Algebraic decay of velocity fluctuations in a confined fluid
Computer simulations of a colloidal particle suspended in a fluid confined by rigid walls show that, at long times, the velocity correlation function decays with a negative algebraic tail. The exponent depends on the confining geometry, rather than the spatial dimensionality. We can account for the tail by using a simple mode-coupling theory which exploits the fact that the sound wave generated by a moving particle becomes diffusive.
|Journal||Phys. Rev. Lett.|
Hagen, M. H. J, Pagonabarraga, I, Lowe, C. P, & Frenkel, D. (1997). Algebraic decay of velocity fluctuations in a confined fluid. Phys.Rev.Lett., 78, 3785–3788.