Steady State Thermal Analysis of a Pipe Intersection

7/29/2019 Steady State Thermal Analysis of a Pipe Intersection

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Steady state thermal analysis of a pipe

intersection

A cylindrical tank is penetrated radially by a smallpipe at a point on its axis remote from ends ofthe tank.

The inside of tank is exposed to a fluid with atemperature of 232 c .The pipe experience asteady flow of fluid with a temperature of

38 C , and two flow regimes are isolated fromeach other by means of thin tube. Theconvection (film) coefficient in the pipe varieswith a metal temperature and is thus expressedas a material property .


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The objective is to determine the

temperature distribution at the Pipe-tank

junction Following data describing the problem are given :

Inside diameter of the pipe = 8 mm

Outside diameter of the pipe =10 mm

Inside diameter of tank = 26 mm Outside diameter of tank =30 mm

Inside bulk fluid temperature , tank = 232 C

Inside convection coefficient , tank = 4.92 W/m 2o C

Inside bulk fluid temperature , pipe = 38 o C

Inside convection coefficient (pipe) varies from about 19.68 to 39.36W/m 2o C .


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Provide information about variation of the thermal parameters with

temperature data given below :

Temperatureo C

21 93 149 204 260

Convection

coefficient

W/m 2o C41.92 39.85 34.64 27.06 21.746

Density (kg

/m 3 )7889 7889 7889 7889 7889

Conductivity

(J/s 0 C ).2505 .267 .2805 .294 .3069

Specific heat

(J/kg 0 C ) 6.898 7.143 7.265 7.445 7.631


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Assumption is consider during anaylsis

Quarter symmetry is applicable and that ,at the

terminus of the model (longitudinal and

circumferential cut in the tank).

There is sufficient attenuation of the pipe effect

such that these edges can be held at 232 o C

Boundary temperature along with the convection

coefficient and bulk fluid temperature are dealtwith in solution phase ,after which a static

solution is executed.


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Step follow during analysis

Prepare for a thermal anaylsis

1. Set preferences.

Input geometry

2. Read in the geometry of the pipe intersection

Define materials3.Define material properties vs. temperature.

4.Plot material properties vs. temperature.

5. Define element type

Generate mesh

6. Mesh of the modelApply load

7.Apply convection loads on exposed boundary lines.


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Obtain solution

8.Define analysis type

9. Examine solution control

10.Specify initial condition for the transient.

11.Set time ,time step size and related parameters.

12. Set output control

13. SolveReview result

14.Enter the time- history postprocessor and define variable

15.Plot temperature vs. time

16.Examine the results.

18.Exit the ANSYS program


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Result

Temperature contour and thermal flux display

are obtained in Post processing.

Convection surface load display by arrow

Temperature map on inner surface of the tank

and pipe

Distribution of thermal flux vectors atintersection between tank and pipe.


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Pipe intersection


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Quarter symmetry model of the

tankpipe intersection


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Delete volume and below

d l f k


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Quarter symmetry model of tank-pipe

intersection represented by a single

volume V1


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Oblique view of mesh


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Meshed quarter symmetry model of

tankpipe intersection


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Load applied on surface of tank and

pipe


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While ANSYS is solving the anaylsis ,the graphical solution tracking (GST)

monitor plot the Absolute convergence Norms as a function of the

Cumulative iteration Number. Notice that the solution is assumed to have

converged for values less than or equal to the convergence criteria.


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Convection surface load displayed as

arrow


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Temperature map on inner surface of

the tank and the pipe


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Thermal nodal solution of the tank and

the pipe

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Steady State Thermal Analysis of a Pipe Intersection