| 摘要 |
The exchanger tube has a smooth outside surface and a structured inside surface. The inside surface is formed from parallel primary and secondary ribs that run at an angle with respect to the longitudinal tube axis and respectively comprise inclined, planar flanks, channels that are limited laterally by the primary and secondary ribs and troughs shaped into the primary and secondary ribs. The radial extension of the secondary ribs is less than that of the primary ribs. The troughs are triangular. The center longitudinal planes of the troughs are disposed at an angle with respect to the longitudinal tube axis. The summits of the primary and secondary ribs are rounded. Rounded chamfers are provided between the flanks of the primary and secondary ribs and the channel beds.
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