ANALYTICAL METHOD FOR ESTIMATING
THE NONLINEAR PROPERTIES OF LIQUIDS
BY A TORSION VISCOSIMETER

I. V. Elyukhina and G. P. Vyatkin

UDC 532.137.3

This paper considers the motion of a torsion viscosimeter 
that permits a conclusion about the rheological type of the liquid 
filling it. We have developed a theory of identification of nonlinear 
properties based on the use of the effective values of viscosity for 
each half-period and analytical solutions for linear liquids. The 
questions of the sensitivity that should be taken into account in 
planning an optimal experiment have been highlighted.

South-Ural State University, 76 V. I. Lenin Ave., Chelyabinsk, 454080, Russia; 
email: susu@74.ru. Translated from Inzhenerno-Fizicheskii Zhurnal, 
Vol. 81, No. 3, pp. 518-523, May-June, 2008. Original article submitted 
December 7, 2006.