Elastic fluids

those which have the property of expanding in all directions on the removal of external pressure, as the air, steam, and other gases and vapors.
- Rankine.

See also: Elastic

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"Air's a perfectly elastic fluid," roars George above the tumult.
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A bio-mechanical experiment carried out at the University Of Pennsylvania School Of Engineering and Applied Science has answered a long-standing theoretical question if microorganisms swim faster or slower in elastic fluids and the answer is "slower", the university website said
The report said some animals, microorganisms and cells move in a wave pattern and they often do so through elastic fluids. Movements of worms on aerated wet soil and sperm racing toward an egg are all due to this phenomena which deal with our everyday life.
"There have been qualitative observations of sperm cells, for example, where you put sperm in water and watch their tails, then put them in an elastic fluid and see how they swim differently," Arratia said in the University website.
Pennsylvania varsity group answers long-pending questions on swimming in elastic liquids
Marcet's terms, such as "elemental bodies," "constituent parts" and "elastic fluids" (gases) sound odd today, but she did use them very effectively to explain the phenomena she explored with her two curious students.
Jane Haldimand Marcet a popular science writer
Two-dimensional (2-D) flow of elastic fluids in a steady lid-driven cavity was studied by Pakdel et al.
They also found that the torsionally driven cavity is a suitable geometry for testing the ability of non-Newtonian constitutive models to describe the behavior of elastic fluids in 3-D flows.
Characterization of viscoelastic fluid flow in a periodically driven cavity: flow structure, frequency response, and phase lag
This suggests that elastic fluids generate extra stress above the shear stress in the direction of the flow.
Sensor aids stress studies; engineers construct a new rheology-tailored sensor based on differential pressure
Static numerical simulations (water-based fluid flowing around an immobile oil droplet) showed that additional forces are present in the case of elastic fluids. Dynamic simulations revealed striking differences in the behavior of elastic and inelastic fluids; oil droplets underwent deformation over time when inelastic fluids were injected, but the droplet did not deform in the presence of elastic fluids [21].
Study on Mechanism of Viscoelastic Polymer Transient Flow in Porous Media. (Research Article)
The model of [v.sub.t] by (17) and (19) satisfies the following two assumptions: first, very small-scale eddies are damped by the elastic behavior of the fluid and thereby the eddy viscosity decreases ([v.sub.t] [right arrow] 0 when [t.sub.[eta]] << [lambda]); secondly, the eddy viscosity for less elastic fluid is close to be that for the Newtonian case ([v.sub.t] [right arrow] (2) when [t.sub.[eta]] >> [lambda]).
Proposal of damping function for low-Reynolds-number k-[epsilon] model applicable in prediction of turbulent viscoelastic-fluid flow

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