Results of an experimental research of structure of an adiabatic two-phase (air-to-water) flow in tubes with the twisted tape insert are presented. The basic feature of structure in such channels is that a liquid phase part (and all liquid at the high range of gas qualities) moves in the form of a stream (a cord) on the tape and doesn’t contact to an active heat transfer surface. The device for an intensification of a heat and mass transfer (especially at boiling) in the form of the twisted tape with ribs discretely installed on an angle to a tape axis is offered. Ribs on a tape promote displacement of a liquid from a tape to a tube heat transfer surface. Results of an experimental research of a heat transfer and a hydraulic resistance in tubes with various tape twisting inserts also are presented. Possibility of an effective utilization of the twisted tapes with ribs for an intensification of a heat and mass transfer in tubes is shown.

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