| 摘要 |
PURPOSE:To improve heat transmission coefficient and miniaturize the heat exchanger by a method wherein a plurality of heat transfer tubes for flowing fluid, whose heat is exchanged, are arranged in the heat dissipating section of foamed metal, worked so as to have various configurations, and air is passed through cavities in the heat dissipating section. CONSTITUTION:The meandering heat transfer tube 5 is pinched between the groove 6 of the heat dissipating sections 4 of foamed metal while the heat dissipating sections 4, 4' are joined and bonded by spot welding or the like. The heat transfer tube 5 is contacted thermally with the heat dissipating sections 4, 4' by expanding the tube with hydraulic pressure or the like. The cavities 8 of the foamed metal are continuous and air, passing through the cavities, becomes turbulent flow, therefore, heat transmission may be expedited. On the other hand, the turbulent flow of the air is expedited, therefore, air stagnation area will never be generated behind the heat transfer tube 5 substantially and the heat transmission coefficient may be improved. |
