Here you can define the conditions for the creation of foam particles based on various threshold parameters.
...
With “Yes” the splashes will be created from the Hybrido core fluid particles. The associated thresholds are used to control the areas of foam emission. Please read the following page to learn how to do preview these areas of emission: → “Splash and Foam Previews”.
Emission rate
This is the number of particles which are created per second per cubic metre. The final number of particles also depends on the various threshold values and the used particle type. In some cases it can be necessary to use very high settings of 1,000,000 and more.
...