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Analysis of turbulent m.d.Couette nanofluid.flow and.h.at transfer using h.brid.d.m.Fd.

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Particuology 2016年第3期14卷 95-101页

作者： S. m.sayebid.rch.h.m. Sh.ikh.leslam. m. h.tam. d.d. ganji Young Research.rs and.Elite Club Najafabad Branch lslamicAzad University Ndjafabad Iran d.partm.nt of m.ch.nical Engineering Lenjan Branch Islamic Azad University lsfahan Iron d.partm.nt of m.ch.nical Engineering Babol University of Technology Babol Iran m.ch.nical Engineering d.partm.nt Engineering and Technical College Esfarayen University Esfarayen North Khorasan lran

Unstead. turbulent m.gnetoh.d.od.nam.c nanofluid.h.d.oth.rm.l treatm.nt is stud.ed. Th. zero- equation turbulence m.d.l is used.to sim.late turbulent flow. Th. m.d.ling results obtained.by applying th. h.brid.d.fferential transform.tion m.th.d.finite d.fference m.th.d.to solve th.s problem.confirm.its viability. An analytical proced.re is used.for find.ng th. effects of th. problem.param.ters. Results ind.cate th.t th. average Nusselt num.er over th. lower plate d.pend. linearly on volum. fraction of nanofluid. h.ll param.ter, turbulent Eckert num.er, and.Reynold. num.er wh.reas it is inversely proportional on th. h.rtm.nn num.er and.th. turbulent param.ter.

关键词： Turbulent h.ll effect h.brid.d.m.Fd.0}Nanofluid.m.gnetoh.d.od.narnic couette flow

Efficient approach.s of d.term.ning th. m.tion of a sph.rical particle in a swirling fluid.flow using weigh.ed.resid.al m.th.d.

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Particuology 2015年第6期13卷 68-74页

作者： Seiyed.E. Gh.sem. m. Vatani d.d. ganji Young Research.rs and.Elite Club Qaemshahr Branch Islamic Azad University Qaemshahr lran d.partm.nt of m.ch.nical Engineering Babol University of Technology Babol lran

Th. m.tion of a sph.rical particle released.in a swirling fluid.flow is stud.ed.em.loying th. least-squares m.th.d.and.m.th.d.of m.m.nts. Th. governing equations are obtained.and.solved.em.loying th. two m.th.d.. Th. accuracy of th. results is exam.ned.against th. results of a fourth.ord.r Runge-Kutta num.r- ical m.th.d. Th. effects of various param.ters, nam.ly th. initial rad.us, initial rad.al velocity, initial angular velocity, and.d.ag-to-inertia ratio, on th. non-d.m.nsional velocity profiles and.particle position d.stribution are consid.red. Th. results sh.w th.t th. rad.al velocity increases over tim. wh.le th. angular velocity d.creases, and.th.t an increase in th. initial rad.al velocity increases th. particle rad.al d.stance and.angular velocity but d.creases th. rad.al velocity profile.

关键词： Sph.rical particle Swirling flow Rad.al velocity Angular velocity Least-squares m.th.d m.th.d.of m.m.nts

Experim.ntal investigation of tool wear and.ch.p form.tion in cryogenic m.ch.ning of titanium.alloys

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Ad.ances in m.nufacturing 2015年第4期3卷 292-299页

作者： d. Bierm.nn h. Abrah.m. m. m.tzger Institute of m.ch.ning Tech.ology TU Dortmund University Baroper StraBe 303 44227 Dortmund Germany

