Structural Viscosity

Structural Viscosity


the viscosity related to the appearance of a structure in a liquid and dependent on the gradient of the flow rate. Structural viscosity is typical of disperse systems, including colloidal solutions, and solutions of high polymers. Structural viscosity arises in these systems because in the flow of a structuralized liquid the work done by external forces is expended not only in overcoming true (Newtonian) viscosity but also in destroying the structure and reorienting the elongated particles in the flow. Structural viscosity plays a large role in transferring disperse systems, for example, slurries when dredging river channels, and liquid polymers through pipes and in the flow of these substances through the apparatus used in the chemical industry. The term “structural viscosity” was introduced in 1925 by the German scientist W. Ostwald.


Reiner, M. Reologiia. Moscow, 1965. (Translated from English.) Uspekhi reologii polimerov. Edited by G. V. Vinogradov. Moscow, 1970.


References in periodicals archive ?
The long-range intermolecular interaction can be quantitatively described by structural viscosity [DELTA][eta] as shown below [22, 23].
According to the rheological concept--study of deformation and flow of various substances-structural-mechanical properties of ointment preparations include plasticity, structural viscosity and thixotropy.
Just like many aqueous paint systems, the product exhibits a high structural viscosity and requires thorough stirring (avoid foaming) prior to application.
Several approaches can model the structural viscosity or pseudoplastic manner of polymers under the influence of shear rate and temperature.