Hi
I'm trying to take a look at a needle full of liquid that has a high voltage electric current applied to it. The steel needle is enclosed in a steel bulkhead, which is at a high voltage, and is a few millimeters from a grounded electrode.
I've tried simulating this in COMSOL, but I'm confused by a few things. I was expecting to see the entire needle have a high electric potential, since its a conductive metal. But for some reason the needle doesn't seem to have an effect on the electric potential. Also, if I change the needle material to an insulating material it doesn't have an effect on the field shape, which seems counterintuitive to me. Is there a reason for this? And if so, is there a better way to visualise the effect that the material will have on the electic field?
Apologies if this is an bvious question, I'm new to software such as this. I've attached the file I'm talking about, in case I'm not explaining it well.