[hensa]

Hi,

I'm evaluating the mixing performance of a static mixer in terms of thermal homogenization in a square duct. The Reynolds number is approximately 500.000 and the temperature range (in a plane) just before the static mixer is approximately 300 K. The purpose of my work is to improve the static mixer, by changing its geometry, such that better mixing is acquired. However, I'm restricted to using 2-eq RANS models because of the limited available computer resources.

My results, in terms of mixing, are quite under-predicted compared to what is measured and I've read some articles that this often is the case when evaluating mixing using RANS models. The reason being the lack of turbulent structures and that the turbulent prandtl number is often is flow dependent (i.e. it often needs to be lowered to have results that agree to experiments)

I only have one operating condition to compare with (which is under-predicted in terms of mixing by RANS) and for this reason I'm considering doing a benchmark on some suitable flow case to see how my solver is performing, and to see if trends of different mixer concepts can even be captured.

So my question is, does anyone know of a good benchmarking case with available experimental data? Without going into much detail, the mixer is essentially a vortex generator placed in the centre of a square duct.

With kind regards,
Henrik

[pconen]

Dear Hensa,

have you gotten any further on this?
I am also looking for a case to validate my settings.
If someone still has a simulation of static mixers that he could make available to me, I would be very grateful!

[hensa]

Hi
Sorry no, I never found any benchmarking case or any other method to validate my model. Good luck, hopefully some data is now available since 4 years have passed //Henrik

[pconen]

Dear Hensa,

thanks for reply. Did you find another way to match your simulation?