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工业浮选槽中气体分散性的测量
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作者 S.什瓦兹 汪镜亮 李长根 《国外金属矿选矿》 2006年第12期36-39,共4页
近100年来浮选厂的冶金学家一直想弄清“泡沫下面”发生了什么。为帮助探索这一秘密,作为澳大利亚矿物工业研究协会(AMIRA)P9项目的一部分,进行了新技术的开发,以便在工业浮选槽中测量气体分散特性(如矿浆含气量、气体横载面速度及气泡... 近100年来浮选厂的冶金学家一直想弄清“泡沫下面”发生了什么。为帮助探索这一秘密,作为澳大利亚矿物工业研究协会(AMIRA)P9项目的一部分,进行了新技术的开发,以便在工业浮选槽中测量气体分散特性(如矿浆含气量、气体横载面速度及气泡大小)。Julius Kruttschnitt矿物研究中心(JKMRC)和JKTech的研究人员对大量的不同类型和规格的浮选槽进行了这些测量。建立了一个大型数据库,本文叙述了该数据库的内容。典型浮选槽特性的测量结果表明,数值极为分散,即使同种类型和规格的浮选槽进行类似的作业是如此。在常规浮选槽中,矿浆含气量一般为3%~20%,气泡尺寸在1~2mm之间,气体横截面速度1~2.5cm/s。本文给出的浮选槽特性测量值的范围将能使选矿厂人员将他们的操作与澳大利亚及世界其他地方类似类型的操作进行比较,为进一步改进浮选厂的操作提供了机会。 展开更多
关键词 泡沫浮选 浮选机 浮选气泡 气体分散度
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Influence of Cell Components Structure on Heat and Mass Transfer Phenomena in Single-Cell PEFC
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作者 Akira Nishimura Atsushi Morimoto +5 位作者 Shigeki Tanaka Atsushi Oshima Masafumi Hirota Eiji Tohma Yukio Kimura Masahiko Narita 《Journal of Energy and Power Engineering》 2012年第4期504-518,共15页
The purpose of this study is to point out the dominant factor of heat and mass distribution in single-cell PEFC (polymer electrolyte fuel cell). The numerical simulation by simple 3D model to clarify the influence o... The purpose of this study is to point out the dominant factor of heat and mass distribution in single-cell PEFC (polymer electrolyte fuel cell). The numerical simulation by simple 3D model to clarify the influence of cell components structure on heat and mass transfer phenomena as well as power generation experiment and measurement of in-plane temperature distribution by thermograph was carried out. From the simulation, the gas channel pitch of separator was the key factor to unify in-plane distribution of temperature and gas concentration on reaction surface in cell. The compression of GDL (gas diffusion layer) by cell binding caused wider distribution of mass concentration in GDL. From the experiment, the power generation performance was promoted with decreasing gas channel pitch. The temperature range in observation area was reduced with decreasing gas channel pitch. It can be concluded that the power generation performance is promoted by decreasing gas channel pitch. 展开更多
关键词 PEFC gas channel pitch effect of compression of GDL heat and mass transfer.
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Non-Gaussian and Clustering Behavior in One-Dimensional Polydisperse Granular Gas System
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作者 CHEN Zhi-Yuan ZHANG Duan-Ming +1 位作者 ZHONG Zhi-Cheng LI Rui 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第6期1135-1142,共8页
We present a one-dimensional dynamic model of polydisperse granular mixture with the fractal characteristic of the particle size distribution, in which the particles are subject to inelastic mutual collisions and are ... We present a one-dimensional dynamic model of polydisperse granular mixture with the fractal characteristic of the particle size distribution, in which the particles are subject to inelastic mutual collisions and are driven by Gaussian white noise. The inhomogeneity of the particle size distribution is described by a fractal dimension D. The stationary state that the mixture reaches is the result of the balance between energy dissipation and energy injection. By molecular dynamics simulations, we have mainly studied how the inhomogeneity of the particle size distribution and the inelasticity of collisions influence the velocity distribution and distribution of interparticle spacing in the steady-state. The simulation results indicate that, in the inelasticity case, the velocity distribution strongly deviates from the Gaussian one and the system has a strong spatial clustering. Thus the inhomogeneity and the inelasticity have great effacts on the velocity distribution and distribution of interparticle spacing. The quantitative information of the non-Gaussian velocity distribution and that of clustering are respectively represented. 展开更多
关键词 INELASTICITY restitution coefficient e INHOMOGENEITY fractal dimension D polydisperse granulax gases
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