CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   DPM slow evaporation (http://www.cfd-online.com/Forums/fluent/38766-dpm-slow-evaporation.html)

Vix November 29, 2005 06:36

DPM slow evaporation
 
Hello, all. I am having difficulties with simulating a fuel oil burner. The droplets evaporate too slow, and the reactions and PDF mixture fraction appear only around the cone generated by the swirling air in the middle.

Does anyone have experience with this situation?

Allan Walsh November 29, 2005 12:35

Re: DPM slow evaporation
 
Are drop diameters in the right range? What about the latent heat of vaporization?

Vix November 29, 2005 13:27

Re: DPM slow evaporation
 
When I minimise the diameters (25e-06) I still don't get an acceptable evap. speed.........And the latent heat is the default one for the fuel oil...........

Can I maybe initialise the solution in such a way that my droplets evaporate quickly (high temperature)????

Giulio November 30, 2005 14:38

Re: DPM slow evaporation
 
Hi, I don't know if this may be useful but, did you try to see if the value of the satured vapor pressure is correct or not? I had a similar problem when I was simulating a water injection inside a stream of air, and it was due to the incorrect satured vapor pressure value.

Giulio


All times are GMT -4. The time now is 19:50.