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Hydrogen desorption kinetics mechanism of Mg-Ni hydride under isothermal and non-isothermal conditions

Transactions of nonferrous Metals Society of China 2016年第1期26卷 160-166页

作者：陈朝轶陈辉林马亚芹刘静贵州大学材料与冶金学院贵阳550003 贵州师范大学材料与建筑工程学院贵阳550001

The Mg-Ni hydride was prepared by hydriding combustion synthesis under a high magnetic field. The dehydriding kinetics of the hydrides was measured under the isothermal and non-isothermal conditions. A model was applied to analyzing the kinetics behavior of Mg-Ni hydride. The calculation results show that the theoretical value and the experimental data can reach a good agreement, especially in the case of non-isothermal dehydriding. The rate-controlling step is the diffusion of hydrogen atoms in the solid solution. The sample prepared under magnetic field of 6 T under the isothermal condition can reach the best performance. The similar tendency was observed under the non-isothermal condition and the reason was discussed.

关键词： Mg-Ni hydride hydrogen desorption kinetics model isothermal condition non-isothermal condition

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Fluid Flow and Mixing in non-isothermal Water Model of Continuous Casting Tundish

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Journal of Iron and Steel Research International 2008年第2期15卷 7-13,22页

作者： Mehdi ALIZADEH Hossein EDRIS Ali SHAFYEI Department of Materials Engineering Isfahan University of Technology

Fluid flow and mixing of molten steel in a twin-slab-strand continuous casting tundish were investigated using a mixing model under non-isothermal *** model led to a set of ordinary differential equations that were solved with a Runge-Kutta *** state water modeling was carried out under non-isothermal *** data obtained from the water model were used to calibrate the mixing *** to the presence of a mixed convection in the non-isothermal conditions,a channelizing flow would be created in the fluid inside the tundish.A mixing model was designed that was capable of predicting RTD（residence time distribution）curves for different cases in non-isothermal *** relationship between RTD parameters and the Tu（tundish Richardson number）was obtained for various cases under non-isothermal *** results show that the RTD parameters were completely different under isothermal and non-isothermal *** comparison of the RTD curves between the isothermal and non-isothermal conditions presents that the extent of mixing in the tundish in non-isothermal conditions is lower than the mixing extent in isothermal conditions.

关键词： tundish non-isothermal condition mixing model water modeling

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