A gas/liquid heat and/or mass exchanger including a chamber to hold the liquid, the bottom wall of the chamber defining at least one outlet orifice. A plurality of thin guide filaments descends from the orifice or orifices, and at least one thin, falling film of liquid flows down the filaments. The guide filaments are preferably substantially straight and under longitudinal tension. They may be either vertically oriented or tilted, and each one may be either a monofilament of multiple filament. An array of guide filaments may descend from each outlet orifice, and all such arrays may be parallel. A preferred form of the method of forming each outlet orifice is disclosed. A non-fouling nozzle for controlling the flow of liquid is disclosed as a subcombination.
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