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Fluid fractures like a solid

U. NOTTINGHAM (UK) — Stretch it slowly, it flows like liquid. Add some speed, it fractures like a solid. This newly observed behavior in a type of “complex fluid” suggests new physics.

The discovery—reported in the Nature Communications—could be useful to the manufacturing industry because the processing and dispensing of everyday products like toothpaste, cosmetics, pharmaceuticals, and foodstuffs depends on understanding the physical properties and behaviors of these concentrated solutions.

Previous research has tried to measure flow properties by pressing the fluid between two circular rotating plates, called a “shear rheometer,” but this has limited applications relating to industrial manufacturing processes.

The new experiments tested various complex fluids in a different way using an “extensional rheometer.” Instead of squashing the substance, this device stretches it out between two plates at varying speeds to measure the flow properties.

“Our observation of the fluid with a high speed camera revealed some intriguing effects depending on the concentration of particles and the speed at which the plates were moved,” says Michael Smith, a physics professor at the University of Nottingham. “At low velocities the fluid is observed to behave like a liquid but at higher velocities and concentrations of particles the fluid can actually fracture like a solid.

“This happens if you dissolve a large amount of cornflour in some water, for example. The high concentration of tiny particles inside the fluid jam into one another forming clusters which lock solid if disturbed at a high enough speed.

“It is a bit like trying to move through a street crowded with an enormous number of people. If you move slowly enough you can make progress and the crowd and you ‘flow.’ However, if you try and sprint down the street you will just knock into so many people that you’ll never be able to move at the speed you want to and hence everything becomes grid locked””

The research shows that while many features of this kind of system were independent of the geometry of the flow examined, some effects due to the exposed fluid surface were much more important than had previously been thought. In particular an effect known as “dilatancy” in which some of the particles poke through the surface of the liquid was found to play a crucial role in the jamming of the particles.

“The most incredible results were observed when the fluid was stretched at a velocity just below that required to form a jammed fluid,” says Smith. “The fluid was found to form a thin filament which narrowed until it was about hundred particles in diameter. At this point the fluid was observed to recoil elastically, like a rubber band!

“This is particularly fascinating since the particles are specifically designed to behave like hard spheres with no attractive forces. Where does the elasticity come from? The liquid drains from the filament faster than the particles causing them to poke through the surface as before,” he adds. “The liquid surface forms a meniscus around the particles. It is this curved surface of the fluid which the researchers believe stores the energy and results in the unusual behavior.”

Smith says he hopes the work “provides an important initial step in understanding how the physics in common industrial flows may differ from the carefully controlled set up found in conventional academic studies”

Researchers from the University of Edinburgh and Politecnico di Torino collaborated on the work.

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