| 摘要 |
The heat-radiating system which radiates heat by heat exchange between a substrate 22 and cooling fluid. The heat-radiating system has a cooling structure that includes a vortex flow generating portion C1 on the surface of the substrate 22 in contact with the cooling fluid. The vortex flow generating portion C1 is composed of a plurality of recesses 22b that extend in the direction ² intersecting the flow direction of the cooling fluid and causes a vortex flow depending on the flow condition of the cooling fluid. The recess depth H of the vortex flow generating portion and the laminar sub-layer thickness ´ b near the wall surface satisfy the relation of H > ´ b = 63.5/(Re 7/8 )×d (where Re is the Reynolds number, d is the characteristic length, and the Reynolds number is Re = ud/v where v is the kinematic viscosity of the cooling fluid, u is the flow velocity of the cooling fluid and d is the characteristic length), and operation of the heat radiating system is controlled such that the flow conditions of the cooling fluid fall within the range in which the relation of u/v ‰¤ 206×d 1/7 (where u, v and d are as defined above) is satisfied. |
