For the velocity, we find for a velocity inlet of 1.8 m/s so Re=3000 this profil
We see that there is a recirculation zone near the transversal walls
and the velocity is nulle in the bottom
The following section is the interesting one: we will put particles in our flow and we will try to follow them.
After having the results of our simulation, StarCD permits us to make particle tracking quite easily . First of all, we choose the place where we will inject the particles:
- the initial positions of the particles -
Now, we are able to choose the different characteristics of our particles,
and to let them go in the flow!
We will make different tries for different diameters and different densities.
D=0 , rho=0
If we set all characteristics of the particles to 0, what we get is the stream lines. Given that it is interesting, here they are.
Apparently, we obtain the same results. It is the same result because
we plot a continuous track but if we plot a segment track ( option in Particle
tracks, plot tracks), this give us an animation of the particles and we
that the particles have not the same velocity when we change their diameter.
Things began more interesting for the next settings
Some particles fall down , but what is strange is that the particle
near the transition zone didn't fall down.
with a segment plot of the tracks, we see that this particle has the more less velocity .
Once the particles higher began to fall, the inertie force became more strong and the fall is unelectable
if we increase the diameter
-D=6*10-4m, rho=2000kg/m3 , we obtain
The Precipitator is more efficient imn this case
In my first analysis, the velocity inlet seems to be a little high comparatively
to the dimensions of my precipitator, so i decided to decrease it to m/s
and to start a new analysis
the velocity profile is
we obtain, apparently, the same result
The same remarque is applicable here
For D=10-5m, rho=2000kg/m3, we obtain this result
So, the precipitator became more efficient.
It will be more and more efficient if we decrease the velocity but the problem is that our flow will become not turbulent so the principle of this precipitator will be not applied