Thermal Convection and Streaming Phenomena

As stated above, the layer containing the temperature profile seems to possess a complex substructure. If, at a permanently heated wire electrode, a voltammetric experiment is performed, then, as mentioned above, a constant limiting current is found. It seems that inside the region with T Tq exists a stagnant layer, although just at places nearest to the electrode surface should act the strongest forces to cause 

5 Dynamic Processes in Cells with Heated Electrode-Solution Interfaces 

Already the form of voltammograms with peak shape shows that there must by some kind of a stagnant layer. More detailed information has been achieved by 

As soon as the growing diffusion layer is reaching a critical value with decreasing scan rate, it will no longer be small compared to the wire radius. It cannot be considered to be planar, but from this moment it will change more and more to a curved, i.e. cylindric, character. Start of cylindric diffusion can be detected by analysing the value of the apparent diffusion coefficient )obt=/(log v). If the classic equation (5.5) will dehver an exotic value of )obt far from reality, obviously cylindric diffusion is predominant. For cylindric diffusion, a modified form of the Randles-Sevcik equation has been derived [7]  

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