A THERMODYNAMIC BASIS FOR TRANSPORT PHENOMENA IN VISCOELASTIC FLUIDS

Abstract

A calculation for the longitudinal stress modulus in a viscoelastic medium is obtained introducing the stress tensor, its trace and the heat flux as additional variables, without requiring the specific form of the dynamic structure factor of the system. By using extended irreversible thermodynamics, we derive the time evolution equations for the state variables. These equations are used to obtain general wave vector and frequency dependent expressions for measurable properties of the system. We recover for a particular case results that have been derived previously in the literature.