Hatsopoulos Microfluids Laboratory

We proceed to examine the flow field in the case of the viscoelastic PAA-based test solutions. Figure 5 shows normalized velocity magnitude fields obtained in each of the three extensional flow configurations for the 100 ppm PAA solution over a range of imposed nominal extension rates. At lower nominal rates, such that Wi n o m is only slightly above unity, the flow field in each case [uniaxial, planar, and biaxial, shown in Figs.

Abstract The interplay between viscoelasticity and inertia in dilute polymer solutions at high deformation rates can result in inertioelastic instabilities. The nonlinear evolution of these instabilities generates a state of turbulence with significantly different spatiotemporal features compared to Newtonian turbulence, termed elastoinertial turbulence (EIT).

Abstract Shear thickening denotes the reversible increase in viscosity of a suspension of rigid particles under external shear. This ubiquitous phenomenon has been documented in a broad variety of multiphase particulate systems, while its microscopic origin has been successively attributed to hydrodynamic interactions and frictional contact between particles.