Patent ID: 6840307
Filing Date: 2005-01-11
Classification: F28F,H01L,Y10S,Y10T

Abstract:
1. A heat sink for electrical or electronic components comprising: a heat spreader plate to which the components to be cooled are connected; at least two heat conducting fins that are positioned substantially parallel to one another and which are connected substantially perpendicular to said heat spreader plate; at least one foam block that is disposed in the space between parallel fins wherein said block is formed of reticulated foam to define a highly porous, heat conducting, open-celled structure that permits a cooling fluid to flow through said block as the cooling fluid passes across said fins; and said at least one foam block being made from aluminum, copper, graphite, or aluminum-nitride ceramic wherein the fin height, b, is determined by the relationship, where, k δ h is the convective heat transfer coefficient for the foam-filled space bounded by said fins and said heat spreader plate, Btu/ft where, h is the linear density of said at least one foam block, pores per ft φ is the porosity of said at least one foam block, expressed as a fraction ρ is the density of the cooling fluid that passes across said fins, lb k is the thermal conductivity of the cooling fluid, Btu/ft s ° F. c μ is the dynamic viscosity of the cooling fluid, lb u