Abstract: A method and apparatus for the continuous multiplied enrichment of gaseous isotopes of heavy elements by means of gravity-and expanding pressure fields and gas circulation is disclosed. The method is carried out in a pipe or tube with a smooth inner surface and having an inlet and first and second discharge means. One or several nozzles are arranged adjacent the inlet and extend in a plane perpendicular to the pipe axis so as to discharge tangentially relative to the inside pipe circumference. The first discharge means is formed by annular slots situated at the inner circumference of the pipe or it is formed in the region of the pipe axis. In an alternative embodiment of the pipe, the first discharge means is in the form of openings extending tangentially from the inner pipe circumference. The second discharge means is spaced from the first discharge means and is in the form of an annular aperture adjacent the pipe axis and in the vicinity of the inlet.