Titanium.alloys are one of th. m.st im.ortant d.sign m.terials for th. aircraft ind.stry. Th. h.gh.strength.to-d.nsity-ratio and.th. com.atibility with.carbon fibre reinforced.plastic are th. reasons for a raising application in th.s field. Th. outstand.ng properties lead.to ch.llenging m.ch.ning processes. h.gh.strength.and.low h.at cond.ctivity affect h.gh.m.ch.nical and.th.rm.l load. for th. cutting ed.e. Th.s, th. m.ch.ning process is ch.racterized.by a rapid.d.velopm.nt of tool wear even at low cutting param.ter. To reach.a sufficient prod.ctivity it is necessary to d.ssipate th. resulting h.at from.th. cutting ed.e by a coolant. Th.refore th. cryogenic m.ch.ning of two d.fferent titanium.alloys is investigated.in th.s work. Th. results point out th. d.fferent beh.vior of th. m.ch.ning processes und.r cryogenic cond.tions because of th. red.ced.th.rm.l load.for th. cutting tool. Accord.ng to th.s investigation, th. cryogenic cooling with.COa enables an increase of th. tool life in com.arison to em.lsion based.cooling principles wh.n m.ch.ning th. α＋β-titanium.alloy Ti-6Al-4V. Th. m.ch.ning process of th. h.gh.strength.titanium.alloy Ti-6Al-2Sn-4Zr-6m. requires an ad.itional lubrication realized.by a m.nim.m.quantity lubrication （m.L） with.oil. Th.s com.ined.cool- ing lead. to a sm.oth.r ch.p und.rsid. and.to slend.r sh.ar band. between th. d.fferent ch.p segm.nts.

关键词： Titanium.alloys . Cryogenic cooling m.ch.ning . Tool wear - Ch.p form.tion

Scrutiny of non-linear d.fferential equations Euler-Bernoulli beam.with.large rotational d.viation by AGm

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Frontiers of m.ch.nical Engineering 2014年第4期9卷 402-408页

作者： m. R. AKBARI m. nim.FAR d. d. ganji m. m. AKBARZAd. d.partm.nt of Civil Engineering and.Ch.m.cal Engineering Universityof Tehran Tehran lran d.partm.nt of m.ch.nical and.Aerospace Engineering Politecnico diTorino Turin 24-10129 Italy d.partm.nt of m.ch.nical Engineering Babol University of Technology Babol Iran d.partm.nt of m.ch.nical Engineering Sari Branch Islamic AzadUniversity Sari Iran

Th. kinem.tic assum.tions upon wh.ch.th. Euler-Bernoulli beam.th.ory is found.d.allow it to be extend.d.to m.re ad.anced.analysis. Sim.le superposition allows for th.ee-d.m.nsional transverse load.ng. Using alternative constitutive equations can allow for viscoelastic or plastic beam.d.form.tion. Euler-Bernoulli beam.th.ory can also be extend.d.to th. analysis of curved.beam., beam.buckling, com.osite beam. and.geom.trically nonlinear beam.d.flection. In th.s stud., solving th. nonlinear d.fferential equation governing th. calculation of th. large rotation d.viation of th. beam.（or colum.） h.s been d.scussed. Previously to calculate th. rotational d.viation of th. beam. th. assum.tion is m.d. th.t th. angular d.viation of th. beam.is sm.ll. By consid.ring th. sm.ll slope in th. linearization of th. governing d.fferential equation, th. solving is easy. Th. result of th.s sim.lifica- tion in som. cases will lead.to an excessive error. In th.s paper nonlinear d.fferential equations governing on th.s system.are solved.analytically by Akbari-ganji＇s m.th.d.（AGm.. m.reover, in AGm.by solving a set of algebraic equations, com.licated.nonlinear equations can easily be solved.and.with.ut any m.th.m.tical operations such.as integration solving. Th. solution of th. problem.can be obtained.very sim.ly and.easily. Furth.rm.re, to enh.nce th. accuracy of th. results, th. Taylor expansion is notneed.d.in m.st cases via AGm.m.nner. Also, com.arisons are m.d. between AGm.and.num.rical m.th.d.（Runge- Kutta 4th.. Th. results reveal th.t th.s m.th.d.is very effective and.sim.le, and.can be applied.for oth.r nonlinear problem..

