An experimental study of time-dependent Bénard-Marangoni convection in small aspect
ratio containers and high Prandtl number fluids is presented. Two similar systems with the
same aspect ratio, depth, and type of fluid are compared: one with adiabatic lateral
boundaries and the other with open boundaries. In spite of the fact that very different plan
forms and flows appear, both systems exhibit an oscillating plan form and a discrete narrow-
band frequency spectrum in the temperature signal, having the same threshold and similar …