Learning Forum

[p.wilk]

Hello guys, 

I am supposed to simulate a tool electrode that is oscillating up and down with 300Hz and Amplitude of 15µm (ish). Appearently the particles are supposed to be pumped out of the channel/cavity (see picture).
From a theoretical view it doesn't make sense to me because stokes-number St<<1. The width of the gap between the moving electrode and wall is 50-100µm and particles are 1-20µm. Can anyone try to explain why it might still be possible or what I am simulating wrong? My particles only move slightly up and down and settle after a specific time but there is no "net-pumping" out of the gap. 



Kind regards,
Philip

[Rob]

No idea if you're doing it wrong as all I can see is the image. Assuming you're not using DPM (read up on what it does) particle motion will depend on whether the gaps are constant and whether there are any weird fluid effects in the experiment. 

However, as staff are very limited in what level of expertise/experience we can demonstrate regarding the weird fluid effects I'll leave this for the wider community.