Conductivity and Transfer Coefficient

The conductivity of an electrolyte is determined by the concentration c and charge z of the dissolved anions and cations and their mobility. The specific conductivity k is the conductivity of an electrolyte volume of unit length I and unit surface area A I = 1 cm. 

Another useful quantity is the transfer coefficient given by Equation 1.17 for simple electrolytes with the same value for c,z, for cations and anions. 

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The calculation of drying processes requires a knowledge of a number of characteristics of drying techniques, such as the characteristics of the material, the coefficients of conductivity and transfer, and the characteristics of shrinkage. In most cases these characteristics cannot be calculated by analysis, and it is emphasized in the description of mathematical models of the physical process that the so-called global conductivity and transfer coefficients, which reflect the total effect on the partial processes, must frequently be interpreted as experimental characteristics. Consequently, these characteristics can be determined only by adequate experiments. With experimental data it is possible to apply analytical or numerical solutions of simultaneous heat and mass transfer to practical calculations. 

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