| 摘要 |
PURPOSE:To provide a heat transfer tube for boiling excellent in the heat transfer performance by inserting a screen mesh provided with a large number of holes each of which has a diameter larger than the distance of a gap between a vertical line and a lateral line, along the inner wall surface of the heat transfer pipe thereby to thermally fixing the screen mesh to the heat transfer tube. CONSTITUTION:A screen mesh 7 thermally and tightly adhering to the inner wall surface of a heat transfer surface 6, is provided with holes 9 each of which has a diameter which is larger than a gap between strands, in a zigzag manner. Hence, a fluid of a main current part within the pipe can flow in the direction of an arrow 10 on the inner wall surface of the heat transfer tube 6 through holes 9. Thus, even when the heat transfer quantity is increased, and the evaporation quantity from the screen mesh 27 increases, vapor flows out in the direction of an arrow 11 to the main flow part from a depressions 8 which are active boiling nuclea between the strands of the mesh 7, and the fluid at the main flow part flows into onto the inner wall surface through the holes 9 in the direction of an arrow 10. Thus, the fluid is supplied to the boiling nucleus 8. The fluid which flows in and from the nucleus 8 and the flow of vapor do not oppose to each other, and at the time of a high heat flow, the heat transfer surface does not dry out. |
