[ali.soufan]

Hello everyone,
My project needs 4 co sources every source has flow rate 0.6 L/min.
Which TYPE in boundary conditions should i choose in this case ?????
I tried to choose mass-flow inlet but its unit in kg/s.
Any help or note to give

[fluid23]

It is an arbitrary exercise to convert from volume flow rate (L/min) to mass flow rate (kg/s).

Mass Flow = Density * Volume Flow.

Just make sure that you convert your volume flow rate into m^3/sec and specify density as kg/m^3.

That of course assumes that you know either density or pressure and temperature of the incoming fluid. If not, your problem is under-defined.

[fluid23]

I guess I should have asked, does CO mean carbon-monoxide?

[ali.soufan]

Yes its carbon-monoxide.
Thank u so much

[ali.soufan]

What if i have 4 cylinders every cylinder gives 75 watt for example which type should i choose???

[Radwanma]

Hi all,

I have this problem in FLUENT :


WARNING: Limited wall distance for 241 cells to 1.000000e-12.
Please inspect the wall distance by displaying the
contours of the 'Cell Wall Distance' at the
boundaries. If you observe any irregularities we
recommend the use of an alternative algorithm to
correct the wall distance.
Please select /solve/initialize/repair-wall-distance
using the text user interface to switch to the
alternative algorithm.

Do you know the reasons of this problem?!!!!

[fluid23]

Radwama: It sounds like you have issues with your cells being to close to the wall. You should really post this in the Fluent formum...

Ali: Are you trying to apply this to your mass flow inlet or a wall near the mass flow inlet? I am a little confused.

[ali.soufan]

Haha i am sorry look i am working on small project consist of:
-room (2.5*2.5*3 m).wall temp 28 kalvin.
-4 cylinders of diameter 0.3 m each one at temp 34 kalvin and gives 75 watt and they are symmetric to each other in this room.
-4 co source placed at top of cylinders each source gives 0.6 L/min.
-air supply (1.5*0.2m) gives 1.5 kg/s at temp 28 kalvin.
-exhaust (0.6*0.6m).
So which type should i choose for cylinders?

[fluid23]

That really depends on your software package. However, you can probably specify a wall boundary condition with a heat flux component. (w/m^2).

[ali.soufan]

Thank uuuuuuu