| 摘要 |
PURPOSE:To provide a heat tansfer tube of high heat transfer efficiency which can be manufactured readily, by tightly fixing the outer periphery of a coil of a metal fine wire inserted into the inner part of a metal tube wound in a spiral form, to the inner surface of the tube and bonding thereon a pulverulent member to the tube inner surface to form a porous member layer. CONSTITUTION:A coil 2 made of a fine wire 2a made of copper, brass or the like is inserted into a metal tube 1, and the outer periphery of the coil 2 is tightly fixed to the inner surface of the metal tube 1. Further, a large number of pulverulent members P are laminated thereon and bonded thereto by means of brazing to form a porous body layer. The heat transfer area on the inner surface of the heat transfer tube 1 is increased by the coil 2 and the flow of a coolant becomes turbulent. When the winding pitch of the coil 2 is made dense, gaps finely continue are formed on the inner surface of the tube to produce a capillary phenomenon, and nucleus boiling tends to occur and the heat transfer efficiency is improved. Further, respective operations are effectively promoted and the heat efficiency is further improved. |
