| 摘要 |
The tube walls in section crossways to the corrugations and correspondingly crossways to the plate longitudinal direction, have a corrugation pattern in the form of a periodically transversal wave curve (2) with sinus wave-form basic shape and alternating valleys (4) and peaks (3) in the XY plane. - The X-direction is the wave curve extending direction and the Y-direction is the transversal direction in towards the tube interior. The tube wave curve within a sector (S) of the peaks (3) directed towards the tube interior, has at least two inflection points (6,7) on opposite sides of a symmetry point (8) on the peak crown. - (Dwg.3/3) |
