Electrolyte rheological parameters

Flow of the liquid past the electrode is found in electrochemical cells where a liquid electrolyte is agitated with a stirrer or by pumping. The character of liquid flow near a solid wall depends on the flow velocity v, on the characteristic length L of the solid, and on the kinematic viscosity (which is the ratio of the usual rheological viscosity q and the liquid s density p). A convenient criterion is the dimensionless parameter Re = vLN, called the Reynolds number. The flow is laminar when this number is smaller than some critical value (which is about 10 for rough surfaces and about 10 for smooth surfaces) in this case the liquid moves in the form of layers parallel to the surface. At high Reynolds numbers (high flow velocities) the motion becomes turbulent and eddies develop at random in the flow. We shall only be concerned with laminar flow of the liquid. 

The increase in the apparent order parameter means that the packing of the surfactant molecules at the interface changes significantly with the addition of salt. The enhanced stability produced by electrolytes might be due to the dehydration of the hydrophilic part of the surfactant. The surfactant -surfactant interactions would increase and consequently the interfacial films become more rigid. Results of rheological studies as well as interfacial tension measurements agreed with these hypotheses. ... 

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