Heat exchange – With coated – roughened or polished surface
Patent
1997-03-17
1999-11-30
Flanigan, Allen
Heat exchange
With coated, roughened or polished surface
165184, 165DIG515, F28F 1318
Patent
active
059925124
ABSTRACT:
A heat exchanger tube for effecting a heat exchange between a fluid inside the heat exchanger tube and another fluid flowing outside the heat exchanger tube, which is provided with a first kind of spiral grooves and a second kind of spiral grooves, each being formed on an outer surface of the heat exchanger tube. The twisting direction of the first kind of spiral grooves in relative to the axis of the heat exchanger tube is the same as that of the second kind of spiral grooves but differs in helix angle from each other with helix angles of the first kind of spiral grooves and the second kind of spiral grooves falling within the range of 3.degree. to 80.degree. in relative to the axis of the heat exchanger tube.
REFERENCES:
patent: 3025685 (1962-03-01), Whitlow
patent: 3481394 (1969-12-01), Withers, Jr.
patent: 3906605 (1975-09-01), McLain
patent: 4044797 (1977-08-01), Fujie et al.
patent: 4330036 (1982-05-01), Satoh et al.
Isobe Gou
Kameoka Hideaki
Nishizawa Takeshi
Ozaki Masanori
Tsuri Koutaro
Flanigan Allen
The Furukawa Electric Co. Ltd.
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