| 摘要 |
PROBLEM TO BE SOLVED: To improve transferring efficiency by reducing friction resistance.SOLUTION: A pipe line is constituted by connecting liner round pipe bodies 2. In the pipe body 2, fins 4A and 4B are provided to face with each other in a pipe top portion 3T and a pipe bottom portion 3B of an inner peripheral surface 3, that is, portions intersecting with a vertical surface including a pipe axis O1. The fins 4A and 4B are constituted by a sintered resin narrow rod-like body having a triangular cross section. A recessed groove 5 is formed along the pipe axis O1 direction respectively in the pipe top portion 3T and the pipe bottom portion 3B of the pipe body 2. Bottom portions of the fins 4A and 4B are attached to the recessed groove 5. The fins 4A and 4B having the triangular cross section are provided on the inner peripheral surface of the pipe body 2 in such a manner of facing with each other, and therefore, a secondary flow is generated in a cross sectional direction of the flow when fluid flows in the pipe body 2.SELECTED DRAWING: Figure 1 |
