求解圆管中流体以及管壁的温度分布

求解圆管中流体以及管壁的温度分布

1、设置参数

pi=acos(-l)

ri=(⑸16)-0.083)*0.0254!管内半径

0=(916)*0.0254!管外半径

1=12*0.0254!管长度

nthick=l!径向单元个数

size=(rO-ri)/nthick!径向单元长度

nlength=nint(l/size)!长度方向单元个数

ktube=100!管导热系数

kwater=0.6!流体导热系数

denswatr=1000!流体密度

cwater=4183!流体比热

vinput=3!入口流速

carea=pi*(ri**2)!流通面积

massflow=vinput*carea*denswatr!质量流率

tinlet=20!流体入口温度

tbulk=100!管外环境温度

hi=15000!管内壁与流体的对流系数

h0=10000!管外壁对流系数

2、定义三类单元

FLUID116,kl=l,k2=l

SURF151,k3=l,k4=l,k5=l,k8=2

Plane55,k3=l

(1)FLUID116,kl=l,k2=l

AElementTypes

DefinedElementTypes：__________

Type1FLUID116

Type2SURF151

Add.,・|iptions.・]Delete

CloseIHelp

(2)SURF151,k3=l,k4=l,k5=l,k8=2

AElementTypes司

DefinedElementTypes:

Type1FLUID116

ype2SURF151

Add...•ptions..

CloseHelp

ASURF151elementtypeoptions

OptionsfovSURF151,ElementTypeRef.No.2

Adiabaticwalltemp,optionKI1Rotat-absolute二j

RecoveryfactoroptionK2|Fr=NRF

ElementbehaviorK31Axisymmetric二|

MidsidenodesK41Exclude

Extranodeforradiation-K5|Include1nodeJ

-and/orconvectioncalculations

UseofbulktemperatureK61Fluidnodetemp二j

hfempiricalterm|TS-TB|**nK7|Exclude

HeatfluxandconvertloadsK8

HfataverageT▼

RadiationformfactcalcasK91Excluderadiatn勺

OK!CancelHelp

(3)Plane55,k3=l

AElementTypes

DefinedElementTypes：

Type1FLUID116

Type2SURF151

ype3PLANE55

Add...iptions...Delete

CloseHelp

3、定义实常数

(1)r,l,2*ri,carea,l

ARealConstants

DefinedRealConstantSets

Set1

Add,・・|Edit...|Delete|

CloseHelp

4、定义材料

mp,kxx,l,kwater

mp,c,l,cwater

mp,dens,Ldenswatr

mp,kxx,3,ktube

(1)mp,kxx,l,kwater

(2)mp,c,l,cwater

(3)mp,dens,Ldenswatr

(4)mp,kxx3ktube

5、建模

(1)关键点k,1,0,0,0k,2,0,-1,0k,3,0,-l-size,0

POINTSANSYS

HOV142015

TYPENUM

21:10:46

(2)建直线1,1,2\,2,3

1

FOIMTSANSYS

RV14201S

TYWSUK

21：10：U

LINESANSYS

NOV142015

LINENUM

21:17:31

(3)创建组元waterlin

UtilityMenu>Select>Comp/Assembly>CreateComponent

(4)生成管壁

AREASANSYS

NOV212015

TYPENUM

14:05:27

6、划分网格

(1)Lmesh,l,lmesh,2

MainMenu>Preprocessor>l\/leshing>SizeCntrls>ManualSize>Global>Size

1

1

ELEMENTSL_xANSYS

NOV212015

14:07:16

MainMenu>Preprocessor>l\/leshing>SizeCntrls>ManualSize>Global>Size

MainMenu>Preprocessor>Meshing>SizeCntrls>ManualSize>Lines>AllLines

MainMenu>Preprocessor>l\/leshing>SizeCntrls>ManualSize>Global>Size

IES1ZE]Globalelementsizesanddivisions(appliesonly

to"unsized*lines)

SIZEElementedgeten9th

ND1VNo.ofelementdivisions-

-(us«donlyifelemented9elength.SIZE,isblankorzero)

Cancel

LINESANS

LINENUMF

NOV15:

15:1：

5

MainMenu>Preprocessor>Meshing>MeshAttributes>DefaultAttribs

1

ELEMENTSL_XANSYS

NOV212015

14:09:56

(2)创建表面效应单元

UtilityMenu>Select>Comp/Assembly>CreateComponent

Main>Menu>Preprocessor>Modeling>Create>Elements>Surf/Contact>S

urfEffect>AttchtoFluid>linetoFluid

AN

NOV15

153

7、施加载荷

(1)流体入口温度

1

ELEMENTSANSYS

NOV212015

14:11:02

(2)管外壁对流

MainMenu>Preprocessor>Loads>DefineLoads>Apply>Thermal>Temperature>On

keypoints

ELEMENTSANSYS

ApplyCONVonLinesNOV152015

22:42:46

(•iPick1(〜Unpick

(•Single〜Box

CPolygon(、Circle

「Loop

Count=1

Maximum=€

Minimum=1

LineNo.=4

(•Li”ofItems

CMin,Max,Inc

OKApply

RegetCancel

PickAllHelp

AApplyCONVonlines次

[SFL]ApplyFilmCoefonlinesConstantvalue

IfConstantvaluethen:

