Orientation in Large-Amplitude Oscillatory Shear

Fourier decomposition of polymer orientation in large-amplitude oscillatory shear flow

In our previous work, we explored the dynamics of a dilute suspension of rigid dumbbells as a model for polymeric liquids in large-amplitude oscillatory shear flow, a flow experiment that has gained a significant following in recent years. We chose rigid dumbbells since these are the simplest molecular model to give higher harmonics in the components of the stress response. We derived the expre...

Strain-rate frequency superposition in large-amplitude oscillatory shear.

In a recent work, Wyss [Phys. Rev. Lett. 98, 238303 (2007)] have noted a property of "soft solids" under oscillatory shear, the so-called strain-rate frequency superposition. We extend this study to the case of soft solids under large-amplitude oscillatory shear (LAOS). We show results from LAOS studies in a monodisperse hydrogel suspension, an aqueous gel, and a biopolymer suspension and show ...

Numerical simulation of a drop undergoing large amplitude oscillatory shear

The study of drop deformation in a time-dependent flow has received less attention compared to elongational and shear flows (Rallison 1984; Stone 1994; Li et al. 2000). One class of time-dependent flow, which can be achieved experimentally and analyzed numerically is that of an initially spherical drop, which deforms in response to an applied oscillatory shear. Figure 1 shows a schematic of the...

Large amplitude oscillatory shear properties of human skin.

Skin is a complex multi-layered tissue, with highly non-linear viscoelastic and anisotropic properties. Thus far, a few studies have been performed to directly measure the mechanical properties of three distinguished individual skin layers; epidermis, dermis and hypodermis. These studies however, suffer from several disadvantages such as skin damage due to separation, and disruption of the comp...

Large amplitude oscillatory microrheology