Learning Forum

[user deleted]

Hello

I am using the DPM model to simulate a  particles injection from a nozzle. The nozzle has a spray pattern in the form of a solid cone with a spray angle of 30°.

Can you please tell me how to set the spray angle and solid cone shape for the spray pattern?

Spraying is carried out through a nozzle with a diameter of 0.3 mm into a closed container. I set the inlet as a circle with a diameter of 0.3mm. But I don't have the slightest understanding of how to make the shape of a spray torch - a solid cone and the right angle of the cone. 
Attached a photo of the model below.
Thank you in advance for your help, this is part of my thesis, I'am absolutely beginner in Ansys

[user deleted]

[user deleted]

[Rob]

Please can you post the DPM injection panel? I want to see what you've set. 

[user deleted]

Hello Rob

 

Thank you for agreeing to help me

 

Attached below is a photo of the injection panel. I can't figure out how to set solid cone spraying. As I understand it, the speed in x,y,z allows you to set only one velocity vector, and not a set of vectors.

 

I will also add the information that I am modeling the spraying of solid microparticles from the inlet, a stream of CO2 also comes out of the inlet. I use Fluid Flow (Fluent). (perhaps in this software package it is impossible to set the shape of a solid particle spray torch and you need to use another package?)

[Rob]

OK, solid cone is a separate injection type: look under the "injection type" option. Remember injections don't need to be linked to surfaces. 

[user deleted]

Hello Rob

 

I am very grateful to you, your advice helped me. 

 

I was able to set the spray torch I needed for the particles. But I had a question how to make the gas flow out of the inlet also in the form of a solid cone. I attach my settings to the inlet panel (I have changed almost nothing from the standard ones). 

 

Thank you for your help

[Rob]

Do you want gas or DPM particles (bubbles)? For gas you'd need to use the Velocity Specification and set the components. 

[user deleted]

My model implies that solid particles and gas come out of the nozzle with a solid cone spray torch at the same time. The gas is a continuous phase, the particles are discrete.
In DPM (as I understand it) I set the speed and shape of the solid cone only for particles (a photo of the DPM panel with the parameters I selected is attached).
But, as I understand it, from the inlet with the parameters that I set, the gas flow does not come out in the form of a solid cone, but simply perpendicular to the plane (this is confirmed by the shape of the flow after I started the solver and got the results)

[Rob]

The fluid flow part would be a boundary, and you may use profiles/UDF/expressions to alter the direction. Look at the options next to Velocity Specification Method. Or you'll need to extend the domain a bit (very precise measurement) to let Fluent calculate the flow to give the cone. 

The DPM injection then handles the solid particles (in your example). 

[user deleted]

thank you very much, you helped me a lot, Rob

[Zain Khan]

as this thread is still open, i wonder why solid cone has no parcel option

[Rob]

I'm fairly sure that the number of parcel is set by the number of streams and stochastic tries unless some other models are on.