August 1, 2019 at 6:59 amChris1opherSubscriber
I am modeling a mixture in a closed reactor so that the volume can not change. As mass conservation applies, the density can not change.
It is not possible to choose [constant] as the density property of my mixture, when I define the physical properties of the mixture. As a workaround, I could use a mixing law and use the same density for each pure component. I wonder if there is a reason that I cannot choose [constant] as the density property for my mixture.
August 5, 2019 at 2:17 pmRobAnsys Employee
If you're in Fluent check the density for each/all of the materials - are any variable? I'm pretty sure you can set a constant for a mixture density.
August 5, 2019 at 2:36 pm
August 5, 2019 at 3:29 pmRobAnsys Employee
And what are the densities of the various mixture materials?
August 5, 2019 at 3:35 pmChris1opherSubscriber
I want my mixture to have always the same density no matter of the composition.
The density is 1042 kg/m^3
When I'm specifying the viscosity of the mixture as constant I'm no longer able to edit the viscosity of the pure materials. I was expecting that the same thing works for the density.
August 6, 2019 at 11:12 amvinitraj3Subscriber
For that you need to define the density of each component of mixture as 1042 kg/m^3. Then in the mixture panel you can specify the density as volume weighted mixing law. It will always return 1042 as the density of mixture
August 6, 2019 at 12:19 pmChris1opherSubscriber
Do you know why there is no possibility to set the density of the mixsture as constant like it is possible for other proberties?
August 6, 2019 at 12:46 pmRobAnsys Employee
There's probably some maths that needs a mixture value. Normally we'd use ideal gas for a sealed system where heat was expected otherwise you'll miss any buoyancy effects.
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