S. Casado & W. González-Viñas & H.L. Mancini  'Testing the Kibble-Zurek mechanism in Rayleigh-Bénard convection' Phys. Rev. E 74 (4), 47101
We report experimental evidence of the fact that, in an emerging Rayleigh-Bénard structure, the density of defects which appear scales as a power law in the rate of change of the control parameter. The scaling exponents agree with those calculated from the Kibble-Zurek mechanism. This is the first evidence to our knowledge that this mechanism works in a hydrodynamical system.