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yorelchr December 16, 2012 10:03

cross-shaped mixer
 
hello everyone,

I am doing simulations on a 3D cross-shaped micromixers.
In order to study the mixing quality of the cross-shaped micormixer, I have to use 2 liquids. Both with same properties of water at 20C. One introduced in inlet1, the other in inlet 2.
So in inlet 1 I can put liquid water.
In inlet 2, how should I proceed? all I have read on internet is confusing me.
Should I create a second fluid called "dye", for example: I take liquid water in the database, change the name and cancel the chemical formula. Then?
Thank you for any help. It is really urgent !

Last question: I must use pressure outlet with atmsopheric pression. As in Fluent, the operating pressure is set to 101325 Pa, do I have to write it again in the oulet for the Gauge pressure? I don't really understand that.
thanks for any help !!!

yorelchr December 16, 2012 13:01

injections, particle tracking, DPM
 
Quote:

Originally Posted by yorelchr (Post 397770)
hello everyone,

I am doing simulations on a 3D cross-shaped micromixers.
In order to study the mixing quality of the cross-shaped micormixer, I have to use 2 liquids. Both with same properties of water at 20C. One introduced in inlet1, the other in inlet 2.
So in inlet 1 I can put liquid water.
In inlet 2, how should I proceed? all I have read on internet is confusing me.
Should I create a second fluid called "dye", for example: I take liquid water in the database, change the name and cancel the chemical formula. Then?
Thank you for any help. It is really urgent !

Last question: I must use pressure outlet with atmsopheric pression. As in Fluent, the operating pressure is set to 101325 Pa, do I have to write it again in the oulet for the Gauge pressure? I don't really understand that.
thanks for any help !!!


I am trying to do as this:
Define/Injection/create/
- injection type : surface - from inlet 2
- inert
- material : anthracite (the default one) : how should I choose something that would have same properties as water?
- diameter distribution : uniform
- point properties : x,y and z-vel are set by default to 0, should I put the velocity I put for the water to enter?
diameter : 0.001
temp : 300K

Then I go to Discrete Phase Model, max number of steps to 500 and that's all?
Then I launch calculations?
I really need your help !!!!!

yorelchr December 16, 2012 14:40

Quote:

Originally Posted by yorelchr (Post 397794)
I am trying to do as this:
Define/Injection/create/
- injection type : surface - from inlet 2
- inert
- material : anthracite (the default one) : how should I choose something that would have same properties as water?
- diameter distribution : uniform
- point properties : x,y and z-vel are set by default to 0, should I put the velocity I put for the water to enter?
diameter : 0.001
temp : 300K

Then I go to Discrete Phase Model, max number of steps to 500 and that's all?
Then I launch calculations?
I really need your help !!!!!


I have modified a little what I have done before. Using particle tracking I have createt a particle named "dye" with same properties of water. But when I run calculations I have :
DPM Iteration ....
number tracked = 361, escaped = 0, aborted = 0, trapped = 0, evaporated = 0, incomplete = 361, incomplete_parallel = 0
Parallel particle tracking concurrency: 50%


Is it normal?
How can I have the concentration of the dye after calculations? nothing in the menu for that, just things as "residence time etc..." ...
please !!!! any help would be ok, I don't even know if what I'm doing has any sense and it's impossible to find anything clear on the net !!!!

I just need to find the way to determine the concentration of a "dye" that would be injected from one of the 2 inlets ......


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