Inverse lift: a signature of the elasticity of complex fluids?

Details Inverse lift: a signature of the elasticity of complex fluids? Inverse lift: a signature of the elasticity of complex fluids?

2004-11-25

arxiv.org/abs/cond-mat/0411632v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, revised version, submitted to PRL

Scientific paper

10.1103/PhysRevLett.95.168303

To understand the mechanics of a complex fluid such as a foam we propose a model experiment (a bidimensional flow around an obstacle) for which an external sollicitation is applied, and a local response is measured, simultaneously. We observe that an asymmetric obstacle (cambered airfoil profile) experiences a downards lift, opposite to the lift usually known (in a different context) in aerodynamics. Correlations of velocity, deformations and pressure fields yield a clear explanation of this inverse lift, involving the elasticity of the foam. We argue that such an inverse lift is likely common to complex fluids with elasticity.

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