Resultados Simulacion Valve Ball

8/13/2019 Resultados Simulacion Valve Ball

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UNIVERSID D N CION L DE TRUJILLO

FACULTAD DE INGENIERIA

ESCUELA DE INGENIERIA MECNICA

Curso: Mecnica de Fluidos II.

Docente: Ms.Ing. Luis Julca Verstegui. .

Trujillo 2 11AlumnoVsquez Arribasplata Gilmer Fidel


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PRCTICA DE AULA

Anlisis de la influencia del ngulo de apertura en las prdidas de carga enuna vlvula de globo o determinacin del coeficiente de prdidas de la vlvulaK.

OBJETIVOS:1. Hallar las prdidas de carga de los conductos L1y L2.2. Hallar la influencia del ngulo () o ngulo de apertura de la vlvula

sobre el coeficiente de prdidas.

DATOS PARA LA SIMULACIN

1.De=Ds=20 mm.2.Longitud de desarrollo = L1= L2= 3. Material: Fundicin de hierro maleable, e=0,26 mm4.Q= Caudal volumtrico=0.005 m3 Pe,Ps,P1,P2son presiones estticas.5.Fluido: agua (=1000 Kg/m3.

CONSIDERACIONES PARA EL FLUJO: Fluido incompresible. Flujo permanente. Sistema Adiabtico y aislado. T=293.15K (dada en la entrada) Flujo sin gravedad.


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COMENTARIO SOBRE LA VLVULA.Cuando se ve el ensamblaje de la vlvula en SolidWorks se puede notar queesta est cerrada completamente a partir de los 51. Pero se har unasimulacin tomando 60 para observar el comportamiento de la simulacin ylos resultados.

CLCULOS.Velocidad :

Reynolds:

Longitud de las tuberas igual a la longitud de desarrollo:

PROCEDIMIENTO PARA OBTENER EL COEFICIENTE DEPRDIDAS.Se tiene que las prdidas totales son iguales a:

Se tiene que para 0 las prdidas de las vlvula son cero as que para estengulo se tiene:

Y se da que en la salida.Luego para cualquier otro ngulo se tendr que:

Y las pedidas totales sern:

Luego despejando K queda:FORMULA (A)

Donde se determina cuando la vlvula est a 0.


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RESULTADOS DE LA SIMULACIN PARA DETERMINAR LAPRESION DE ENTRADA SEGN EL NGULO DE APERTURA DE

LA VLVULA.

System InfoProduct Flow Simulation 2011 0.0. Build: 1440Computer name GLMERVASQUEZAUser name Glmer Vasquez AProcessors Intel(R) Core(TM) i5 CPU M 430 @

2.27GHzMemory 3894 MB / 8388607 MBOperating system Service Pack 1 (Build 7601)CAD version SolidWorks 2011 SP0.0

CPU speed 2267 MHz

General I nfo

Model C:\Users\Glmer Vasquez A\Desktop\MASDOCUMENTOS\VII\MECNICA DEFLUIDOS II\LABORATORIOCFD\II\FloWorks\ball valve.sldasm

Project name Analisis de valvula globo #Project path C:\Users\Glmer Vasquez A\Desktop\MAS

DOCUMENTOS\VII\MECNICA DE

FLUIDOS II\LABORATORIOCFD\II\FloWorks\6Units system SI (m-kg-s)Analysis type InternalExclude cavities without flow conditions OnCoordinate system Global coordinate systemReference axis X

Initial Mesh SettingsAutomatic initial mesh: OnResult resolution level: 5

Advanced narrow channel refinement: OffRefinement in solid region: OffGeometry ResolutionEvaluation of minimum gap size: AutomaticEvaluation of minimum wall thickness: AutomaticComputational Domain

Size

X min -0.713 mX max 0.713 m


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Y min -0.010 mY max 0.010 mZ min -0.010 mZ max 0.010 m

Boundary Conditi ons

2D plane flow NoneAt X min DefaultAt X max DefaultAt Y min DefaultAt Y max DefaultAt Z min DefaultAt Z max Default

Physical Features

Heat conduction in solids: Off

Time dependent: OffGravitational effects: OffFlow type: Turbulent onlyCavitation: OffHigh Mach number flow: OffDefault roughness: 260.0 micrometerDefault wall conditions: Adiabatic wall

Initial ConditionsThermodynamic parameters Static Pressure: 101325.00 Pa

Temperature: 293.20 K

Velocity parameters Velocity vectorVelocity in X direction: 0 m/sVelocity in Y direction: 0 m/sVelocity in Z direction: 0 m/s

