[Shomaz ul Haq]

Dear all. Hi. Hope all are well. I am using a particle transport model for multiphase nanofluid heat transfer study. I wanted to ask on what basis should I choose the number of particles and mass flow rate? Should I use the mass flow rate of base fluid?

Also it says in CFX doc "You can introduce particles into the domain by enabling the Define Particle Behavior toggle on the Fluid Values form and specifying their properties on an inflow or opening boundary. This is used when you have more than one inlet, but particles only enter through some of them."
Does this mean I cannot use this for a single pipe which has only one inlet?

Would be grateful for help. Thank you.

[Cloudseeker]

Hi,

Your massflow rate should be given by your case. What mass flow do you have in reality. 5 gramm per kg water or something like that. The numer depends also on your case. Are you using one- or two-way coupling? If your paricle loading is low enough, so that there is no influence of the particles on the fluid you can use one-way, otherwise two-way. Two-ways needs much more time sice it needs to calculate the particles every few iterations of the fluid. In both cases you should try different numbers of Particles and see when there are no longer changes in the results.
You can define the injection of the particles either in the domain under the "particle injection regions" tab or under the inlets. If your particles enter the domain via the Inlets, that option is easier to use.

hope that helps you
Cloudseeker

[Shomaz ul Haq]

Hi Cloudseeker. Thanks a lot for your advice. I will follow that and let's hope I arrive at a value at which results don't change. Really grateful.