BROWN HIGH VISCOSITY LIQUIDS EXAMPLES MOVIE
BROWN HIGH VISCOSITY LIQUIDS EXAMPLES FREE

Although many studies investigated the capillary thinning of viscoelastic, shear-thinning surfactant solutions 4, 5, 6, 7, 8, only two examined the uniaxial flow behavior of inelastic, shear-thickening surfactant solutions 9, 10. Filaments with length greater than 10 cm can be created and it should be emphasized that this is not due to a viscoelastic response of the solution, which is responsible for filament formation in highly concentrated surfactant or polymer solutions.

BROWN HIGH VISCOSITY LIQUIDS EXAMPLES MOVIE

This solution forms remarkably long filaments when (a) a fluid drop drips from a nozzle, and when (b) pulling a rod out of a fluid reservoir (see Supplementary Information Movie S1). 1, for very dilute surfactant solutions with a low shear viscosity close to water and no measurable viscoelasticity (see Supplementary Information Figure S1). However, in this study we report a surprising phenomenon, as shown in Fig. On the other hand, low viscosity inelastic fluids such as water do not form long living filaments - instead the fluid thread quickly breaks. During uniaxial extension, polymer solutions and other viscoelastic fluids exhibit slow thinning processes and prolonged filament lifetimes up to several seconds, due to stretching of polymer chains and growth of extensional stresses inside the filament.

Experimental techniques, such as the capillary breakup elongational rheometer (CaBER), are commonly used to study fluid response to elongational deformations.

BROWN HIGH VISCOSITY LIQUIDS EXAMPLES FREE

The progressive thinning of free complex fluid filaments in uniaxial extension is driven by capillarity and resisted by inertia as well as viscous and elastic stresses inside the filament. The breakup of fluid threads is a dynamical process, omnipresent in nature and highly relevant for many technological operations such as atomization and spraying 1, electrospinning 2, or roll-coating 3. This simple experiment shows how complex fluids like saliva, which contains naturally occurring polymers that cause viscoelasticity, respond to stretching or elongational deformation. This filament starts to thin, eventually forming a periodic pattern of small beads connected by small threads, before it finally breaks.

When you put a drop of saliva between your thumb and index finger, then slowly pull your fingers apart, a slender fluid thread forms.

Brown high viscosity liquids examples