Hello everybody.
I am quite new to UE 4 develpoment.
My question is:
I want to do an interactive simulation of smoke in a pipe.
Is it possible to send soke particles through a pipe(es)?
Smoke should come from the on side in and to the other side out.
The whole pipe should be filled with smoke after a while after particles start.
Didn’t find any solutions that match after googleing the problem.
Do i have to do it with splines (if possible) or is there a collision system to use?
Or is it possible to use sprites following a path?
Looking forward to your answers.
You could use the particle collision, but depending on the shape of your pipe (many turnings,…) there might be an easier solution 
Many thanks for the reply .
Ideed there are some turnings the particles have to deal with.
What would be the easier solution?
Just add a spline to your pipe and then add single smoke particle modules -> probably not the most efficent way, but you will get a good result
Otherwise it could probably also work when you do it with vector fields -> https://docs.unrealengine/latest/INT/Engine/Rendering/ParticleSystems/VectorFields/index.html (havent tested it)