乱流基础工学1

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1、Areviewofparticle-turbulenceinteractionandcloudsinengineeringAbstractThisreviewsummarizesrecentprogressontheparticle-turbulenceinteractionanddiscussesthepossibleimplicationsforcloudsinengineering.Theparticle-turbulenceinteractionandcloudsinengineeringhavebeenstudied.Theresultsofthisanalysisindica

2、tethattheeffectofpreferentialconcentrationduringdiffusionalgrowthcannotexplainadequatelytheobserveddropletspectralbroadeninginadiabaticcloudcores-ThereasonisattributabletotherelativelysmallStokesnumberoftheclouddropletsunderconsiderationandtherelativelyshortdurationassociatedwithstrongvariationsi

3、ntheconcentrationofdroplets-Fluidturbulenceisubiquitousandsoisitsabilitytotransportparticulatemattersuchasdust,sootordroplets.Thedynamicsofparticlesinaturbulentflowisfundamentaltoeverydaylife・examplesofopenscientificandtechnologicalissuesincluderainformationinclouds,pollutiondispersionintheatmosp

4、here,andoptimizationandemissionreductionincombustion,planktonpopulationdynamics-andconstituteamajorscientificchallengewithimmediatepracticalimplicationsandapplications.Openscientificissuessuchasinertia,finiteparticlessizes,collisions,advectionincomplexflowgeometriesareexamplesoffundamentalkeyingr

5、edientswhichposechallengingtheoreticalproblemsandneedtobeunderstoodinordertohaveanimpactonapplications.Byjoiningforceswithintheexperimentalandnumericalcommunityofturbulencemajorbreakthroughscanbeachieved.However,whystudyClouds?Cloudsareextremelyeffectiveintheirinteractionwithvisibleandinfraredrad

6、iation.Cloudscanbecome"colloidallyunstable59andformraindrops.Cloudsplayacrucialroleintransportingwaterandenergyintheatmosphere.WhenviewedfromspaceEarthrevealsmuchmorecloudandOceanisthanland.Approximately70%oftheearthwascoveredbywater.Cloudsrepresentthehighestmassconcentrationofanyatmosphericaeros

7、ol.Cloudcharacteristicsareinherentlylinkedtotheformationandevolutionofclouddropletsizedistribution.Theparticle-turbulenceinteractionanddiscussesthepossibleimplicationsforcloudphysicshasbeenstudied.Interactionsbetweentu