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Nature 405, 27-28 (4 May 2000) | doi:10.1038/35011172

Fluid dynamics: Turbulence without inertia

Ronald G. Larson

In the 1880s Osborne Reynolds1 established that fluid inertia (that is, momentum) drives the irregular patterns observed in water flowing rapidly from a pipe, plumes emerging from a smokestack, eddies in the wake of a bulky object, and many other everyday phenomena. Known as 'turbulence', these patterns occur at high values of the Reynolds number, the dimensionless ratio of inertial to viscous force.