Nonperiodic time dependence at the onset of convection in a binary liquid mixture
We report measurements of the convective heat transport near the onset of convection in a normal 3He-4He mixture for values of the separation ratio ψ between -0.044 and -0.010. For ψ≲−0.018, the first bifurcation was to a relatively large-amplitude time-dependent state with characteristic frequencies over an order of magnitude smaller than predicted by linear-stability analysis. The onset of the time dependence was intermittent and not hysteretic. Above onset, the frequency spectrum of the time dependence either contained discrete frequencies or not, depending on ψ.
Sullivan, Timothy and Ahlers, Guenter, "Nonperiodic time dependence at the onset of convection in a binary liquid mixture" (1988). Physical Review A 38(6): 3143-3146. Faculty Publications. Paper 308.
Physical Review A