The device has a trough (20) whose two side walls and base wall are formed such that a section of an outlet end of the trough causes displacement of baric center positions (B1, B2) of a particle flow section at the level of the end in a direction (51) opposite a rotation direction (28) of a spreader disk (24), when quantity of particles in the trough increases from one level (N1) to another level (N2). The side walls are not symmetric with respect to a plane perpendicular to the base wall, and form respective angles ranging between 50 and 75 degree and 110 and 130 degree, with the base wall.
