Mixing efficiency of Tee joint using ANSYS FLUENT
OBJECTIVE: To setup the steady-state simulation and compare the mixing effectiveness of the following cases-
- Case 1
- Short mixing tee with hot inlet velocity of 3m/s
- Momentum ratio of 2
- Case 2
- Long mixing tee with hot inlet velocity of 3m/s
- Momentum ratio of 2
- Case 3
- Short mixing with hot inlet velocity of 3 m/s
- Momentum ration of 4
INTRODUCTION:
PROCEDURE:
Step 1) Pre-Processing
1.1) Geometery
- Open SpaceClaim, import the model of mixing tee short pipe pr mixing tee Long pipe as per the case.
- Prepare the solid model, do volume extraction by selecting edges.
- Deselect the solid and suppress it for physics.
Fig: Body used in the simulation
1.2) Meshing and Naming
- Start meshing and use hit and trial method with scientific guessing to select the element size. I experimentally perform the mesh generation from element size 7mm and finally chose the element size of 3mm to get fine results.
- Go to mesh quality and select Element Quality in Mesh Metric to know the quality of mesh generated. Results above than 0.5% are accepted.
- Give proper naming of all part of the body like Inlet-X, Inlet-Y, Walls, and Outlet.
- Cut the plane into the middle of the body to get a better understanding.
Step 2) Solving
OUTPUT & RESULT
CASE 1: Momentum ratio = 2, SHORT PIPE.
As momentum ratio = velocity at cold inlet / velocity at hot inlet
Velocity at the cold inlet = 6 m/s
The mesh is made of
Fig: Quality of Mesh
Residual graph-
We can observe that the convergence started from around 130 iteration.
Area -weighted Temperature graph-
Average outlet temperature comes out to 19.85-degrees Celcius.
Standard deviation graph-
Standard deviation got converged around 1.50.
Temperature contour-
Fig: Temperature contour
Velocity contour-
Fig: Velocity contour
No. of cells = ( Nodes = 8337) & (Element = 39731)
CASE 2: Momentum ratio = 2, LONG PIPE.
The same kind of mesh is used as one used in case 1 short pipe.
Fig: Quality of Mesh
Residual graph-
We can observe that the convergence started from around 130 iteration.
Area -weighted Temperature graph-
Average outlet temperature comes out to 19.85-degrees Celcius.
Standard deviation graph-
Standard deviation got converged around 1.50.
Temperature contour-
Fig: Temperature contour
Velocity contour-
Fig: Velocity contour
NO. of cells = ( Nodes = 11710) & ( Element = 56528)
CASE 3: Momentum ratio = 6, SHORT PIPE.
The same kind of mesh is used as one used in case 1 short pipe.
Fig: Quality of Mesh
Residual graph-
We can observe that the convergence started from around 130 iteration.
Area -weighted Temperature graph-
Average outlet temperature comes out to 19.85-degrees Celcius.
Standard deviation graph-
Standard deviation got converged around 1.50.
Temperature contour-
Fig: Temperature contour
Velocity contour-
Fig: Velocity contour
No. of cells = ( Nodes = 8337) & (Element = 39731)
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