Abstract
A coaxial cylinder viscometer has been used to determine the rheological properties of water-based hydraulic fluids. The work includes also an analysis of the viscometer. The power law τ = K /γ ̇ n has been used as a rheological model for non-newtonian fluids, where τ is the shear stress and γ the corresponding shear rate. The parameters K and n are assumed to depend on the pressure and temperature. Four types of fluids have been examined. Non-newtonian behaviour has been established for fluids containing polymeric viscosity improvers. These non-newtonian effects are less pronounced at high temperatures. The viscosity increase with pressure is much lower for water-based fluids than for mineral oils.
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