Effect of Gravity on the Dynamics of Nonequilibrium Fluctuations in a Free-Diffusion Experiment
Diffusion is commonly believed to be a homogeneous process at the mesoscopic scale, being driven only by the random walk of fluid molecules. On the contrary, very large amplitude, long wavelength fluctuations always accompany diffusive processes.14In the presence of gravity, fluctuations in a fluid containing a stabilizing gradient are affected by two different processe
gravity dynamics fluctuations diffusion dynamic shadowgraph free diffusion nondiffusive decay scattering shadowgraph