“…The viscosity of non-newtonian solutions can be calculated by means of a continuum mechanistic approach [1,2], as for example, through the Rivlin-Sawyers theory [2,3] and concepts such as Finger tensor [4] and Cauchy-Green tensor [5], leading to equations such as the Oldroyd-B and the (Kaye)-Bernstein, Kearsley, Zapas -(K)-BKZ [6][7][8]. However, as the description of these models are very rigorous, they frequently contain a large number of parameters which are difficult or, in some cases, impossible to be determined by fitting the experimental viscosity data [9,10].…”