Material Settings

Fluids: Water

Boundary ConditionsInlet Volume Flow 1

Type Inlet Volume FlowFaces Face Coordinate system Face Coordinate SystemReference axis XFlow parameters Flow vectors direction: Normal to face

Volume flow rate normal to face: 0.0050 m^3/sFully developed flow: Yes

Thermodynamic parameters Temperature: 278.00 K

Static Pressure 1


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Type Static PressureFaces Face Coordinate system Face Coordinate SystemReference axis XThermodynamic parameters Static pressure: 400000.00 Pa

Temperature: 293.00 K

Goals -Surface GoalsSG Av Static Pressure 1Type Surface GoalGoal type Static PressureCalculate Average valueFaces Cara@LID1-1Coordinate system Global coordinate systemUse in convergence On

SG Av Velocity 1

Type Surface GoalGoal type VelocityCalculate Average valueFaces Cara@LID2-1Coordinate system Global coordinate systemUse in convergence On

Calculation Control Options

F in ish Conditi ons

Finish conditions If one is satisfiedMaximum travels 4.000Goals convergence Analysis interval: 0.500

Solver Ref inement Ref inement: Di sabled

Resul ts Saving

Save before refinement On

Advanced Control Options- F low Freezing

Flow freezing strategy Disabled

DMNSOED


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LA TUBERA DE ENTRADA (IGUAL PARA LA SAL IDA) EST DADA POR LA LONGITUD ENQUE EL F LUJO SE CONVIERTE EN COMPLETAMENTE DESARROLL ADO.

REFERENCIA DE LOS ANGULOS DE APERTURA DE LA VALVULA, TOMADA DESDE ELEJE CENTRAL DE LA TUBERA.


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POSICIONAM IENTO DE LA ESFERA PARA UN NGULO DADO.


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RESULTADOS


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ANALISI S DE VALVULA GLOBO 0

General InfoIterations: 169CPU time: 1091 s

LogMesh generation started 23:00:39 , Jun 15Mesh generation normally finished 23:00:55 , Jun 15Preparing data for calculation 23:00:58 , Jun 15Calculation started 0 23:01:04 , Jun 15Calculation has converged since the followingcriteria are satisfied: 168

23:19:57 , Jun 15

Goals are converged 168Calculation finished 169 23:20:11 , Jun 15

Calculation MeshBasic Mesh Dimensions

Number of cells in X 362Number of cells in Y 6Number of cells in Z 6

Number Of Cell s

Total cells 103136Fluid cells 62464

Solid cells 8752Partial cells 31920Irregular cells 0Trimmed cells 0

Maximum refinement level: 1

GoalsName Unit Value Progress Use in convergence Delta CriteriaSG AvStaticPressure 1

Pa 1319624.44 100 On 1623.42086 8927.67081

SG AvVelocity 1

m/s 15.913 100 On 0.00277631927

0.00330529118

Min/Max TableName Minimum MaximumPressure [Pa] -128927.59 1320331.61Temperature [K] 277.97 278.32


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Velocity [m/s] 0 47.143X - Component of Velocity[m/s]

-8.314 47.143

Y - Component of Velocity[m/s]

-17.394 17.511

Z - Component of Velocity[m/s]

-17.665 17.692

Fluid Temperature [K] 277.97 278.32Shear Stress [Pa] 0 17724.68Heat Transfer Coefficient[W/m^2/K]

0 0

Surface Heat Flux [W/m^2] 0 0Density [kg/m^3] 1000.57 1000.63

ANALISI S DE VALVULA GLOBO 5


Calculation Mesh

Basic Mesh Dimensions


Number Of Cell s

Total cells 103276Fluid cells 62452Solid cells 8844Partial cells 31980


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Irregular cells 0Trimmed cells 20


GoalsName Unit Value Progress Use in

convergence

Delta Criteria

SG AvStaticPressure 1

Pa 1503212.03 100 On 11208.8265 11823.2427

SG Av X -Componentof Velocity1

m/s -15.984 100 On 0 1.59840776e-007

Min/Max Table

Name Minimum MaximumPressure [Pa] -224280.50 1505282.47Temperature [K] 293.15 293.55Velocity [m/s] 0 51.403X - Component of Velocity[m/s]

-51.386 13.050


-18.915 18.920


-19.590 16.635

Fluid Temperature [K] 293.15 293.55

Shear Stress [Pa] 0 23230.07Heat Transfer Coefficient[W/m^2/K]

