Phenomenological characterization of the rheological behaviour of inelastic reversible thixotropic and antithixotropic fluids

Abstract

The constitutive equations for inelastic thixotropic fluids proposed by Moore and Hahn et al. and for antithixotropic fluids by Peter are generalized into an equation of state F = η(λ, D)D and a rate equation dλ/dt = gD(λ, D) for both thixotropic and antithixotropic fluids. The properties of these equations and restrictions on their functional forms are discussed. It is shown that thixotropy and antithixotropy can be defined by whether (∂gD/∂D)λ and (dλ/dD)e are negative or positive.