A distributor tray for a gas and a liquid circulating as a co-current, said tray comprising a plate perforated by orifices and supporting hollow chimneys extending perpendicularly to said plate, each orifice of the plate being surmounted by a chimney of identical cross section to said orifice, characterized in that the plate is equipped with a plurality of openings arranged on the periphery of each chimney inside a circumscribed circle, the center of which coincides with the center of the chimney, and the radius of which is less than or equal to ⅓ of the shortest distance separating two adjacent chimneys, and in that a single deflector element is arranged beneath each chimney, the openings and the deflector element associated with each of the chimneys being so arranged as to impart a rotating movement to the gas/liquid mixture under each chimney.