the object of the present invention is to provide a flow channel for liquids or also gases , which is of such a design that the lowest possible losses occur in the flow , in particular low frictional losses . a further aim of the invention is to provide a flow channel for liquids , in which different flow regions are set . a flow channel for liquids characterized in that at least one wall defining the flow channel is of such a configuration that when a liquid flows therethrough at least one flow region is produced which has an axial and simultaneous tangential flow component .