| 摘要 |
PURPOSE:To improve a mean surface thermal conduction rate and enable a compact device to be provided by a method wherein the upper edges of the raised portions in which a part of fins between the thermal conduction pipes are oppositely faced to the air flow and their downstream sides are opened are formed as a triangle or rectangular shape or the like having corrugated shape. CONSTITUTION:Air flow is struck against the raised portions 9, changes its flowing direction, a part of the air flow passes through the upper holes 10 onto the fins 7, a part of the air flow is changed in its flowing direction by the concave portions 9a and projections 9b of the raised portions 9, so that the air flow blown up through the holes 10 from below and the air flow of which flow is inhibited by the concave portions 9a and concave portions 9b of the raised portions 9 and varied in its direction are interfered to each other to form the eddy current. Since the air flow blown up by the corrugations of the holes 10 from below contains a secondary flow component, the generated eddy current becomes stronger and the efficiency of thermal conduction at the rear part can be improved. In this way, it is possible to provide a heat exchanger having compact fins of better thermal conduction. |
