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化工冶金 1991年第4期12卷 332-337页

作者：赵宝元北京化工学院应用数理系北京100029

自89年11月高维岳关于轴向扩散模型一文发表后,《化工冶金》就这一问题展开了讨论,肖文德,毛在砂等均发表过意见.本文试图说明文[1]的结论及理论意义,并探讨扩散模型的适用范围,边界条件的提法及理论解的解释.此外,还就文[2][3]作了一... 详细信息

自89年11月高维岳关于轴向扩散模型一文发表后,《化工冶金》就这一问题展开了讨论,肖文德,毛在砂等均发表过意见.本文试图说明文[1]的结论及理论意义,并探讨扩散模型的适用范围,边界条件的提法及理论解的解释.此外,还就文[2][3]作了一些评论.

关键词：扩散模型边界条件停留时间分布

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Evaluation of Mixing Efficiency in Coagulation-Flocculation Process in Wastewater Treatment

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Journal of Environmental Science and Engineering(A) 2012年第7期1卷 898-903页

作者： Tamas Karches Department of Sanitary and Environmental Engineering Budapest University of Technology and Economics (BME) BudapestH-1111 Hungary

Fluid flow and mixing phenomenon have a significant impact on coagulation and flocculation processes. Particles dissipating the turbulent kinetic energy increase the efficiency of collision, grow in size and incorporate phosphate from the wastewater. Only certain flocks can be separated depending on their stability, size, density, etc.. According to the literature the velocity gradient of the flow (G-value) is the main design parameter of the flocculators, but there is a need to take into account at least the flocks age, too. In this paper, it presents a novel approach to determine the efficiency of flocculators using local mean age theory, residence time distribution and dimensional analysis. Calculations were performed for two constructions of cascade reactors-one with small baffles and one without these; hydraulical performance and the achievable conversion were compared. As a result, the flocculator with small baffles proved to be more efficient than the traditional construction.

关键词：混合效率废水处理混凝过程评价停留时间分布平均年龄流体流动絮凝过程

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Residence Time Distribution at Laminar Pulsatile Flow in a Straight Pipe

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Journal of Chemistry and Chemical Engineering 2011年第4期5卷 358-368页

作者： Pavel Novotny Rudolf Zitny Hynek Chlup Jakub Kronek David Hromadka Faculty of Mechanical Engineering Czech Technical University in Prague Prague 4 166 07 Czech Republic

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Improving Residence Time Distribution in Glass Melting Tanks Using Additionally Generated Lorentz Forces

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Journal of Chemistry and Chemical Engineering 2015年第3期9卷 203-210页

作者： Senan Soubeih Ulrich Luedtke Bemd Halbedel Department of Electrical Engineering and Information Technology Electrothermal Energy Conversion Group Technische University llmenau llmenau 98684 Germany Department of Mechanical Engineering Group of Inorganic-Nonmetallic Materials Technische University llmenau llmenau 98684 Germany

Continuous glass melting tanks represent thermo-chemical reactors with very complex flow patterns. Controlling the flow patterns within the glass melting tanks with the aim of improving their performance is one of the glass industry primary challenges. The tank performance is basically determined by the RTD (residence time distribution) of the glass melt, which directly impacts the glass quality and energy distribution. In the present work, numerical simulations are carried out on the electromagnetic flow control to investigate how well the flow can be controlled by externally generated electromagnetic (Lorenz) forces that are added to the glass melt. Furthermore, the melting tanks are equipped with supplementary electric heating systems called "electric boosters". The desired result would be an improved RTD. The electromagnetic flow control is called "electromagnetic boosting" and can be realized by exposing the glass bath to an external magnetic field generating Lorentz forces on the glass melt as an additional flow component. The numerical simulations of the present study require coupled calculations of electromagnetic field, flow field, and temperature field, because the material properties of glass melt are strongly temperature-dependent. The computational results show that electromagnetic boosting is an excellent way of improving the RTD in glass melting tanks, ultimately resulting in better glass quality and increased productivity. Of course, the glass industry is highly interested in achieving exactly this result.

关键词：停留时间分布玻璃行业电磁力熔池流量控制流动模式玻璃熔体数值模拟

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