Heatsink and cooling device

Abstract

A heatsink, which is used with a fluid flow generator that rotates about a central axis extending vertically to generate a flow of fluid, includes a main body section having a top surface facing the fluid flow generator in a vertical direction, and fins that extend upward from the top surface so as to define a plurality of flow passages. Four regions defined by an X axis and a Y axis, which cross each other at an intersection between the central axis and the top surface and extend in an extending direction of the top surface, are referred to as a first region, a second region, a third region, and a fourth region, in order in a direction opposite to a rotation direction of the fluid flow generator. In a plan view from above, the plurality of flow passages form a plurality of fluid paths, each of which has an inlet disposed in at least one of the four regions for the fluid discharged from the fluid flow generator to flow in and an outlet disposed in the first region, and a fluid flow direction changes at an acute angle in the middle in at least one of the fluid paths having the inlet in the fourth region.