VAUFilmcoefficientho|

[SFL]ApplyBulkTemponlinesConstantvalue▼

IfConstantvaluethen:

VAL2IBulktemperaturetbulk

IfConstantvaluethen:

OptionalCONVvaluesatendJofline

(leaveblankforuniformCONV)

VAUFilmcoefficient

VAL2JBulktemperature

OKICancelIHelp

1

ELEMENTS,LXAWSYS

NOV212015

14:11:02

(3)管内壁对流

MainMenu>Preprocessor>Loads>DefineLoads>Apply>Thermal>Convec

tion>OnElements>Unifom

AApplyCONVonelems

[SFE]ApplyUniformConvection(CONV)onElements

[SFE]ApplyFilmCoefonelems|Constantvalue二]

IfConstantvaluethen:

VAUFilmcoefficienthi

[SFE]ApplyBulkTemponelemsConstantvalue▼

IfConstantvaluethen:

VAL2IBulktemperature0

LKEYLoadkey,usuallyfaceno.

OKCancel

（4）管内流体质量流率

MainMenu>Solution>DefineLoads>Apply>Thermal>HeatFlux>On

Elements

8、求解

l.OE+Ol-

HEATCRIT

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NO

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u

u

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u

8

>

u

o

u

①

nJJ

T

o

s

q

Y

l.OE+OO

20

二三

CumulativeIterationNumber

9、后处理

24.965534.896544.827554.758564.6894

APRNSOLCommand耳

File

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PRINTTEMPNODALSOLUTIONPERNODE

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TIME=1.0000LOADCfiSE=0

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224.082

320.029

420.058

520.087

620.116

720.145

820.174

920.203

1020.203

1120.261

1220.290

1320.319

1420.348

1520.377

1620.406

1720.435

1820.464

1920.493

2020.522

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2520.667

2620.695

2720.724

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3220.839

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3420.926

3520.926

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3821.041

3921.069

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LOADSTEP=1SUBSTEP=1

TIME=1.0000LOADCASE=0

NODETEMP

4021.069

4121.127

4221.127

4321.184

4421.213

4521.213

4621.270

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6921.926

7021.954

7121.954

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7622.125

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*****P0ST1NODALDEGREEOFFREEDOMLISTING

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APRNSOLCommand宣

File

*****POST1NODALDEGREEOFFREEDOMLISTING

LOADSTEP=1SUBSTEP=1

TIME=1.0000LOADCASE=0

NODETEMP

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8022.238

8122.266

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8322.323

8422.351

8522.379

8622.407

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8822.464

8922.492

9022.520

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9422.633

9522.661

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9722.717

9822.745

9922.773

10022.801

10122.801

10222.858

10322.886

APRNSOLCommand声

File

1

PRINTTEMPNODALSOLUTIONPERNODE

*****POST1NODALDEGREEOFFREEDOMLISTING

LOADSTEP=1SUBSTEP=1

TIME=1.0000LOADCASE=0

NODETEMP

14964.689

15062.821

15164.687

15264.679

15364.669

15464.658

15564.646

15664.635

15764.623

15864.610

15964.596

16064.583

16164.569

16264.556

16364.543

16464.531

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16664.507

16764.495

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APRNSOLCommand叵

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17164.442

17264.428

17364.415

17464.403n

17564.391

17664.378三

17764.364

17864.351

17964.338

18064.326

18164.313

18264.300

18364.286

18464.274

18564.261

18664.248

18764.235

*****POST1NODALDEGREEOFFREEDOMLISTING

LOADSTEP=1SUBSTEP=1

TIME=1.0000LOADCASE=0

NODETEMP

18864.221

18964.209

19064.196

19164.183▼

APRNSOLCommand国

File

19264.169

19364.156

19464.143

19564.131

19664.118

19764.104

19864.091

19964.078

20064.066

20164.053

20264.039n

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21763.842

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21963.816

22063.803

22163.789

22263.775▼

八PRNSOLCommand

File

63.762

22463.750

22563.737

22663.724

**POST1NODALDEGREEOFFREEDOMLISTING

LOADSTEP=1SUBSTEP=1

TIME=1.0000LOADCASE=0

NODETEMP

22763.710

22863.697

22963.684

23063.671

23163.658

23263.644

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