The Japan Steel Works, Ltd.

Masayuki Kawai

Takashi Iwamoto

Shunroku Sukumoda

Yukio Sato

Yasushi Owaki

Kotaro Chiba

Shinichi Ono

Kohtaroh Nagahara

Motohide Hatanaka

Masashi Tomiie

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

A vessel for use in hydrothermal synthesis, comprises: a vessel body to be heated from outside; an inner tubular vessel which is placed within the vessel body with a tubular gap being formed therebetween, the inner tubular vessel having an inner surface which is formed of a precious metal such as silver, gold or platinum, and having a cover with a first small hole therein; and a buffer compartment for covering the first small hole, the buffer compartment having one wall which is defined by the cover and having the other wall with a second small hole therein.

Vessel for use in hydrothermal synthesis

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Muroran, Japan

Masayuki Kawai