Traveling waves in a fluid layer submitted to a horizontal temperature gradient

We report experimental observations of traveling waves in a pure fluid with a free surface situated in a long container submitted to a horizontal temperature gradient perpendicular to its large extension. Above a critical value of the gradient and depending on the height of liquid $h,$ a source of waves is created in the container for small value of $h,$ while the system exhibits stationary patterns for larger values of $h.$ The spatio-temporal properties of the waves are studied and compared to theoretical predictions. Email contact: daviaud@amoco.saclay.cea.fr