| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat transfer tube with high heat exchange rate compared with the one having a constant depth of a corrugated groove, and reducing a pressure loss, and also to provide a heat exchanger, and a processed product of the heat transfer tube. SOLUTION: The heat transfer tube 1 includes: a main tube 2 having an inner peripheral surface 2a and an outer peripheral surface 2b; and spiral convex parts 31 formed on the inner peripheral surface 2a of the main tube 2 by forming the spiral corrugated grooves 3 on the outer peripheral surface 2b. The inner peripheral surface 2a of the main tube 2 has an area where the heights of the convex parts 31 periodically change. COPYRIGHT: (C)2011,JPO&INPIT
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