| 摘要 |
PROBLEM TO BE SOLVED: To eliminate unevenness of concentration in a vertical direction of absorbing liquid at the surface of a heat transfer pipe, increase an interface disturbance and make a substantial improvement of a heat transfer performance. SOLUTION: This heat transfer pipe performs a heat exchanging operation between fluid in the pipe and fluid outside the pipe, wherein an outer circumferential surface of the heat transfer pipe 1 has at least two kinds of helical grooves M1, M2 in which directions of a twisted angleθin respect to a pipe axis Z are opposite to each other and the twisted angleθis in a range of 3 deg.-80 deg. and a groove depth of at least one helical groove M1 of the two kinds of helical grooves M1, M2 is different from that of the other helical groove M2.
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