Mixing Efficiency of a T- Joint using Ansys Fluent
Introduction -
A mixing tee is a t joint which is used to mix same fluids with different temperatures or different fluids with different temperatures.
Here in this project we will be analysizing two models of mixing tee, one short and other long.
Different conditions:
1) Short mixing tee with momentum ratio as 2 and hot inlet velocity as 3 m/s.
2) Long mixing tee with momentum ratio as 2 and hot inlet velocity as 3 m/s.
3) Short mixing tee with momentum ratio as 4 and hot inlet velocity as 3 m/s.
Procedure:
Firstly we will open Ansys Workbench and select the Fluent as analysis System
We will be performing geometry cleaning and preparing the geometry in Spaceclaim.
then the meshing will be done in the ansys Mesher.
Following that the meshed model will be opened in Fluent where the boundary conditions,convergence crietria and all other values required for analysis will be given
By solving the model in Fluent, we will get the convergence,Average outlet temperature and average standard deviation.
lastly opening the cfd post to see the temperature and velocity contours of the mixing tee.
Project report on Mixing Effiency of Mixing Tee:
CASE 1- Short mixing tee with hot inlet velocity of 3m/s and momentum ratio of 2.
Velocity at cold inlet = 6m/s
Model -
Mesh of Short Mixing Tee-
Element size - Default.
Cell count-12646
Mesh Quality of Short Mixing Tee-
Convergence Plot -
No. of iterations for convergence - 243 iterations
Average outlet temperature plot -
Average outlet temperature - 19.85 degree celcius.
Average Standard Deviation Plot -
Average Standard deviation- 1.6 degree celcius
RESULTS:
Temperature-
Here Temperature is in Kelvin.
Velocity-
CASE 2- Long Mixing Tee with 3m/s hot inlet velocity and Momentum ratio of 2.
Velocity at cold inlet - 6m/s
Model -
Mesh of long mixing tee-
Element size - Default.
Cell Count - 15771
Mesh quality of long mixing tee -
Convergence Plot -
No. of iterations for Convergence - 158 iterations
Average Outlet temperature plot -
Average outlet temperature - 20 degree celcius
Average Standard deviation plot -
Average Standard deviation - 1 degree celcius
Results -
Temperature -
here in this image temperature is in kelvin.
Velocity -
CASE 3 - Short mixing tee with 3m/s hot inlet velocity and momentum ratio of 4.
cold inlet velocity - 12m/s
Model -
Mesh of mixing tee -
Element size - Default.
No. of Cells - 12646
Mesh Quality -
Convergence Plot -
No. of iterations for convergence - 187 iterations
Average Outlet temperature plot -
Average outlet Temperature - 17.5 degree celcius
Average Standard deviation plot -
Average Standard deviation - 0.7750 degree celcius
Results-
Temperature-
here in the below image the temperature is in Kelvin
Velocity-
Table of Mixing Tee-
Conclusion-
1) As the velocity of cold inlet increases keeping the hot inlet velocity constant, the mixing takes place effectively resulting in low temperature outlet.
2) There is no to minimum effect of the length of mixing Tee on the outlet temperature.