0 0


ANAL ISI S DE VALVULA GLOBO 10


Log

Mesh generation started 21:08:29 , Jun 14Mesh generation normally finished 21:08:46 , Jun 14Preparing data for calculation 21:08:49 , Jun 14Calculation started 0 21:08:56 , Jun 14Calculation has converged since the following 21:29:36 , Jun 14


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criteria are satisfied: 182Goals are converged 182

Calculation finished 183 21:29:49 , Jun 14

Calculation Mesh



Number Of Cell s

Total cells 103388Fluid cells 62408Solid cells 8904Partial cells 32076Irregular cells 0Trimmed cells 8



convergenceDelta Criteria


Pa 1941017.23 100 On 3036.90381 26760.6131

SG AvVelocity 1

m/s 15.914 100 On 0.00312036237

0.00331366953

Min/Max TableName Minimum MaximumPressure [Pa] 1939361.14 1943088.28

Temperature [K] 277.80 278.66Velocity [m/s] 0 71.634X - Component of Velocity[m/s]

-24.309 71.508


-22.146 22.131


-36.496 22.943

Fluid Temperature [K] 277.80 278.66Shear Stress [Pa] 0 39636.50


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Heat Transfer Coefficient[W/m^2/K]

0 0




Log

Mesh generation started 21:08:29 , Jun 14Mesh generation normally finished 21:08:46 , Jun 14Preparing data for calculation 21:08:49 , Jun 14Calculation started 0 21:08:56 , Jun 14Calculation has converged since the followingcriteria are satisfied: 182

21:29:36 , Jun 14


Calculation MeshBasic Mesh Dimensions


Number Of Cell s






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Pa 2766798.51 100 On 3036.90381 26760.6131

SG AvVelocity 1

m/s 15.914 100 On 0.00312036237

0.00331366953

Min/Max TableName Minimum MaximumPressure [Pa] -632632.17 2767503.94Temperature [K] 277.80 278.66Velocity [m/s] 0 71.634X - Component of Velocity[m/s]

-24.309 71.508

Y - Component of Velocity[m/s] -22.146 22.131


-36.496 22.943


0 0



General I nfo

Model C:\Users\Glmer Vasquez A\Desktop\MASDOCUMENTOS\VII\MECNICA DEFLUIDOS II\LABORATORIO


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CFD\II\FloWorks\ball valve.sldasmProject name ANLISIS VLVULA DE GLOBO 20 (5)Project path C:\Users\Glmer Vasquez A\Desktop\MAS

DOCUMENTOS\VII\MECNICA DEFLUIDOS II\LABORATORIOCFD\II\FloWorks\6

Units system SI (m-kg-s)

Analysis type InternalExclude cavities without flow conditions OnCoordinate system Global coordinate systemReference axis X


Log


18:44:16 , Jun 18


Warnings: Negative pressure Minimum pressure=-1.24239e+006 Pa; dV/V=4.6988

Calculation Mesh



Number Of Cell s



GoalsName Unit Value Progress Use in Delta Criteria


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convergenceSG AvStaticPressure 1

Pa 4373153.98 100 On 23180.0188 54481.1266

SG Av X -Componentof Velocity

1

m/s 15.962 100 On 0 1.59622872e-007

Min/Max TableName Minimum MaximumPressure [Pa] -1242388.19 4374809.42Temperature [K] 292.66 294.24Velocity [m/s] 0 89.729X - Component of Velocity[m/s]

-29.753 88.637

Y - Component of Velocity

[m/s]

-36.853 36.924


-65.129 64.425


0 0




Log


00:23:41 , Jun 15



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Calculation Mesh


Number of cells in X 336

Number of cells in Y 4Number of cells in Z 6

Number Of Cell s






Pa 1.61e+007 100 On 1558.09644 253587.046

SG AvVelocity 1

m/s 15.615 100 On 0.00434710205

0.00458073527

Min/Max TableName Minimum MaximumPressure [Pa] -4698233.20 1.61e+007Temperature [K] 277.04 281.90Velocity [m/s] 0 149.239X - Component of Velocity[m/s]

-42.861 139.942


-82.903 84.933


-86.491 79.812


0 0



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Log


14:56:20 , Jun 19



Calculation Mesh




Number Of Cell s

Total cells 281552Fluid cells 147116Solid cells 50408Partial cells 84028Irregular cells 0


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Trimmed cells 16





Pa 8.45e+007 100 On 783273.384 1128525.09

SG Av X -Componentof Velocity1

m/s 15.952 100 On 0 1.59517326e-007

Min/Max TableName Minimum Maximum

Pressure [Pa] -1.96e+007 8.45e+007Temperature [K] 282.66 308.78Velocity [m/s] 0 335.239X - Component of Velocity[m/s]

