steady state thermal analysis of a pipe intersection
TRANSCRIPT
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
1/20
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 .
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
2/20
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 .
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
3/20
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
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
4/20
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.
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
5/20
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.
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
6/20
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
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
7/20
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.
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
8/20
Pipe intersection
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
9/20
Quarter symmetry model of the
tankpipe intersection
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
10/20
Delete volume and below
d l f k
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
11/20
Quarter symmetry model of tank-pipe
intersection represented by a single
volume V1
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
12/20
Oblique view of mesh
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
13/20
Meshed quarter symmetry model of
tankpipe intersection
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
14/20
Load applied on surface of tank and
pipe
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
15/20
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
16/20
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
17/20
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.
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
18/20
Convection surface load displayed as
arrow
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
19/20
Temperature map on inner surface of
the tank and the pipe
-
7/29/2019 Steady State Thermal Analysis of a Pipe Intersection
20/20
Thermal nodal solution of the tank and
the pipe