Heating, current ohmic

In tokamaks during the ramp-up phase, the plasma current ohmic heating power heats the plasma to 0.1-1 keV temperature. The value of the toroidal plasma current is set by the magnetic configuration, therefore the ohmic heating power is determined by the plasma resistance R. Unfortunately R oc and thus with increasing electron temperature the... 

Electric heating (ohmic or Joule heating) of the electrode body by an imposed heating current (direct electric heating)... 

J], T, absolute temperature [K], AS, reaction entropy [J K ]) is converted into heat and has to be dissipated from the cell. Substantially, it is the consequence of the overvoltages (see Sect. 2.3.2.1), the part that is caused by ohmic voltage drops is the Joule heat . Small cells usually need a heating for applications at elevated temperature, but for larger cells and high cell currents a sufficient heat dissipation is required. 

Ohmic resistance - the ionic and electronic currents, when passing through the electrodes, generate the so-called Joule heating. 

Inside the porous regions the temperature is assumed to be the same in gas and solid regions (local equilibrium). The source term includes ohmic heating, which is distributed throughout the current conducting regions and heat produced due to the... 

As already mentioned, the induced current Ipl heats the plasma due to joule losses which are proportional to the plasma resistance. With increasing temperature the plasma resistance decreases and the ohmic heating becomes less effective. Theoretical analysis shows that the maximum temperature which can be reached in this way is below 2 keV, i.e. the plasma cannot enter the ignition region of 5 keV4. Therefore,... 

A fifth reason for using microfluidics in electrochemistry would be the possibility to combine flow chemistry with an ultrafast mixer, which allows the generation and subsequent use of short-lived reactive ions or radicals, for example, in a "cation flow" process (Suga et al., 2001 Yoshida, 2008). Finally, a sixth reason for performing electrochemistry in a microfluidic system may be the desire to efficiently remove reaction heat (or joule heat due to high currents in combination with a high ohmic resistance) in fast electrochemical reactions (Yoshida, 2008). 

The most familiar thermoelectric effect is the generation of Ohmic heat due to current flow, discussed in Section 12.3.2. Less well known is the Thomson heat, produced or absorbed when a current flows in a temperature gradient. The Thomson coefficient, a, can be defined as... 

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