Week 1- Mixing Tee
Objective;
Here we have to set up a steady state simulation to compare mixing effectiveness when hot inlet temperature is 36 C and cold inlet temperature is 19C.
Procedure:
In these 2 cases we will use the k-omega model is used as it converged after a given number of iterations, this was not observed in the condition of k-epsilon.
Plots of k-epsilon model
Plots of k-omega model
Case 1: Condition 1
1.a)Using k-epsilon , Momentum Ratio of 2
Velocity contour plot along the pipe
Temperature contour along the pipe
Velocity contour across the pipe
Temperature contour acorss the pipe
Velocity line plot along the pipe
Temperature line plot along the pipe
Velocity line plot across the pipe
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Temperature line plot across the pipe
b) Momentum ratio of 4
Velocity contour plot along the pipe
Temperature contour plot along the pipe
Velocity contour across the pipe
Temperature contour across the pipe
Temperature line plot along the pipe
Tepmerature line plot across the pipe
Velocity line plot across the pipe
Case 1: Condition 2
1.a)Using k-omega, momentum ratio 2
Velocity contour
Temperature contour
Velocity line contour
Temperature line plot
b) k-omega, momentum ratio 4
Velocity contor plot
Temperature contour plots
Velocity line plots
Temperature line plots
Case 2:
Using k-omega, momentum ratio 2
Velocity contour plots
Temperature contour plots
Velocity line plots
Temperature line plots
b)k-omega,momentum ratio of 4
Velocity contour plots
Velocity Line plots
| Cell count | Average outlet temperature | Number of iterations of convergence | |
| Case 1 | 39721 | 30.1 | 148 |
| Case 2 | 56878 | 30.5 | 258 |
Mesh independent study
This allows mesh refinement without effecting results.After some tests we can be ensured by solution that mesh refinement wont effect the result.Due to this we can prepare less number of element mesh also for simulations.the main advantage here is to decrease the computaional time for solving.
Effect of length and momentum ratio
The outletb temperature is independent on the length of the mixing tee.By increasing in momentum ratio the outlet temperature is decreasing.
Conclusion
In this cahllenge we performed the analysis on a mixing tee and concluded by analysing various graphs and contours. We also provided a mesh independent study and discussed the effect of length and momentum ratio on the mixing tee for various values.