Impingement rate and particle density

General discussion
1

1

Hi,
I would like to know the meaning of “1” in the Impingement rate and particle density in the figure. Does the “1” mean the number of particles if I understand correctly?

Best,
Lee

2

Exactly, in both cases 1 is particles.
Imp.rate: particle_hits/second/m2
Density: particles/m3

3

Just to confirm I am interpreting this right. I am using the formula editor to track impinging rate on a facet (formula Z100). This should give the particle_hits/sec/m^2, so to estimate the total number of particles that hit the facet each second I need to multiply by the area of the facet. However, I’m assuming the area of a facet is calculated in units of cm^2 when using the formula editor. So to get the particle_hits/sec the formula should look like this:

Z100*(AR100/1e4)

I realize this is a basic question, but the units of imp. rate and area are not explicitly listed in the formula editor syntax guide, so I would just like to confirm this is correct.

4

Hi Joey

Yes, that is correct!
The units of impingement rate and area are the same in the formula editor as elsewhere (hits/sec/m^2 for impingement, cm^2 for area). The same goes for other formula variables as well.