Thermoacoustic separation of a He-Ar mixture

We report observation of a new mixture-separation process: an insonified mi xture of helium and argon in a narrow duct spatially separates along the ac oustic-propagation axis. We measure mole-fraction differences across the en ds of the duct as large as 7%. We measure initial separation flux densities as high as 10(-3) M-2 c, where M is the acoustic Mach number and c is the sound speed. This initial separation flux, as a function of both the amplit udes and the relative phasing of the pressure and velocity oscillations in the duct: agrees well with a recent theory involving oscillatings thermal d iffusion in the acoustic boundary layer.