Cooling structure, vortex-flow forming plate molding apparatus, and method for molding vortex-flow generating portion

摘要

A cooling structure for cooling a heat generating element allows cooling fluid to circulate around the heat generating element or a base material with the heat generating element disposed thereon. The cooling structure is provided with a vortex-flow generating portion which extends in a direction intersecting a circulation direction of the cooling fluid, and which generates a vortex flow depending on the flow rate of cooling fluid.

主权项

1. A cooling structure to cool a heat generating element by allowing a cooling fluid to flow and come into contact with the heat generating element or a base material with the heat generating element disposed thereon, comprising:
a vortex-flow generating portion, which extends in a direction intersecting a circulation direction of the cooling fluid, and which generates a vortex flow in accordance with a flow rate of the cooling fluid, wherein the vortex-flow generating portion includes a plurality of concave portions arranged at predetermined intervals, W+=Wuτ/ν is set within a range of 25 to 300, where W+=Wuτ/ν is a value given by nondimensionalizing an opening width W as measured in meters of each of the plurality of concave portions by using a shear rate of uτ=(Tω/ρ)1/2 as measured in meters per second calculated from a shear stress τω as measured in Newtons per meter squared and a fluid density ρ as measured in kilograms per meter; an experimental formula of a pipe friction coefficient, represented by Cf=τω/(0.5ρu2)=0.73 Re−0.25 calculated from a flow rate u as measured in meters per second, the fluid density ρ, and the Reynolds number Re; and a kinematic viscosity ν as measured in meters squared per second, wherein a maximum height H as measured in meters of each of the plurality of concave portions is set smaller than a distance X from an opening surface of each of the plurality of concave portions to a flow passage surface facing the opening surface, and a representative length d=4A/L is set to 0.007 m or more, wherein A as measured in meters squared is the minimum flow passage sectional area and L as measured in meters is the maximum wetted perimeter length of the flow passage section perpendicular to the circulation direction of the cooling fluid.