The Japan Steel Works, Ltd.

Masashi Tomiie

Takashi Iwamoto

Shunroku Sukumoda

Yukio Sato

Yasushi Owaki

Masayuki Kawai

Shinichi Ono

Kohtaroh Nagahara

In a heat transfer pipe, annular grooves in a direction inclined at an angle of 45&deg; to 90&deg; with respect to an axis of the pipe are continuously formed at an interval in a longitudinal direction of the pipe. The annular grooves desirably have a groove depth of 0.20 mm or more, and a groove pitch of two to five times larger than the groove depth. Moreover, a ratio W/P of a bottom width W of projections of the grooves to the groove pitch P is desirably 0.1 to 0.9.

Heat transfer pipe for liquid medium having grooved inner surface and heat exchanger employing the same

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Tokyo, Japan

Masashi Tomiie