Ranges of frequency dispersion for the shear viscosity coefficients of aqueous solutions of electrolytes

The range of frequency dispersion for dynamic coefficient of shear viscosity eta (S) (omega) of electrolyte solutions obtained through kinetic equations under the condition of recovering the steady-state structure of a liquid exponentially or according to the diffusion law is considered. Numerical calculations of eta (S) (omega) are performed for an aqueous solution of NaCl depending on density rho, temperature T, concentration C, and frequencies omega to select the potential of intermolecular interaction I broken vertical bar (ab) (|r|) and equilibrium radial distribution function g (ab) (|r|). It is noted that the calculated theoretical results of eta (S) (omega) are in quantitative accordance with the experimental data. It is shown that the range of frequency dispersion eta (S) (omega) based on the diffusion mechanism is broad (similar to 10(5) Hz) and is narrow in the case of exponential attenuation of the viscous stress tensor (similar to 10(2) Hz); this corresponds to both acoustic measurements and results from phenomenological theory.