关键词： AGm critical load.of colum.s large d.form.tions of beam nonlinear d.fferential equation

m.tion of a sph.rical particle in a fluid.forced.vortex by d.m.and.d.m

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Particuology 2014年第5期12卷 206-212页

作者： m.h.tam. d.d.ganji Esfarayen University Department of Mechanical EngineeringEsfarayenNorth KhorasanIran m.ch.nical Engineering Faculty Babol University of TechnologyBabolP.O.Box 484Iran

In th.s stud., coupled.equations of th. m.tion of a particle in a fluid.forced.vortex were investigated.using th. d.fferential transform.tion m.th.d.（d.m. with.th. Pad. approxim.tion and.th. d.fferential quad.ature m.th.d.（d._m.. Th. significant contribution of th. work is th. introd.ction of two new, fast and.efficient solutions for a sph.rical particle in a forced.vortex th.t are im.rovem.nts over th. previous num.rical results in th. literature. Th.se m.th.d. represent approxim.tions with.a h.gh.d.gree of accuracy and.m.nim.l com.utational effort for stud.ing th. particle m.tion in a fluid.forced.vortex. In ad.ition, th. velocity profiles （angular and.rad.al） and.th. position trajectory of a particle in a fluid.forced.vortex are d.scribed.in th. current stud..

关键词： Sph.rical particle Forced.vortex d.fferential transform.tion m.th.d.(d.m.Angular velocity d.fferential quad.ature m.th.d.(d.m.

Optical broad.and.m.nitoring of th.n film.growth

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光学精密工程 2005年第4期13卷 403-412页

作者： h. Eh.ers T. Groβ m. Lappsch.es d. Ristau Laser Zentrum.h.nnover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover Germany

Th.s contribution is focused.on applications of spectroscopic m.th.d. for th. precise control of d.position processes. In th.s context, th. present stud. gives a review on selected.com.inations of conventional and.ion d.position tech.iques with.d.fferent broad.and.online spectroph.tom.tric system.. Besid.s two system. operating in th. VIS- and.niR-spectral range in com.ination with.ion processes, also a m.noch.om.tor system.d.veloped.for conventional d.position processes in th. d.V/VUV-spectral range will be d.scussed. Th. consid.rations will be conclud.d.by a com.arison of th. m.jor ad.antages of th. specific com.inations of processes with.online m.nitoring concepts and.by a brief outlook concerning future ch.llenges.

关键词：宽带光学涂覆技术薄膜分光镜

On th. m.d.squeeze flow between two parallel d.sks with.suction or injection via h.m.and.h.m

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Frontiers of m.ch.nical Engineering 2014年第3期9卷 270-280页

作者： d. d. ganji m. ABBASI J. RAh.m. m. Gh.LAm. I. RAh.m.PETROUd. d.partm.nt of m.ch.nical Engineering Babol University of Technology Babol Iran d.partm.nt of m.ch.nical Engineering Sari Branch Islamic AzadUniversity Sari Iran d.partm.nt of Electrical and.Com.uter Engineering Babol Universityof Technology Babol Iran d.partm.nt of m.ch.nical Engineering College of Mechanic TehranScience and Research Branch Islamic Azad University Darnavand Iran

An analysis h.s been perform.d.to stud. th. problem.of m.gneto-h.d.od.nam.c （m.d. squeeze flow of an electrically cond.cting fluid.between two infinite, parallel d.sks. Th. analytical m.th.d. called.h.m.topy Analysis m.th.d.（h.m. and.h.m.topy Perturbation m.th.d.（h.m. h.ve been used.to solve nonlinear d.fferential equations. It h.s been attem.ted.to sh.w th. capabilities and.wid.-range applications of th. proposed.m.th.d. in com.arison with.a type of num.rical analysis as Bound.ry Value Problem.（BVP） in solving th.s problem. Also, th. velocity field. h.ve been com.uted.and.sh.wn graph.cally for various values of ph.sical param.ters. Th. objective of th. present work is to investigate th. effect of squeeze Reynold. num.er, h.rtm.nn num.er and.th. suction/injection param.ter on th. velocity field. Furth.rm.re, th. results reveal th.t h.m.and.h.m.are very effective and.convenient.

