钢管支架的瞬态热分析.pdf

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1、ME477TransientThermalExample1ANSYSExample:TransientThermalAnalysisofaPipeSupportBracketThesectionofpipeshownbelowisarepresentativesectionofalongerpipecarryingahotfluidunderpressure.Thepipeissupportedevery400mmbyabracketthatisweldedtothepipeandsubsequently

2、attachedtothewall.Thepipeandbracketaremadeof2024-T6aluminum.Thepipehasanouterandinnerdiameterof50mmand38mm,respectively.Thebracketisattachedtothewallwithaninsulatingpadalongthebase,sothereisnoheattransferbetweenthewallandbracket.Alldimensionsinthefigurebe

3、lowaregiveninmm.Theairtemperaturesurroundingthepipeandbracketis300K,andtheheattransfer2(film)coefficientbetweentheairandpipe/bracketish=200W/(m-K).Thepipeandbracketalsohaveauniforminitialtemperatureof300K.Fluidatatemperatureof450Kthenbeginsflowingthrought

4、hepipe,andtheheattransfer(film)coefficientbetweenthepipeandfluidis2h=1200W/(m-K).Inthisexample,ANSYSwillbeusedtoperformatransientthermalanalysisonthepipeandbracket.Thetemperatureinthepipeandbracketwillbeexaminedoveraperiodof20secondsafterthefluidbeginsflo

5、wingthroughthepipe.Acontourplotofthetemperaturedistributioncanbegeneratedatanypointintime,andtemperaturevs.timeplotscanbegeneratedforanynode.Animationcanalsobeusedtodisplaythetemperaturedistributionintheentirepartasafunctionoftime.Theanalysiswillbeperform

6、edusing10node,3Dthermalelements(SOLID87).4003850162.5162.5100157515Insulated40Thefollowingthermalpropertiesof2024-T6aluminumarerequiredfortheanalysis.Temperature(K)100200300400600ThermalConductivity,k(W/m-K)65163177186186SpecificHeat,c(J/kg-K)473787875925

7、10423Thedensityofthealuminumalloyis2770kg/m,whichisconstantwithinthetemperaturerangeconsideredhere.ME477TransientThermalExample2ANSYSAnalysis:StartANSYSProductLauncher,settheWorkingDirectorytoC:temp,defineJobNameas‘Pipe_Bracket’,andclickRun.ThendefineTit

8、leandPreferences.UtilityMenuÆFileÆChangeTitle…ÆEnter‘TransientThermalAnalysisofaPipeBracket’ÆOKANSYSMainMenuÆPreferencesÆPreferencesforGUIFilteringÆSelect‘Thermal’and‘h-method’ÆOKEnterthePreprocessortodefinethemodel