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-   -   Mass diffusion of surface exposed to water flow (http://www.cfd-online.com/Forums/fluent/39815-mass-diffusion-surface-exposed-water-flow.html)

Derek February 24, 2006 13:54

Mass diffusion of surface exposed to water flow
 
I'm modeling a fairly simple scenerio in Fluent. I have a rectangular channel (55mm x 2mm x 4mm LxWxH). Along one wall (4mm) I have a dissolvable tablet (4mm x 2mm LxH). Water is the fluid flowing thru the channel. There is no chemical reaction between the solid and the water, only dissolution. In setting up the species transport, do I select water as the "Selected species" and the solid as the "selected solid species?" This is assuming I'm using wall surface reaction model. I'm fine with setting material properties and boundary conditions, however my final question is how to make my fluid water (under boundary conditions)?? It has been defaulting to air (I believe) and I have been unable to change it to water. Do I need to specify my inlet condition mass fraction as 100% water? Or is there another way? Thanks in advance

A February 24, 2006 16:01

Re: Mass diffusion of surface exposed to water flo
 
1- define bc 2- fluid set then select water as your fluid, assuming you have copied water from Fluent Data base


Derek February 24, 2006 16:43

Re: Mass diffusion of surface exposed to water flo
 
When species transport is turned on, the option to pick the fluid type is not under 'fluid' in the bc menu. So I'm assuming there is another way to set the fluid as water?

A February 27, 2006 15:38

Re: Mass diffusion of surface exposed to water flo
 
data input panels depend on the models selected, the last time I solved a similar situation was months ago, I remember having to specify each component as spieces 1 or 2 ...and you define the concentrayion for each. Sorry if I am not of more help. Cheers and good luck


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