4. Trapezoid Design Mixer
50 µm
Variables
Inlet Profile
Channel Width
Angles
Height
800 µm 30°
Length
400 µm
Simulations
Approximately 25 simulations run on various variables
Found Optimized Geometry for “Perfect” Mixing
Fabricated Design
Chose design that was not optimized via simulations but was
likely similar to the actual experimental result
Optimized Concentration Profile
12. Simulation conformed to Experiment:
Velocity and Concentrations
Fast (rate .1 cc/min; Concentration profile range -50 to 50)
Medium (rate .0096 cc/min; Concentration profile range -1.5 to 1)
Slow (rate .009 cc/min; Concentration profile range -.2 to 1.4)
18. Simulation vs. Experimental Results
Slope Slope
0.035
0.0308
0.0297
0.03
0.0274
0.0248
0.025
0.02
0.02 0.0184
0.015
0.01
0.005
0
Fast Mid Slow Fast Mid Slow
Simulation Experimental
19. Simulation vs. Experimental Results
% Error Simulation v. Experiment
35
30
25
Percent Error
20
15
10
5
0
Fast Mid Slow
% Error 33.11688312 16.4983165 32.84671533
20. Results Conclusion
Comsol Multiphysics
Useful for Design work
Easy to manipulate data to optimize
Difficult to gauge actual findings
Experiment compared to Simulations
Liked approach of beads and no beads
Would have liked running simulations with actual flow rates first
Overall Conclusions
Enjoyed have freedom to try many different design simulations
Found simulations were not good gage for experiment results in this case
Optimized Concentration Profile