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Relative Permittivity has no effect?
Posted 2012年3月13日 GMT-4 22:13 3 Replies
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How come I see no change in the electric field when changing the relative permittivity of the material between and surrounding the parallel plate capacitor in the attached example?
Thanks
Thanks
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3 Replies Last Post 2012年3月14日 GMT-4 14:28
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Posted:
1 decade ago
Hi
because the electrioc field will not change, the capacitance yes (and it does, try to give er=1000 and solve and integrate your capacity variable
You need to add a second material in between the electrodes and change one of the two Er to see any true change in electric fields
--
Good luck
Ivar
because the electrioc field will not change, the capacitance yes (and it does, try to give er=1000 and solve and integrate your capacity variable
You need to add a second material in between the electrodes and change one of the two Er to see any true change in electric fields
--
Good luck
Ivar
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Posted:
1 decade ago
So are you saying that Comsol isn't giving me the Eeffective = E-Epolarization but only E, where Epolarization is due to the dielectric?
Thanks
Thanks
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Posted:
1 decade ago
Hi
you are right, I was a bit too quick, there I you look at "V" the way you have made your model. There you will not see any rainbow color change for V with er=1 or er = 1000 for the air.
But if you look at D or E (vector components), you will notice a difference in your model by changing the er of air, there we agree and COMSOL is calculating correctly ;)
If you add a domain in part of the air gap height and change the "er" of this domain, then you will also notice the change in the V value in the gap
--
Good luck
Ivar
you are right, I was a bit too quick, there I you look at "V" the way you have made your model. There you will not see any rainbow color change for V with er=1 or er = 1000 for the air.
But if you look at D or E (vector components), you will notice a difference in your model by changing the er of air, there we agree and COMSOL is calculating correctly ;)
If you add a domain in part of the air gap height and change the "er" of this domain, then you will also notice the change in the V value in the gap
--
Good luck
Ivar