Elastic Liquids

Cavity flows of elastic liquids: Purely elastic instabilities

Experimental observations of a purely elastic flow instability occurring in the lid-driven cavity flow of two semi-dilute polymer solutions are reported and the effect of cavity aspect ratio on the dynamical structure of the unstable flow is quantitatively investigated. The spatial and temporal characteristics of the secondary flow are measured using flow visualization, laser Doppler velocimetr...

Elastic effects of liquids on surface physics

The contact between a liquid and an elastic solid generates a stress vector depending on the curvature tensor in each point of the separating surface. For nanometer values of the mean curvature and for suitable materials, the stress vector takes significant amplitude on the surface. Although the surface average action of the liquid on the solid is the hydrostatic pressure, the local strain gene...

Contraction Flows of Highly-Elastic Liquids : Experiment and Simulation

It is well known that highly elastic liquids can exhibit flow characteristics which are markedly different from those found in Newtonian liquids. Nowhere is this better seen than in the case of Contraction Flows, whether axisymmetric or planar. Figure 1 shows the phenomenon of ‘vortex enhancement’, where the corner vortex (which is present in Newtonian liquids) is increased in size, often in an...

Elastic Sponges: Hydrophilic Sponges for Leaf‐Inspired Continuous Pumping of Liquids (Adv. Sci. 6/2017)

Deformation of Glass-Forming Metallic Liquids: Configurational Changes and Their Relation to Elastic Softening

5.1 Abstract The change in the configurational enthalpy of metallic-glass-forming liquids induced by mechanical deformation and its effect on elastic softening is assessed. The acoustically measured shear modulus is found to decrease with increasing configurational enthalpy by a dependence similar to one obtained by softening via thermal annealing. This establishes that elastic softening is gov...