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By Arefeva I.Ya.

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Functional instrumentation equipment are provided for measuring the ac features of enormous, prolonged or interconnected grounding structures. Measurements of impedance to distant earth, step and contact potentials, and present distributions are coated for grounding platforms ranging in complexity from small grids (less than 900 m2), with just a couple of hooked up overhead or direct burial naked concentric neutrals, to massive grids (greater than 20 000 m2), with many hooked up neutrals, overhead floor wires (sky wires), counterpoises, grid tie conductors, cable shields, and metal pipes.

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In order to analyze the influence of the big concentration difference on the interphase mass transfer rate it is necessary to use [44] its dimensionless form: Ac, = M | C I O " 5 C 2 0 ' = ( - i) m sAm (<%, = 03 < o , en = en > o ) . 5. Comparison of the results from the asymptotic and numerical solutions. 90) accounts for the convective mass transfer as a result of a secondary flow induction. This effect is significant at high concentrations at the phase interface QfC2o) in case of desorption.

Having all this in mind, it is interesting to compare the mass transfer rate at the same i concentration gradients and different mass transfer directions. 25), if it is assumed that 0 = 0 and p* / p*0 = 1. 25), when 0 > 0. 25) for c* = 0, when 0 = 0 and p* / p*0 = 1 . The influence of the concentration gradient and the direction of the mass transfer on its rate, as well as the separate effects of the non-linear mass transfer for UQ = 1 m/s, L = 0,1m, D = 2,19 . 10"5 m2/s, 6 = 1, are illustrated on Fig.

At small values of Ac\ in absorption or desorption, when Zc20 = 0, this effect could be neglected. e. on the change of 0 3 . The above considerations indicate that the influence of the big concentration difference is diverse and it is of interest to compare the interphase mass transfer rates at constant value of concentration difference Ac\ and different directions of the mass transfer. 91). 3 AC Fig. 13. 61) for values 03 < 0. In the absorption cases (# 3 > 0) and %C2a = 0 , so p\ I p[Q = 1 has to be substituted in the equation for the interphase mass transfer rate.

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