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US 9,228,785 B2Granted
Fractal heat transfer device
OwnerAlexander Poltorakinventor
Life of this patent
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Abstract
A heatsink comprising a heat exchange device having a plurality of heat exchange elements each having a surface boundary with respect to a heat transfer fluid, having a fractal variation therebetween, wherein the heat transfer fluid is induced to flow with respect to the plurality of fractally varying heat exchange elements such that flow-induced vortices are generated at non-corresponding locations of the plurality of fractally varying heat exchange elements, resulting in a reduced resonance as compared to a corresponding heat exchange device having a plurality of heat exchange elements that produce flow-induced vortices at corresponding locations on the plurality of heat exchange elements.
Claims32
A heatsink comprising:
- a heat exchange device having a plurality of heat exchange elements in a branched configuration having at least three levels of asymmetrical branching, having a fractal variation between respective branches, each heat exchange element having an asymmetric external heat exchange surface configured to transfer heat to a heat exchange medium outside of the heat exchange device;
- a forced convection device configured to induce a flow of an gaseous heat exchange medium outside of the heat exchange device, wherein the induced flow is associated with acoustic emissions from an interaction of the flowing heat exchange medium with the heat exchange device;
- and
- a flat base configured to interface the heat exchange device with a heat source.
1 more element
A method of cooling a solid comprising the steps of:
- connecting the solid with a heatsink comprising a heat exchange device having a plurality of heat exchange elements having an asymmetric fractal branching pattern encompassing at least three levels of branching, each heat exchange element having an external heat exchange surface;
- transferring heat from the solid to the heatsink;
- and
- dissipating the heat from the heatsink by inducing a flow of a heat transfer fluid over the respective external heat exchange surfaces of the plurality of heat exchange elements with a forced convection device, wherein the flow of the heat transfer fluid over the external heat exchange surface is associated with an acoustic emission.
1 more element
A heatsink comprising:
- a heat exchange device having a plurality of heat exchange elements each having an external surface boundary with respect to a heat transfer fluid, having an asymmetric fractal variation therebetween, and
- a forced convection device configured to induce a turbulent flow of the heat transfer fluid about the external surface boundary,
- wherein the heat transfer fluid is induced to flow with respect to the external surface boundary of the plurality of fractally varying heat exchange elements such that flow-induced vortices are generated at chaotically distributed asymmetric locations with respect to the plurality of fractally varying heat exchange elements, resulting in acoustic emissions having a reduced resonance as compared to acoustic emissions from a corresponding heat exchange device having a plurality of symmetric heat exchange elements that produce flow-induced vortices at symmetric locations on the plurality of heat exchange elements.
A method of cooling a solid comprising the steps of:
- connecting the solid with a heatsink comprising:
- a heat exchange device having an asymmetric multilevel branched array comprising, at each level of branching, a plurality of non-identically shaped heat exchange elements which have a respective physical configuration which varies according to a fractal relationship and an external heat exchange surface;
- inducing a heat transfer fluid to flow over the external heat exchange surfaces of the plurality of heat exchange elements over a range of flow rates, wherein the fluid flow over the range of flow rates induces chaotically distributed asymmetric vortices adjacent to the external heat exchange surfaces of the heat exchange elements in selectively dependence on at least the respective physical configuration of the heat exchange elements, and the flow over the range of flow rates is associated with acoustic emissions.
A heatsink, comprising:
- a heat conductive body having a heat exchange surface, adapted to conductively exchange heat with an object contacting the heat exchange surface;
- a set of asymmetrical projections, extending from the body, comprising at least two projections each having at least two hierarchical levels of branching, wherein the proportions of each branch asymmetrically differ between different projections;
- an external surface of at least a terminal branch of each projection, adapted to conductively and radiatively transfer heat, wherein a radiative heat transfer between respective terminal branches is asymmetric;
- and
- a fan configured to induce a flow of a gaseous heat transfer fluid surrounding the set of asymmetrical projections, wherein the induced flow produces acoustic emissions,
- wherein the asymmetrically differing proportions of the branches substantially reduces narrow band acoustic resonance in the heat transfer fluid flowing over the set of asymmetrical projections, as compared to a corresponding heatsink symmetric branches having symmetric differences in proportions of respective branches.
3 more elements
Dependencies are inferred from the claim text.