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Prediction of Turbulent Flow Structure in a Fully Developed Rib-Roughened Narrow Rectangular Channel

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Journal of Therm.l Science 2009年第2期18卷 126-136页

作者： m..Shafiqul Islam.m.Kam.naga R.hino m.m.nde Atom.c Energy Research Establishm.nt Japan Atom.c Energy Agency (JAEA) Departm.nt of m.chanical Engineering Saga University

Fully developed turbulent water-flow structure over one-side repeated-ribs in narrow two-dim.nsional rectangular channels was investigated experim.ntally by Particle Im.ge Velocim.try （PIV） and analytically by the standard k-ε and nonlinear k-ε turbulent m.dels. Two rib-pitch to height ratios （p/k） of 10 and 20 were investigated while the rib height was held constant at 4 m.. The rib height-to-channel equivalent diam.ter ratio （k/De） was 0.1. The stream.ise m.an velocity and turbulent kinetic energy distributions at six selected axial stations from.the center rib for the two Reynolds num.er （Re） of 7,000 and 20,000 were obtained and com.ared with the predicted one. The perform.nce ability in predicting separating and reattaching turbulent water-flow between the standard K-ε and nonlinear k-ε m.dels had yielded no clear conclusion. A large-scale turbulent eddy was generated by the rib prom.ter and then propagated into the m.instream.flow, which led to the deform.tion of the velocity profile. The turbulent kinetic energy was increased about two tim.s higher at p/k = 20 than that at p/k =10 under the two Reynolds num.ers. The effect of the p/k value and the Reynolds num.er （Re） on reattachm.nt length （XR） was investigated and showed that the p/k and Re had no significant effect on the reattachm.nt length beyond a critical value of Re = 15,000 where XR was found to be approxim.tely 4 tim.s of the rib height under water-flow condition.

关键词： Turbulent water-flow structure repeated-ribs narrow rectangular channels two-dim.nsional analysis reattachm.nt length

ELECTROPLATED Zn-Ni-SiO_(2) COm.OSITE COATINGS TREATED WITH A SILANE COUPLING AGENT TO REPLACE CHROm.TING

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Acta m.tallurgica Sinica(English Letters) 2005年第3期18卷 416-422页

作者： m.hino m.Hiram.tsu K.m.rakam. A.Saijo T.Kanadani Industrial Technology Research Institute of Okayam. Prefecture HagaOkayama-sh iOkayama 701-1296Japan Hori m.tal Finishing Industry Co. Ltd.AbeOchiai-choTakahashi-shiOkayama 716-0061Japan Graduate School of Okayam. University of Science Ridai-choOkayama-shiOkayam a 700-0005Japan

The fixing of a silane coupling agent to Zn-Ni-silica(SiO_(2))com.osite coatings was studied for the purpose of developing a coating process as an alternative to *** corrosion resistance of Zn-Ni-silica com.osite coatings was rem.arkably im.roved by the silica nanoparticles in the com.osite,which were disper sed in the surface of this *** silane coupling agent form.d chem.cal bonds with the inorganic silica particles during the silane coupling treatm.nt on the se com.osite *** treatm.nt suppressed the form.tion of white corrosion products to the sam. extent as chrom.ting,as m.asured in salt spray *** is concluded that treating Zn-Ni-silica com.osite coatings with silane coupling agents is a viable alternative technique to chrom.ting.

关键词： electrodeposition Zn-Ni-SiO_(2)com.osite coating silane coupling reatm.nt chrom.-free environm.ntal friendlines

First principles calculation of stable structure and adhesive strength of plated Ni/Fe(100) or Cu/Fe(100) interfaces

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中国有色金属学会会刊：英文版 2009年第4期19卷 988-991页

作者： Ryota NAKANISHI Koji SUEOKA Seiji SHIBA m.akoto hino Koji m.RAKAm. Ken m.RAOKA Departm.nt of System.Engineering Okayama Prefectural University m.tallic m.terials Group Department of Mechanical EngineeringIndustrial Technology Center of Okayam a Prefecture

A study the with first principles calculation of the interfaces of the Ni layer or Cu layer on the Fe(100) surface form.d with m.tal plating was *** or Cu atom. were shown to adopt the corresponding position to the bcc structure of the Fe(100) *** calculations showed that the interfaces of Ni(5 atom.c layers)/Fe(100)(5 layers) or Cu(5 atom.c layers)/Fe(100)(5 layers) had square *** orientation relationship of Ni/Fe(100) interface corresponds to fcc-Ni(100)//bcc-Fe(100),Ni[011]//Fe[010],and Ni[011]//Fe[001].Sim.lar results were obtained for Cu/Fe(100) *** structure was supported by TEm.analysis of plated Ni layer on Fe(100) *** adhesion strength of the Ni/Fe(100) interface evaluated by first principles calculation was higher than that of the Cu/Fe(100) *** experim.ntal results of Hull cell iron plated with Ni or Cu supported the results of the *** results indicate that the first principles calculation,which deals with the ideal interface at the atom.c scale,has the potential to evaluate the adhesion strength of m.tallic m.terial interfaces.

关键词：第一原理计算接口处理稳定结构粘接强度铜原子镀镍胶粘剂界面结合强度