Heat transfer device with anisotropic thermal conducting micro structures

Abstract

An isotropic thermal conducting material are arranged in a heat dissipating device to create directional adiabatic heat transfer. In one embodiment, a preferential heat conduction is provided between a heat source and an absorption layer, an absorption layer and a cooling substance, and a cooling substance and a dissipation layer. Structures are further provided to create adiabatic channeling between an absorption and a dissipation.

1 . A heat transfer device comprising
 an absorption section comprising an absorption layer having a first face and a second face on opposite sides of said absorption layer; wherein said first face is made for contacting a heat source;   a dissipation section for removing heat from said device;   a means for directing a cooling substance to or away from said absorption layer; and a means to move said cooling substance to or away from said dissipation section;   wherein for both said first face and second face, a layer or a structure comprising an anisotropic thermal conducting substance is placed on or in close contact to the surfaces thereof;   wherein said anisotropic thermal conducting substance has a thermal conductance substantially higher in one direction (the longitudinal direction) than in a direction perpendicular to said longitudinal direction.   
     
     
         2 . The device according to  claim 1  wherein said structure comprising an anisotropic heat conducting substance comprises a plurality of micro or nano structures. 
     
     
         3 . The device according to  claim 1  wherein said anisotropic thermal conducting substance is arranged preferentially to have the longitudinal direction of higher thermal conductance substantially perpendicular to the surface of said second face. 
     
     
         4 . The device according to  claim 1  wherein said anisotropic heat conducting substance provides a thermal conductance substantially higher in one direction (longitudinal) than the transversal directions. 
     
     
         5 . The device according to  claim 1  wherein said anisotropic thermal conducting substance comprises one of the group of graphite, carbon nano tube, graphene, charcoal layer, charcoal sheet, similar tubular or layered structures, or sheet of carbon structures, or similar structures containing metal substitutes for carbon. 
     
     
         6 . The device according to  claim 1  wherein said anisotropic thermal conducting substance is arranged in a manner that the longitudinal direction of the second anisotropic substance is substantially perpendicular to the surface of said first face. 
     
     
         7 . A heat transfer device comprising:
 an absorption section comprising an absorption layer having a first face and a second face on opposite sides of said absorption layer; wherein said first face is made for contacting a heat source, and said second face is made for contacting a cooling substance;   a dissipation section for removing heat from said device;   a means for directing a cooling substance between said absorption section and said dissipation section;   wherein a structure or a layer, comprising an anisotropic heat conducting substance, is placed on or in close contact with said first face;   wherein said anisotropic thermal conducting substance has a thermal conductance substantially higher in one direction (the longitudinal direction) than in a direction perpendicular to said longitudinal direction.   
     
     
         8 . The device according to  claim 7  wherein said structure or layer, comprising an anisotropic heat conducting substance, comprises a plurality of micro or nano structures. 
     
     
         9 . The device according to  claim 7  wherein said anisotropic thermal conducting substance is arranged preferentially to have the longitudinal direction of higher thermal conductance substantially perpendicular to the surface of said first face. 
     
     
         10 . A heat transfer device comprising:
 a heat absorption layer having a first face and a second face on opposite sides of the layer; wherein said first face is made for contacting a heat source;   a means for directing a cooling substance to or away from said second face;   wherein for both said first face and second face, a layer or a structure comprising an anisotropic thermal conducting substance is placed on or in close contact to the surfaces thereof.   
     
     
         11 . The heat transfer device according to  claim 10  wherein said first face comprises a structure comprising carbon-containing substance having more than 50% carbon content. 
     
     
         12 . The device according to  claim 10  wherein said carbon nanostructures are formed directly on the surface of said first and second faces in a gas-phase or liquid-phase chemical deposition. 
     
     
         13 . A heat transfer device comprising:
 a heat absorption layer having a first face and a second face on opposite sides of the layer; wherein said first face is made for contacting a heat source;   a means for directing a cooling substance to or away from said second face;   wherein for both said first face and second face, a layer or a structure comprising an anisotropic thermal conducting substance is placed on or in close contact to the surfaces thereof.   
     
     
         14 . The device according to  claim 13  wherein both said first and second faces comprise anisotropic thermal conducting substance formed directly onto the surface of the faces in a gas-phase or liquid-phase chemical deposition process. 
     
     
         15 . The device according to  claim 13  wherein said anisotropic thermal conducting substance comprises a plurality of micro or nano structures having substantially greater dimension in one direction (the longitudinal direction) than one of the transversal directions.