简介:Inthispaperalumpedparametermodelofatwo-passgas-to-gascrossflowheatexchangerwithhighspeedairflowhasbeenpresentedfortheinvestigationofitstransientbehaviours.Theeffectsofboththechangesofinlettemperatureandflowrateonoutlettemperaturecanbepredictedwiththismodel.Thecalcuationresultsundertypicalconditionsarecomparedwithexperimentalresultsandgoodagreementsareobtained.
简介:Amajorenergyconservationandretrofittingproject—ap-plicationofnaturalgasassupplementaryfuelforsteamcrackershasbeensuccessfullyputintooperationstartingApril30,2008attheSINOPECYangziPetrochemicalCompany.Foralongtimethesteamcrackersintheoldandnewplant-sitesattheYangziPetrochemicalCo.usedtoconsumemeth-
简介:Thebasinsbcaring0ilandgasinChinab1ongt0mu1titudinousmassifbasinswliichevo1vcdandformcdduringdiwaperiodf0llowingtheplatf0rmdisintegration.Nomatterint0whatstageintect0nicev0lutiondidabasindeve10p,thccrust0bodycharactcr0fthcbasinbasementhastliesamesignaturc.IntheBohaigulfbasinctc’whichhasc0met0diwasta8
简介:SystemofProvidingTEGas¥LiXuekuan;HeYusheng;ZhuLianfang;ChenXuebing;SuYouwuandJiaoDunpangThesystemofprovidingTEgasforcylinderf...
简介:Stronghydrodynamicinteractionsduringtheside-by-sideoffloadingoperationbetweenfloatingliquefiednaturalgas(FLNG)andliquefiednaturalgascarrier(LNGC)caninducehighrisksofcollision.Theweathervaneeffectofasingle-pointmooringsystemnormallyresultsinthesatisfactoryhydrodynamicperformanceoftheside-by-sideconfigurationinheadseas.Nevertheless,thechangesinwavedirectionsinrealseaconditionscansignificantlyinfluencetherelativemotions.Thisarticlestudiestherelativemotionsoftheside-by-sidesystembyusingthetheoreticalanalysismethodandthenumericalcalculationmethod.Basedonthethree-dimensionalpotentialtheorymodifiedbyartificialdamping-lidmethod,thefrequency-domainhydrodynamiccoefficientscanbeimprovedtocalculatetheretardationfunctionsforthemulti-bodyproblem.Anin-housecodeisthendevelopedtoperformthetime-domainsimulationoftwovessels,throughwhichtherelativemotionsaresubsequentlyobtained.Arangeofobliquewavesarechosenfortheextensivecalculationofrelativemotionsbetweenthetwovessels,whicharefurtheranalyzedintermsofthephaseshiftofmotionresponsesinducedbyspecificresonantwavepatterns.Investigationresultsshowthatwavedirectionshaveasignificantinfluenceontherelativesway,roll,andyawmotions.Underthecircumstancethattheabsolutephaseshiftbetweentherollmotionsoftwovesselsapproaches180°,strongerrelativemotionsareinducedwhenLNGCisontheweatherside.Moreover,thegapwaterresonancesathighfrequenciestendtocausethedangerousopposedoscillationoftwovesselsintheswayandyawmodes,whereasFLNGreducesthegapwaterresonancesandrelativemotionswhenlocatedontheweatherside.
简介:Theplasma-neutralgasstructuregeneratedinamagnesiumcathodicarcoperatedwithoxygengasataconstantcurrentof50Ahasbeeninvestigatedbyemployingasimplifiedone-dimensionalfluidmodel.Themodelincludeselasticcollisionsandcharge-exchangereactionsbetweenmetallicparticlesandgasmolecules,andalsogenerationandrecombinationofgaseousionsbyelectronimpact.Thedistributionprofilesofdensityandvelocityofspeciesalongtheaxialdirectionwereobtainedatdiferentbackgroundgaspressures(intherangeof0.7~3.0Pa)bythismodel.Acomparisonwiththeexperimentswasmade.Atlowergaspressures,thedepositingparticlesweremainlythemetallicionswithalargerkineticenergy.Asthegaspressureincreased,themagnesiumatomswithsmallerkineticenergyactedasthedominantdepositingspecies.Determinedbytheminimizationofthesystem’stotalenergy,MgO(100)or/andMgO(110)orientationappearedeasilyintheMgOfilmsatlowergaspressures,andathighergaspressures,thefilmpreferredorientationwasMgO(111).
简介:Inthisarticletheemphasiswasgiventothediscussionoftheeffectsofdiameterratioandswirlingoninstabilitycharacterforthegas/liquidcoaxialjetusedbyLiao,etal.[1].Theresultsindicatethatthefinitediameterratiomarkedlyincreasesthemaximumgrowthrate,themostunstablewavenumber,aswellasthecutoffwavenumber.Itimpliesthatthefinitediameterratiowillleadtotheliquidjetbreakuplengthshorterandtheliquiddropsizesmaller.Theeffectoftheswirlingjetsismuchmorecomplex:fortheaxisymmetricperturbationmode,theswirlingenhancestheflowstability,forhelicalperturbation,thedominantinstabilitymodeoccursatn<0.Anditisfoundthatinlongwaveregionthereexistsanewkindofinstabilitymodesatn=1thatwasnotmentionedinLiaoetal.'sarticle.Forthisnewmode,thereappearsadominatedswirlingratioatwhichtheflowhasthemaximumgrowthrate.
简介:数据熔化,新研究域,是现代信息技术和许多另外的题目的集成和扩展。数据熔化概念被介绍,Dempster-Shafer证据推理被描述并且适用于油和煤气的察觉。方法的一个例子用数字模拟数据被显示出。处理结果显示数据熔化方法能广泛地在烃察觉被使用。
简介:Inordertoidentifyheavierelements,wehavedevelopedanewlongitudinalfieldgasionizationchamber(IC)withanangleof30°ofplate(asshowninFig.1).TheICisoperatedinflowingiso-butanegasatapressureof10kPa.Aftertestingbyusinga3-componentαparticlesourceandcomparingwiththeoldlongitudinalfield