Initially you have a high volume fraction of droplets near the injectors. These will hopefully evaporate very quickly. But, if you add droplets in at very close proximity that are travelling in about the same direction & speed with collision on they're going to agglomerate. Then the next droplet hits etc. Very quickly the region around the injector is droplet and you may or may not evaporate faster than liquid is added.Â
Hence increasing the injection interval.Â
Normal droplets on a wall will become trapped by the viscous sublayer. Wall films are designed to work with the wall shear and move.Â
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Most multiphase models are fairly easy to set up. The really hard part is understanding the likely flow field and physics to decide what to set up.Â
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