Laws high field equation

Thus, an electrolytic conductor obeys Ohm s law for all except very high fields and, under steady-state conditions, it can be represented in an electrical circuit (in which there is only a dc somce) by a resistor. (An analogue must obey the same equation as the system it represents or simulates.)... 

Mathematically, this model is identical to the previous one and the growth rate is given by equation (8.22), where AG iis to be replaced by AG 2,ch- We conclude that the same type of growth law is predicted regardless of whether high field conduction in the film or interfacial charge transfer is rate controlling. 

In other cases, researchers assume that the inertial resistance to flow in DLs adjacent to conventional flow fields is negligible and they tend to lump both viscous and inertial coefficients together. This may not be a correct assumption, especially when dealing with flow fields like the interdigitated design [129,212], in which higher velocities are experienced in the pores of the DL. The Forchheimer equation is an extension of Darcy s law and takes into account the inertial resistance at high velocities [211,213] ... 

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