Question about joule heating (multi terminal)
Question about joule heating (multi terminal)
(OP)
Hello all,
I would like to heat a surface using Joule heating principle. The picture is shown in attachment. The top surface of the glass body is coated with ITO and silver beads to connect it with electric source. With my arrangement is it possible to independently control the heat flux at each section between the two opposite poles.
Thank you.
I would like to heat a surface using Joule heating principle. The picture is shown in attachment. The top surface of the glass body is coated with ITO and silver beads to connect it with electric source. With my arrangement is it possible to independently control the heat flux at each section between the two opposite poles.
Thank you.





RE: Question about joule heating (multi terminal)
The main question is what kind of uniformity is required, because your architecture will lead to circumferential nonuniformity in temperature.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
The idea is since on top of surface there is a convective heat transfer, I might need less heat flux at the downstream. So that I can have uniform temperature along the flat surface (longitudinal).
RE: Question about joule heating (multi terminal)
I really don't know if I'm looking a box, a sheet, or a tube.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
RE: Question about joule heating (multi terminal)
Even if yes, there will be a nonuniformity along the sides and ends, because of the asymmetry of current and heat flow along the open edges. What uniformity are you trying to achieve?
Your ITO surface is the only part that's getting direct heating. That means that everywhere else in your system will be cooler, and the farther away from that surface, the cooler it will get.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
RE: Question about joule heating (multi terminal)
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
The other thing is what do you mean by splitting the ITO along the long dimension?
A sketch would be helpful.
Thanks.
RE: Question about joule heating (multi terminal)
where there are 5 heaters, 4 for the edges and 1 for the middle.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
Is there any simple calculation to prove that the arrangement will ensure a uniform temperature?? So basically based on your sketch, there will be two positive and two negative poles, right?
What do you think with this top arrangement (see attachment)? Will it gives the same effect as your sketch?
RE: Question about joule heating (multi terminal)
In my drawing there are 5 separate heaters, and the ones that are symmetrically placed might be paralleled, but that's about it. If you want uniformity, don't skimp on the control circuitry.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
RE: Question about joule heating (multi terminal)
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
And what do you like think would be the best for the control circuit? Where should I start?
RE: Question about joule heating (multi terminal)
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)
So i have divided the plate into 5 zones, each zone has two electrodes (positive and negatives). Each zone has independent source of electricity, right?
When you said center strip, do you mean the part shown by arrow with A? I do not quite understand about your explanation. I would like to have a smooth surface since on top of it there is a fluid flow.
RE: Question about joule heating (multi terminal)
Going to send a bill for your work soon?
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Question about joule heating (multi terminal)
S, no just slumming
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Question about joule heating (multi terminal)