[soheil_r7]

Hi,

The goal of my current fluent work is to simulate the mixing of aqueous sucrose solution [viscousity of ~15.43 mPa.S] and ethanol [viscousity of ~1.1 mPa.S] inside a stirred tank. Water solution is already inside the tank to a specific height and ethanol must be "somehow" added to the system.

I have decided to use Euler-Lagrange multiphase flow approach [Discrete Phase Model in fluent] for this case, as it has the injection option for defining the injection point/location. It seems like DPM is the only choise for the purpose of this case.

I appreciate any advice, help and insight regarding this. Is this approach correct?

Thanks.

[LuckyTran]

Should also be doable with Eulerian VOF formulation or full Euler-Euler approach.

By "add" do you mean there is a drop of sugar that you want to see dissolve? Or do you want a steady stream? An initial drop is "added" in the solution initialization.

To do the initial drop, you can use the mark cells for refinement in a region (a sphere for example). This creates a cell register. Then you can patch those marked cells with the volume-fraction for the sucrose phase.

Yet an even more simple approach might not involve multiphase models, this doesn't feel like a multiphase problem to me. Use a species transport model.

[soheil_r7]

Thanks.

The issue is finding a way for that "initial drop" with a specified velocity, diameter, etc. I will try to learn doing it through cell register, according to your advice.

I think I was a bit vague in describing the overall objective of the case. The idea is simulating Antisolvent Crystallization, where another solvent (e.g. ethanol) is added to the existing solution (saturated water-sucrose mixture). Materials do not matter for now; it is just two liquids with different viscosities.

The main obstacles are: 1. Doing the injection/drop in fluent without changing the geometry (like to implement an inlet), AND 2. Selection of appropriate model (multiphase, like mixture model or maybe species transport).

As in the lab, we can assume a glass pipet that injects liquid into a tank with constant flowrate at different locations (attached picture).

Best Regards,
Soheil