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While reading about dielectric heating on Wikipedia, I read about the ion drag mechanism but there wasn't enough information about.

I know there is another Phys.SE question talking about the ion drag in heating but the answer isn't explaining the mechanism.

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2 Answers 2

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The ion-drag mechanism refers to heat generation whose microscopic origin is the momentum transfer in collisions, between a flux of charged particles [ions] and other charged species, induced by the Coulomb force.

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  • $\begingroup$ What does it have to do with dielectric heating and microwaves? $\endgroup$
    – Abdelrahman Esmat
    Commented Nov 4, 2012 at 19:46
  • $\begingroup$ Inelastic collisions between particles produce kinetic energy losses that turn into vibrational energy of the particles [heat]. The microwaves are simply time-dependent electric fields which produce the Coulomb drag. $\endgroup$
    – Dani
    Commented Nov 4, 2012 at 21:56
  • $\begingroup$ Why then ions are dragged slowly ? $\endgroup$
    – Abdelrahman Esmat
    Commented Nov 5, 2012 at 6:15
  • $\begingroup$ Because the EM frequency is low. If the EM frequency is too high the ions oscillate so quickly that there is no displacement but vibration. $\endgroup$
    – Dani
    Commented Nov 5, 2012 at 20:14
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Ion drag is associated with low frequency (RF) EM waveforms, and is what causes resistive heating, not dielectric heating. Dielectric heating (e.g. microwaves) relies on dipole rotation.

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