稳态热分析报告案例ANSYS150版.docx
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稳态热分析报告案例ANSYS150版.docx
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稳态热分析报告案例ANSYS150版
(Alltimenstanjin:
nchesi
Culoulportionw卅bemodeled
本例题的主要部分为一个圆筒形罐,其上沿径向有一材料一样的接管(如图?
?
?
?
所所示),罐内流动着450°F(232°C)的高温流体,接管内流动着100°F(38°C)的低温流体,两个流体区域由薄壁管隔离。
罐的对流换热系数为250Btu/hr-ft2-oF(1420watts/m2-°K),接管的对流换热系数随管壁温度而变,它的热物理性能如表?
?
?
所示。
要求计算罐与接管的温度分布。
表?
?
?
?
温度
70
200
300
400
500
oF
密度
0.285
0.285
0.285
0.285
0.285
lb/in3
导热系数
8.35
8.90
9.35
9.8
10.23
o
Btu/hr-ft-F
比热
0.113
0.117
0.119
0.122
0.125
Btu/lb-oF
对流换热系数
426
405
352
275
221
Btu/hr-ft2-oF
6.5.1预处理
Step1:
确定分析标题
起动ANSYS后,开始一个分析,需要输入一个标题,按下面方法进行操作:
1.选择UtilityMenu>File>ChangeTitle,弹出相应对话框
2.输入Steady-statethermalanalysisofpipejunction。
3.点击OK
Step2:
设置分析单位系统
Youneedtospecifyunitsofmeasurementfortheanalysis.Forthispipe
junctionexample,measurementsusetheU.S.Customarysystemofunits
(basedoninches).Tospecifythis,typethecommand/UNITS,BINinthe
ANSYSInputwindowandpressENTER.在分析之前,需要为分析系统设定单位系统,
Step3:
DefinetheElementType
Theexampleanalysisusesathermalsolidelement.Todefineit,dothefollowing:
1.
2.
3.
4.
5.
ChooseMainMenu'Preprocessor〉ElementType>Add/Edit/Delete.TheElementTypesdialogboxappears.
ClickonAdd.TheLibraryofElementTypesdialogboxappears.
Inthelistontheleft,scrolldownandpick(highlight)"Thermal
Solid."Inthelistontheright,pick"Brick20node90."ClickonOK.
ClickonClosetoclosetheElementTypesdialogbox.
Step4:
DefineMaterialProperties
Todefinematerialpropertiesfortheanalysis,performthesesteps:
1.ChooseMainMenu'Preprocessor〉MaterialProps〉MaterialModels.TheDefineMaterialModelBehaviordialogboxappears.
2.IntheMaterialModelsAvailablewindow,double-clickonthefollowingoptions:
Thermal,Density.Adialogboxappears.
3.Enter.285forDENS(Density),andclickonOK.MaterialModel
NumberlappearsintheMaterialModelsDefinedwindowontheleft.
4.IntheMaterialModelsAvailablewindow,double-clickonthe
followingoptions:
Conductivity,Isotropic.Adialogboxappears.
5.ClickontheAddTemperaturebuttonfourtimes.Fourcolumnsareadded.
6.IntheT1throughT5fields,enterthefollowingtemperaturevalues:
70,200,300,400,and500.Selecttherowoftemperaturesby
draggingthecursoracrossthetextfields.ThencopythetemperaturesbypressingCtrl-c.
7.IntheKXX(ThermalConductivity)fields,enterthefollowingvalues,inorder,foreachofthetemperatures,thenclickonOK.Notethattokeeptheunitsconsistent,eachofthegivenvalues
ofKXXmustbedividedby12.YoucanjustinputthefractionsandhaveANSYSperformthecalculations.
8.35/12
8.90/12
9.35/12
9.80/12
10.23/12
8.IntheMaterialModelsAvailablewindow,double-clickonSpecificHeat.Adialogboxappears.
9.ClickontheAddTemperaturebuttonfourtimes.Fourcolumnsareadded.
10.WiththecursorpositionedintheT1field,pastethefivetemperaturesbypressingCtrl-v.
11.IntheC(SpecificHeat)fields,enterthefollowingvalues,inorder,foreachofthetemperatures,thenclickonOK.
.113
.117
.119
.122
.125
12.ChoosemenupathMaterial>NewModel,thenenter2forthenewMaterialID.ClickonOK.MaterialModelNumber2appearsintheMaterialModelsDefinedwindowontheleft.
13.lntheMaterialModelsAvailablewindow,double-clickonConvectionorFilmCoef.Adialogboxappears.
14.ClickontheAddTemperaturebuttonfourtimes.Fourcolumnsareadded.
15.WiththecursorpositionedintheT1field,pastethefivetemperaturesbypressingCtrl-v.
16.IntheHF(FilmCoefficient)fields,enterthefollowingvalues,
inorder,foreachofthetemperatures.Tokeeptheunitsconsistent,eachvalueofHFmustbedividedby144.Asinstep7,youcaninputthedataasfractionsandletANSYSperformthecalculations.
426/144
405/144
352/144
275/144
221/144
17.ClickontheGraphbuttontoviewagraphofFilmCoefficientsvs.temperature,thenclickonOK.
18.ChoosemenupathMaterial>ExittoremovetheDefineMaterialModelBehaviordialogbox.
19.ClickonSAVE_DBontheANSYSToolbar.
Step5:
DefineParametersforModeling
1.ChooseUtilityMenu>Parameters〉ScalarParameters.TheScalarParameterswindowappears.
2.Inthewindow'sSelectionfield,enterthevaluesshownbelow.(Do
notenterthetextinparentheses.)PressENTEFaftertypingineachvalue.Ifyoumakeamistake,simplyretypethelinecontainingtheerror.
RI1=1.3(Insideradiusofthecylindricaltank)
RO1=1.5(Outsideradiusofthetank)
Z1=2(Lengthofthetank)
RI2=.4(Insideradiusofthepipe)
RO2=.5(Outsideradiusofthepipe)
Z2=2(Lengthofthepipe)
3.ClickonClosetoclosethewindow.
Step6:
CreatetheTankandPipeGeometry
1.ChooseMainMenu>Preprocessor>Modeling>Create>Volumes>Cylinder>ByDimensions.TheCreateCylinderb
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