-96.522 298.449


-146.934 147.143


-191.751 159.048

Fluid Temperature [K] 282.66 308.78Shear Stress [Pa] 0 798390.07

Heat Transfer Coefficient[W/m^2/K]

0 0



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Log


03:00:50 , Jun 15



Calculation Mesh



Number Of Cell s






Pa 3.15e+008 100 On 388590.546 3461848.96

SG AvVelocity 1

m/s 15.966 100 On 0.00682016258

0.00691479553


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Min/Max TableName Minimum MaximumPressure [Pa] -2.88e+007 3.15e+008Temperature [K] 253.88 352.24Velocity [m/s] 0 562.867X - Component of Velocity[m/s]

-145.178 561.641


-288.357 290.549


-434.411 340.491


0 0





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Log


20:07:53 , Jun 18



Calculation Mesh




Number Of Cell s






Pa 1.63e+010 100 On 108159308 109152416

SG Av X -Component

of Velocity1

m/s -15.954 100 On 0 1.59544129e-007

Min/Max TableName Minimum MaximumPressure [Pa] -9.19e+008 1.63e+010Temperature [K] 2.75 2826.99Velocity [m/s] 0 4109.324X - Component of Velocity -4107.713 672.194


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[m/s]Y - Component of Velocity[m/s]

-1130.396 1124.890


-887.387 1293.434

Fluid Temperature [K] 2.75 2826.99Shear Stress [Pa] 0 3.53e+008

Heat Transfer Coefficient[W/m^2/K] 0 0



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Log


16:11:17 , Jun 15


Warnings: A vortex crosses the pressure opening Boundary Condition : Static Pressure 1 ; Inletflow/outlet flow=1.00082

Calculation Mesh



Number Of Cell s






Pa 101325.00 100 On 0 0.00101325

SG AvVelocity 1

m/s 1.351e-008 100 On 1.25446729e-009

1.34864232e-009


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Min/Max TableName Minimum MaximumPressure [Pa] 101325.00 400000.00Temperature [K] 278.00 293.20Velocity [m/s] 0 1.322e-006X - Component of Velocity[m/s]

-1.233e-006 1.297e-006


-8.735e-007 7.348e-007


-7.859e-007 9.364e-007

Fluid Temperature [K] 278.00 293.20Shear Stress [Pa] 0 1.72e-007Heat Transfer Coefficient[W/m^2/K]

0 0



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RESULTADOS DE LA PRESION DE ENTRADA SEGN ELANGULO DE APERTURA DE LA VALVULA-.

NGULO DE APERTURA DE

LA VLVULA

PRESION DE

ENTRADA (Pa)0 1319624.445 1503212.0310 1941017.2315 2766798.5120 4373153.9830 1.61e+007

40 8.45e+00745 3.15e+00850 1.63e+01060


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De la tabla anterior se tiene la respuesta al primer objetivo planteado dadoque para 0 las perdidas son solo para la tubera entonces:

Y el coeficiente de prdida de carga se halla de acuerdo a la FRMULA (Adada en la pgina 3.


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NGULO DE APERTURADE LA VLVULA

COEFICIENTE DEPRDIDAS K.

5 1.449610 4.907615 11.427320 20.111230 116.7084

40 656.80645 2476.873550 128697.216260


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Grfica del coeficiente

de resistencia de la

vlvula globo versus elAngulo que se desplaza

la llave la vlvula de

globo.


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Conclusiones:Respecto a la grfica se puede decir que el factor de prdidas se hacemuy grande cuando el ngulo pasa de los 45 y debido adems que lostiempos de simulacin para ngulos cercanos al ngulo de cierre sonbastante largos.Respecto al resultado para el ngulo de 60 el programa arroja lapresin atmosfrica y una velocidad cero para la parte de entrada ycomo se sabe al estar completamente cerrada no tiene sentido evaluar elcoeficiente de prdidas y es por eso que el programa nos arroja que lapresin de entrada es la exterior que se da en la simulacin, aunque paraun ngulo de cierre total y segn la grfica se puede decir que elcoeficiente tiende a infinito.Para aplicaciones con la vlvula y para tener mayor exactitud en elclculo de prdidas sera ptimo que se realicen las simulaciones

primera entre 0 y 30 y luego entre 30 y 50 debido a que a partir de30 el coeficiente se incrementa muy rpido y con valores muy altos.

Resultados Simulacion Valve Ball

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