Title:
不連続の両方向傾斜内部リブ付き増強熱交換管
Document Type and Number:
Japanese Patent JP2006514733
Kind Code:
A
Abstract:
An enhanced heat transfer tube with discrete bidirectionally inclined ribs (DBIR-tube) provides enhanced convective heat transfer both in laminar and turbulent flow regions. The inner surface of the tube is formed with bidirectionally inclined ribs, including left hand inclined ribs and right hand inclined ribs, with the ribs being in the form of discrete strip-like protrusions which respectively form a certain angle with respect to the axis of the tube and incline in two directions. With the hydrodynamic inner diameter of the tube represented by "d", each bidirectionally inclined rib has a height less than or equal to 0.2 d, a circumferential width less than or equal to 0.5 d, and an axial length less than or equal to 2 d. A certain angle formed between the axis of each rib and the axis of the tube is ±5° to ±85°, the positive sign meaning that the internal rib is orientated in a right hand declining direction, and the negative sign meaning that the internal rib is orientated in a left hand declining direction.
Inventors:
Guo, Zen Yuan
Men, Gien
Fu, Weilin
Li, Dicin
Men, Gien
Fu, Weilin
Li, Dicin
Application Number:
JP2004571496A
Publication Date:
May 11, 2006
Filing Date:
October 27, 2003
Export Citation:
Assignee:
TSINGHUA UNIVERSITY
International Classes:
F28F1/40; F28F1/42
Domestic Patent References:
| JP2002090081A | 2002-03-27 | |||
| JP2000111291A | 2000-04-18 | |||
| JP2002130976A | 2002-05-09 | |||
| JP2002257432A | 2002-09-11 | |||
| JPH0926279A | 1997-01-28 | |||
| JPS61289293A | 1986-12-19 | |||
| JPH07208888A | 1995-08-11 | |||
| JPH09257384A | 1997-10-03 |
Foreign References:
| US4470452A | 1984-09-11 |
Attorney, Agent or Firm:
Keiichiro Saikyo
Takeshi Sugiyama
Minetarou Hirose
Takeshi Sugiyama
Minetarou Hirose