Fluids with microstretch

Summary In this paper fluids with stretch are introduced as a subclass of simple microfluids. In these fluids the local fluid elements are allowed to undergo only a uniform stretch, or contraction without microrotation. These fluids might find applications especially inNewtonian fluids with bar-like polymeric additives. The field equations are obtained, initial and boundary conditions discussed and the thermodynamics of such fluids is studied. The solution of the problem ofPoiseuille flow between two parallel plates is given. Microstretch fluids with constrained microrotation are also discussed briefly as another subclass of simple microfluids.