The invention relates to nozzles of heat and mass exchange devices. The element of the nozzle has the form of a straight regular hexagonal hollow prism with open bases, while it has three side faces separated from each other, interconnected by longitudinal ribs located inside the said hollow prism. Participation in the mass transfer process of the outer surfaces of the elements is provided provided that they are densely arranged in an orderly manner in the contact part of the mass transfer apparatus, which significantly increases the surface of the phase contact and increases the efficiency of the mass transfer process.

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