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 varyi
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.
대표청구항▼
1. 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 exch
1. 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; anda flat base configured to interface the heat exchange device with a heat source. 2. The heatsink according to claim 1 wherein the heat exchange medium comprises a heat transfer fluid, and the forced convection device is configured to induce a turbulent flow of the heat transfer fluid adjacent to the external heat exchange surfaces. 3. The heatsink according to claim 1, wherein the heatsink is planar, and the plurality of heat exchange elements branch asymmetrically in two dimensions. 4. The heatsink according to claim 1, wherein the branched configuration of the plurality of heat exchange elements comprises branches which emerge from respective branch points in three dimensions. 5. The heatsink according to claim 1, wherein the heat exchange medium comprises air, and the fractal variation in the plurality of heat exchange elements substantially reduces a narrowband acoustic resonance resulting from a forced air flow over the external heat exchange surfaces of the plurality of branched heat exchange elements with respect to a corresponding plurality of heat exchange elements arranged in a regular pattern. 6. The heatsink of claim 1, wherein the heat exchange device comprises an element whose heat conductivity exceeds 850 W/(m*K). 7. The heatsink of claim 1, where the heat exchange device comprises graphene. 8. The heatsink of claim 1, where the heat exchange device comprises diamond. 9. The heatsink of claim 1, where the heat exchange device comprises a composition having an extended regular lattice which effectively supports coherent phonon transport over macroscopic distances. 10. The heatsink of claim 1, where the heat exchange device comprises aligned carbon nanotubes. 11. The heatsink of claim 1, wherein the heat exchange medium comprises a cooling fluid, and the plurality of heat exchange elements are configured to produce chaotically distributed asymmetric vortices in a convective fluid flow of the cooling fluid flowing about the heatsink. 12. The heatsink of claim 1, further comprising at least one connector, configured to connect with a solid to be cooled in at least one point. 13. The heatsink of claim 1, wherein the levels of asymmetric branching comprise a relative rotation of the respective heat exchange elements emerging from a branch to provide a three dimensional branched configuration. 14. The heatsink of claim 1, further comprising an aperture in the center of the heatsink. 15. 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; anddissipating 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. 16. The method according to claim 15, wherein the acoustic emission has a reduced peak narrowband acoustic resonance peaks with respect to a corresponding plurality of heat exchange elements arranged in a symmetric pattern. 17. 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, anda 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. 18. The heatsink of claim 17, further comprising a heat transfer surface adapted to receive heat by thermal diffusion from a device to be cooled. 19. The heatsink of claim 18, further comprising a thermal interface material at said heat transfer surface adapted to communicate heat between the device to the cooled and the heat exchange device. 20. The heatsink of claim 17, at least one portion the heat exchange device comprises a material having a bulk heat conductivity which exceeds 850 W/(m*K). 21. The heatsink of claim 17, where the heat exchange device comprises carbon nanotubes. 22. The heatsink of claim 17, further comprising at least one connector, designed to affix the heatsink to a solid object associated with a source of heat. 23. The heatsink of claim 17, wherein the forced convection device a pump or fan adapted to induce the turbulent flow of the heat transfer fluid with respect to the external surface boundary. 24. The heatsink of claim 17, wherein the forced convection device comprises a fan, and the plurality of heat exchange elements are configured to produce asymmetric vortices in a convective flow of the heat transfer fluid outside the external surface boundary. 25. The heatsink of claim 17, wherein the heat exchange elements each comprise a set of interconnected external solid-gas interface surfaces. 26. The heatsink of claim 17, wherein the heat transfer fluid is induced to flow outside the external surface boundary in a turbulent pattern in an acoustically non-resonant fluid flow pattern. 27. 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. 28. The method of claim 27, wherein the vortices are substantially non-uniformly distributed about the heat exchange device. 29. The method of claim 27, wherein the fractal relationship substantially reduces narrow band acoustic resonance as compared to a corresponding heat exchange device having a linear or Euclidian geometric variation between a plurality of heat exchange elements. 30. The method of claim 27, wherein the heat transfer fluid is not encased by the heat exchange device. 31. 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; anda 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. 32. The heatsink according to claim 17, wherein the heat transfer fluid comprises air, wherein the induced flow by the fan is uncontained and comprises an asymmetric pattern of vortices over the set of asymmetrical projections over a range of air flow rates.
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