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-   -   Evaporation of water... help needed!! (https://www.cfd-online.com/Forums/fluent/45883-evaporation-water-help-needed.html)

Arpit August 30, 2007 03:51

Evaporation of water... help needed!!
 
Dear all,

I am stuck with the following problem: I have a 2d slab filled with water and i m supplying a constant heat flux at one of its edge. As heat penetrates inside, the water should evaporate and get converted to vapor. I define it as a multiphase model and use the UDF DEFINE_HET_RXN_RATE {http://www.fluentusers.com/fluent6326/doc/ori/html/udf/node56.htm}

I have tried using VOF/mixture models as they suit my purpose. I define phase I as air+water vapor(primary phase) and phase II as water liquid. In the interation panel ...I define a reaction phase 2 (water liquid)----->phase1 water vapor.

When i define the reaction rate function as none..it does not solve for the species balance. When i give that as population balance (as no other option is available) it gives the error:

Error: > (greater-than) : invalid argument [2]: wrong type [not a number] Error Object: nan

I don't know what to do..I have looked at all previous discussion regarding evaporation on the forum but can't get how to simulate this. I would appreciate any help in this.

Thanks a lot!!! _________________ Regards, Arpit

rachit September 10, 2007 10:00

Re: Evaporation of water... help needed!!
 
Dear arpit , i am also very much interested to find out the solution of this very general problrm and like u i also tried a lot to find out the suitable model for same , unfortunately able to find the same in fluent.

i will be very thankful to all users on this forum to help me in this regard.

rachit

rachit September 10, 2007 10:04

Re: Evaporation of water... help needed!!
 
Dear arpit , i am also very much interested to find out the solution of this very general problrm and like u i also tried a lot to find out the suitable model for same , unfortunately i also failed to find the same in fluent.

i will be very thankful to all users on this forum to help me in this regard.

rachit


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