DPM - solid particle modelling
In de-dusting process
Modeling multiphase flows often requires the consideration of particulate matter - especially in industrial applications. The Discrete Phase Model (DPM) is a convenient tool for calculating the trajectory of particles (but also of liquid droplets) with a relatively small fraction in the volume of a fluid. The animation below shows the trajectories of solid particles <5 μm in the cyclone. These trajectories are chaotic, filling practically the entire available volume inside the de-duster. As you look closely, some of the particles are entrained by the gas and leave the cyclone through the central exit.
![](http://galaxy.agh.edu.pl/~zmok/wp-content/uploads/2021/09/cyklon_exp_d3_9.gif)
Much heavier particles, with the same density but about 100 μm in diameter, behave completely differently - their trajectories are ordered, creating a characteristic spiral near the walls of the dust collector. In the lower (conical) part, you can see how the wall angle affects the falling speed of the particles.
![](http://galaxy.agh.edu.pl/~zmok/wp-content/uploads/2021/09/cyklon_exp_d100.gif)