Synthesis of Certain 2-Thioxothiazole,2-oxo-1,2-dihydropridine, 2-Oxo-2H-pyran,2,4-diaminothiophene and Pyrazolo[5,1-c][1,2,4]triazine Derivatives Containing Antipyrine Moiety

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International Journal of Organic Chemistry 2012年第2期2卷 135-142页

作者： Seif-Eldin nasr Ayyad Fathy Muhammad abdelaziz El-Taweel Abdel-Ghani Ali Elagamey Tahani Mahmoud El-Mashad Department of Chemistry Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Chemistry Faculty of Science New Damietta Branch Mansoura University New Damietta Egypt

2-Thioxothiazole derivatives 5a-c were prepared by reacting a mixture of 1a-c, CS2/KOH and 4-(2-chloroacetyl)-1, 5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one(3). Reacting 2-cyano-N-(4-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-2H- pyrazol-4-yl)-2-thioxothiazol-3(2H)-yl)acetamide (5c) with mercaptoacetic acid, arylidenemalononitriles 8 and (E)- 3-(dimethylamino)-1-(furan-2-yl)prop-2-en-1-one (12) give 4-oxo-4,5-dihydrothiazole 6, 2-oxo-1,2-dihydropyridine 10 and 2-oxo-2H-pyran 15 respectively. Heating a mixture of 5c, malononitrile and elemental sulfur yield 2,4-diaminothio- phene 19. Coupling of 5c with the diazotized aminopyrazole 20 and aryldiazonium salts 23 give pyrazolo[5,1-c][1,2,4] triazines 22 and arylhydrazones 25 respectively.

关键词： Thioxothiazoles Pyridine Thiophene Pyrazolotriazines

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