资源描述：
《Experiments on the non-Boussinesq flow of非Boussinesq流动的实验研究 陡坡上的自点火悬浮流 斜坡》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、JOURNALOFGEOPHYSICALRESEARCH,VOL.113,F01003,doi:10.1029/2007JF000753,2008Experimentsonthenon-Boussinesqflowofself-ignitingsuspensioncurrentsonasteepopenslope1,2,32B.TurnbullandJ.N.McElwaineReceived12January2007;revised20August2007;accepted27September2007;published19January2008.[1]Pyrocl
2、asticflowsfromvolcanoes,duststormsinthedesert,andsubmarineturbiditycurrentsareallgravitycurrentsofparticlesinsuspensionoccurringinnature.Powdersnowavalanchesareonesuchflowwherethedensitydifferencebetweenthesuspendedparticlesandtheinterstitialairishighandtheparticlescarryasignificantprop
3、ortionoftheflow’smomentum.ThismeansthattheBoussinesqapproximation,wheredensitydifferencesareconsiderednegligibleininertiaterms,isnotvalid.Aspectsofsuchflows,suchastheirinternalstructureandthetransitionfromadenseflowtoasuspensioncurrentarenotwellunderstood.Repeatablelaboratoryexperiments
4、arenecessaryforabetterunderstandingoftheunderlyingphysics.Uptonow,anexperimenthasnotbeendesignedwiththecorrectsimilaritycriteriaformodelingpowdersnowavalanches.Wehaveaddressedthisbydesigningandanalyzingtheresultsfromanewexperimentalmodelofpowdersnowavalanchesthathadthreedistinctivefeatu
5、res.Fine,drysnowwasusedtoformsuspensioncurrentsinair.Thehighdensityratioofpowdersnowavalancheswaspreservedsothatthecurrentsarenon-Boussinesq.Ourexperimentsstartedwithadensecurrentthatthenself-ignited,undergoingthetransitiontoasuspensioncurrent.Theshapeandpositionofthecurrentwastrackedwi
6、thtwovideocameras,andtheairflowmeasuredwithahigh-frequencyresponsepressuretransducermountedinthebase.Weshowhowtheairpressuredatacloselymatchtheoryandrevealwhetheracurrentisprimarilydenseorsuspended.Citation:Turnbull,B.,andJ.N.McElwaine(2008),Experimentsonthenon-Boussinesqflowofself-igni
7、tingsuspensioncurrentsonasteepopenslope,J.Geophys.Res.,113,F01003,doi:10.1029/2007JF000753.1.Introductionlanchesthetransitionmechanismisusuallyveryrapid,becausetheflowsarestronglyacceleratingovertheperiod[2]Powdersnowavalanchesareavalancheswheresomeoftransitionsothatsuspensiono
