thermodynamic flux Thermomechanical orthogonality in nonlinear type-III thermoelasticity (GNIII) Authors: Kovalev V. A., Radaev Y. N. The present paper is devoted to formulations of constitutive equations for the non-linear Green–Naghdi type-III thermoelastic continuum consistent with the principle of thermodynamic (or thermomechanical) orthogonality. Read more about Thermomechanical orthogonality in nonlinear type-III thermoelasticity (GNIII)