ALLOWANCE FOR METHODOLOGICAL ERROR IN THE DETERMINATION OF THE RHEOLOGICAL CHARACTERISTICS OF NON-NEWTONIAN FLUIDS

A method is proposed to approximate flow diagrams with allowance for t he methodological error due to the non-Newtonian properties of the tes t fluid. The equations of motion for Couette and Poiseuille flow are e xamined on the basis of the Shulman model, which describes non-Newtoni an fluids which do and do not have plastic properties. It is shown tha t even for fluids of the given type with pronounced non-Newtonian prop erties, the methodological error can be ignored if the gaps in the vis cometers are small.