Learning Forum

[AhmedCfx]

Hi all

I’d like to ask you, how to simulate dissolved salt in water and check the density and viscosity for different temperatures?

Best regards

[Rob]

If it's already dissolved and there is no change in concentration within the domain you supply the density & viscosity.  If you're mixing two fluids then you define the values for each fluid and set a mixture where the mixture will take account of the two (or more) fluids. 

Note, properties can be a function of temperature. If it boils you'll need additional models too. 

[AhmedCfx]

Dear rwoolhou
I need to change the concentration of salt several times and check the density and viscosity of the mixture. I need to make it miscible process .

[Rob]

You're dissolving more salt?  The solver uses user supplied materials data to determine density & viscosity so you will need to explain exactly what you want to show and find out before we can advise. 

[AhmedCfx]

Dear rwoolhou

in Hysys software you can mix salt and water in room temperature to get a new solution and you add different volume fraction of salt and each time calculates the density and viscosity of the solution, my question is , does Ansys has the same ability ? I think it is something chemical instead of CFD.

[Rob]

Hysys probably has a built in materials model to handle that. In CFD codes we can model this sort of application (rather than assuming mixing rates & efficiencies) but you'd need to input those material properties yourself. 

Aspen & CFD have different uses. I'd use the former to design a chemical process plant and CFD to optimise the individual pieces of equipment.