  Granular media are examined with the focus on polydisperse mixtures in the
presence of two localized heat-baths. If the two driving energies are similar,
the large particles prefer to stay in the `cold' regions of the system -- as
far away from the energy source as possible. If one of the temperatures is
larger than the other, the cold region is shifted towards the colder reservoir;
if the temperature of one source is much higher, a strong, almost constant
temperature gradient builds up between the two reservoirs and the large
particles are found close to the cold reservoir. Furthermore, clustering is
observed between the heat reservoirs, if dissipation is strong enough.
