| 摘要 |
<p>A heat exchange plate (10) has protrusions (11) and recesses (12). The protrusion (11) having a curved outer peripheral surface is surrounded by adjacent protrusions placed at regular intervals on a circle around the protrusion (11) with the same central angle relative to the center of the protrusion (11). The recess (12) having a curved inner peripheral surface that partially extends to the curved outer peripheral surface of the protrusion (11) is placed in a predetermined arrangement that is deviated by the same pitch from the predetermined arrangement of the protrusions (11). The recesses (12) provide on the other surface of the plate with the same configuration as the protrusions (11). The protrusions (11) provide on the surface of the plate with the same configuration as the recesses (12), so as to provide on the opposite surfaces of the metallic plate with the same pattern of irregularity.</p> |
