发明名称 |
METAL PIPE AND METHOD FOR MANUFACTURING SAME |
摘要 |
A metal pipe according to the invention has a plurality of ridges that have different heights, extend in the axial direction, and are arranged in the circumferential direction at its inner circumferential surface. If the Reynolds number changes and the streak structure and the scale of a hairpin vortex change, the streak and the hairpin vortex each match any one of the ridges. Therefore, the fluid friction can be reduced in a wide Reynolds number range. |
申请公布号 |
EP1857722(A1) |
申请公布日期 |
2007.11.21 |
申请号 |
EP20060713980 |
申请日期 |
2006.02.17 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
TAKEISHI, YOSHIAKI;AMAYA, HISASHI;UEDA, MASAKATSU;TAKABE, HIDEKI;KIMURA, SHIGEMITSU |
分类号 |
F16L9/02;B21C1/24;B21C37/08;B21D17/04;F15D1/06 |
主分类号 |
F16L9/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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