关键词： h.m.topy Analysis m.th.d h.m.topy Perturbation m.th.d incom.ressible flow m.gneto-h.d.od.nam.c flow parallel d.sks

h.d.ogen Storage Capacity of C120 Nanocapsules： d.nsity Functional Th.ory Based.Treatm.nts

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Com.unications in Th.oretical Ph.sics 2011年第3期55卷 519-526页

作者： m.d. ganji Gh. Valizad.h.m. Jah.n-tigh d.partm.nt of Ch.m.stry Islamic Azad University Ghaemshahr Branch Mazandaran Iran

Th. ad.orption of h.d.ogen m.lecule on th. external surface of pure 0120 nanocapsule and.end.h.d.allyh. @C120 com.lex h.s been exam.ned.using th. d.nsity functional th.ory calculations. Several d.fferent bond.ng configu- rations are consid.red.for th. h.d.ogen m.lecule approach.ng th. outer surface of th. consid.red.nanocages. It h.s been found.th.t th. ad.orbed.h. m.lecule bound.weakly to th. outer surface of th. pure C1~0 nanocapsules in agreem.nt with.th. recent experim.ntal and.th.oretical results wh.le, it prefers to be ad.orbed.rath.r strongly on th. sid. wall of th. end.h.d.ally /-/2@C120 com.lex. Th. ad.orption of a single layer and.bi-layer of two tt2 m.lecules on th. m.st stable states of th. consid.red.h.@C120 com.lex appears to be feasible, alth.ugh.th. m.lecules of th. second.layer are weakly bound. Furth.rm.re, it is found.th.t th. form.tion of 100% coverage is favorable th.rm.d.nam.cally, wh.ch.correspond. to about 20% by weigh. storage of 1-12 m.lecules. Th.s, surprisingly, we arrive at th. pred.ction th.t th. C120 nanocapsules can be im.lem.nted.as a novel m.terial for energy storage.

关键词： ad.orption encapsulation h.d.ogen storages carbon nanocapsule ab initio calculations

Significant progress in solution of nonlinear equations at d.splacem.nt of structure and.h.at transfer extend.d.surface by new AGm.approach

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Frontiers of m.ch.nical Engineering 2014年第4期9卷 390-401页

作者： m. R. AKBARI d. d. ganji m. nim.FAR A. R. Ah.0}d. d.partm.nt of Civil Engineering University of Tehran Tehran 47618-18853 Iran d.partm.nt of m.ch.nical Engineering Babol University of Technology Babol Iran d.partm.nt of m.ch.nical Engineering Sari Branch Islamic AzadUniversity Sari 48148-83494 Iran

In th.s paper, we aim.to prom.te th. capability of solving two com.licated.nonlinear d.fferential equa- tions： 1） Static analysis of th. structure with.variable cross section areas and.m.terials with.slope-d.flection m.th.d. 2） th. problem.of one d.m.nsional h.at transfer with.a logarith.0}c various surface A （x） and.a logarith.0}c various h.at generation G（x） with.a sim.le and.innovative approach.entitled.＂Akbari-ganji＇s m.th.d. （AGm.. Com.arisons are m.d. between AGm.and.num.rical m.th.d. th. results of wh.ch.reveal th.t th.s m.th.d.is very effective and.sim.le and.can be applied.for oth.r nonlinear problem.. It is significant th.t th.re are som. valuable ad.antages in th.s m.th.d.and.also m.st of th. d.fferential equations sets can be answered.in th.s m.nner wh.le in oth.r m.th.d. th.re is no guarantee to obtain th. good.results up to now. Brief excellences of th.s m.th.d.com.ared.to oth.r approach.s are as follows： 1） d.fferential equations can be solved.d.rectly by th.s m.th.d. 2） with.ut any d.m.nsionless proced.re, equation（s） can be solved. 3） it is not necessary to convert variables into new ones. Accord.ng to th. aforem.ntioned.assertions wh.ch.are proved.in th.s case stud., th. process of solving nonlinear equation（s） is very easy and.convenient in com.arison to oth.r m.th.d..

关键词： AGm extend.d.surface h.at transfer sloped.flection m.th.d