digital flow benching, smoke query-esque.... sorta thing....
digital flow benching, smoke query-esque.... sorta thing....
(OP)
Hi all... Basically I have a slight issue. As a Uni assignment we were asked to flow a head. Fine and done... But I decided that what would be far better was validate a CFD model where I can do all the work digitally, including modifications. As part of this, Ive made (and are continuing to make) some basic tube sections such as this...


And some flow restrictors such as this....



and plan on running them through the flowbench with pressure and velocity sensors, plus a visulisation of smoke flowing through it all.
The problem is... I cant see the smoke...
http://smg.photobucket.com/albums/v66/Glaive/?acti...
So the question is... Does anyone have any idea's? I was thinking UV smoke. Or a chamber where I can make a smoke charge with a much higher concentration of smoke, or using combustable smoke pellets to increase density. But I'm at a bit of a loss... Anyone have any idea's?
While it was a Uni assignment that made me start this project... Its not an assignment, or homework or anything like it. It just piqued my intetrest... Plus I like the look of Ansys.
So anyone fancy pitching in?
Thanks in advance,
Chris.


And some flow restrictors such as this....



and plan on running them through the flowbench with pressure and velocity sensors, plus a visulisation of smoke flowing through it all.
The problem is... I cant see the smoke...
http://smg.photobucket.com/albums/v66/Glaive/?acti...
So the question is... Does anyone have any idea's? I was thinking UV smoke. Or a chamber where I can make a smoke charge with a much higher concentration of smoke, or using combustable smoke pellets to increase density. But I'm at a bit of a loss... Anyone have any idea's?
While it was a Uni assignment that made me start this project... Its not an assignment, or homework or anything like it. It just piqued my intetrest... Plus I like the look of Ansys.
So anyone fancy pitching in?
Thanks in advance,
Chris.





RE: digital flow benching, smoke query-esque.... sorta thing....
Start by just playing with lighting and background.
Try to get rid of the lighting reflections on the tubes. A solid dark background instead of half dark and half windows.
Maybe try an old-school black light.
RE: digital flow benching, smoke query-esque.... sorta thing....
RE: digital flow benching, smoke query-esque.... sorta thing....
Alternatively, oil and chalk, smeared on the walls, for visualization of boundary layer flows.
Third, telltales or short pieces of yarn, either attached to walls or along short wire "rakes".
A higher frame rate camera, or flash photos, to better "freeze" the motion.
Google Schlieren photography. Oh and Raman spectroscopy, but I don't know if you want to go that elaborate.
Lots of ideas, sorry about that.
RE: digital flow benching, smoke query-esque.... sorta thing....
RE: digital flow benching, smoke query-esque.... sorta thing....
Franz
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RE: digital flow benching, smoke query-esque.... sorta thing....
It was basically a vacuum cleaner and a smoke machine to test the theory and get an idea of smoke visulisation... The next step is really lighting and combustable smoke, rather than smoke machine generated smoke. The issue is, it has to be at a high speed, as the flow bench opporates in that area.
The thing of it is, I need to keep it all pretty simple as I still have all my actual assignments to be doing and i cant really spend too much time looking at "interesting"... As well as this, theres a friction study of an engine, head development, hub centreed steering and gemotry work that needs doing.
But I think your stuff might be interesting over the holidays... And dont worry... No Sulphur based smoke [pipe]
RE: digital flow benching, smoke query-esque.... sorta thing....
I wrote out instructions to make smoke b-o-m-b-s with pottasium nitrate and sugar, but deleted it because these days it would probably get you arrested. Maybe try the small round commercial ones if you can.
RE: digital flow benching, smoke query-esque.... sorta thing....
RE: digital flow benching, smoke query-esque.... sorta thing....
RE: digital flow benching, smoke query-esque.... sorta thing....
Regards
Pat
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