On the development of fluid models of the differential type within a new thermodynamic framework

We assess the status of a fluid of grade two within the context of a new thermodynamic framework that has been put into place that appeals to the maximization of the rate of entropy production for making a choice of constitutive equations from an admissible set. Unlike fluid of the rate type like the Maxwell fluid, the Oldroyd-B fluid or Burgers’ fluid, we see that certain modifications need to be made if we have to accommodate differential type fluids such as fluids of grade two.