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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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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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What does it have to do with dielectric heating and microwaves? – Abdelrahman Esmat Nov 4 '12 at 19:46
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. – DaniH Nov 4 '12 at 21:56
Why then ions are dragged slowly ? – Abdelrahman Esmat Nov 5 '12 at 6:15
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. – DaniH Nov 5 '12 at 20:14

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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