Abstract: A tunable oscillating heat pipe system that includes an oscillating closed loop heat pipe configured for movement of a fluid in an internal passage in the closed loop to transfer heat from a first portion of the closed loop to a second portion. The heat pipe system further includes a valve arranged in a section of the internal passage movable between an open position and a closed position. In the open position, the valve is arranged to permit movement of the fluid in the internal passage and in the closed position, the valve is arranged in the internal passage to limit movement of the fluid in a part of the internal passage. Movement of the valve between the open position and the closed position can be a function of at least one of temperature at the first portion, temperature at the second portion, or temperature at the valve.

Abstract: An electronic device includes a semiconductor substrate and a heat sink arranged on a surface of the semiconductor substrate. The heat sink includes a plurality of metal filaments that each includes a first end joined to the surface, a second end, and a body over the surface such that the body is surrounded by a coolant medium to dissipate heat. The heat sink is not part of an electrical network.

Abstract: An electronic device includes a semiconductor substrate and a heat sink arranged on a surface of the semiconductor substrate. The heat sink includes a plurality of metal filaments that each includes a first end joined to the surface, a second end, and a body over the surface such that the body is surrounded by a coolant medium to dissipate heat. The heat sink is not part of an electrical network.

Abstract: A method includes using electroforming to deposit a first portion of material. The method also includes placing a preformed tube on the first portion of material, where the preformed tube includes multiple capillary pathways and multiple bends. The method further includes using electroforming to deposit a second portion of material over the first portion of material and over the preformed tube to form a heat exchanger. The preformed tube forms at least a portion of a pulsating heat pipe within the heat exchanger, and the pulsating heat pipe is configured to transport thermal energy through the heat exchanger.

Abstract: A method for making a cold plate includes the steps of positioning a finstock structure in a cavity of a substrate; and applying a cover to the finstock structure and substrate, wherein the applying step comprises ultrasonically additive manufacturing the cover to the substrate and the finstock structure, whereby the cover joins with the substrate and the finstock structure. The resulting cold plate assembly includes a substrate having a cavity, a finstock structure within the cavity, and a cover closing the finstock structure within the cavity, the cover being integrally joined to the substrate and to the finstock structure.

Abstract: A coldplate assembly includes a plurality of leak-tight conduit modules provided between a base and a cover to couple a first manifold cavity to a second manifold cavity. Each leak-tight conduit module includes a heat conducting structure and is pre-constructed and pre-tested prior to integration into the coldplate assembly. Each leak-tight conduit module is sealed only near the ends of the module that are disposed in the respective manifold cavity.

Abstract: A method for making a cold plate includes the steps of positioning a finstock structure in a cavity of a substrate; and applying a cover to the finstock structure and substrate, wherein the applying step comprises ultrasonically additive manufacturing the cover to the substrate and the finstock structure, whereby the cover joins with the substrate and the finstock structure. The resulting cold plate assembly includes a substrate having a cavity, a finstock structure within the cavity, and a cover closing the finstock structure within the cavity, the cover being integrally joined to the substrate and to the finstock structure.

Abstract: A radio frequency (RF) waveguide housing includes a metal-diamond base with a first surface and a second surface opposite the first surface. The metal-diamond base includes an opening through a thickness of the metal-diamond base, and the opening includes a first side on a side of the first surface of the metal-diamond base and a second side on a side of the second surface of the metal-diamond base. The RF waveguide housing also includes an insert to be inserted in the opening and affixed to the metal-diamond base. The insert defines an interior volume within the opening of the metal-diamond base and a shape of the insert at the first side of the opening is configured to match an end of an RF waveguide coupled to the RF waveguide housing.

Abstract: An apparatus includes a coldplate and a bus bar. The coldplate is configured to be thermally coupled to a structure to be cooled and to remove thermal energy from the structure. The bus bar is integrated into the coldplate and is configured to deliver power to multiple components of the structure. The apparatus may also include multiple mounting holes positioned in rows on the coldplate and configured to mechanically couple the structure to the coldplate, where one of the bus bar or an additional bus bar is integrated between each pair of adjacent rows of mounting holes. The apparatus may further include sealed cooling channels adjacent to the bus bar and each additional bus bar. The bus bar may be integrated into the coldplate using vacuum brazing or ultrasonic additive manufacturing.

Abstract: A radio frequency (RF) waveguide housing includes a metal-diamond base with a first surface and a second surface opposite the first surface. The metal-diamond base includes an opening through a thickness of the metal-diamond base, and the opening includes a first side on a side of the first surface of the metal-diamond base and a second side on a side of the second surface of the metal-diamond base. The RF waveguide housing also includes an insert to be inserted in the opening and affixed to the metal-diamond base. The insert defines an interior volume within the opening of the metal-diamond base and a shape of the insert at the first side of the opening is configured to match an end of an RF waveguide coupled to the RF waveguide housing.

Abstract: An electronic device includes a semiconductor substrate and a heat sink arranged on a surface of the semiconductor substrate. The heat sink includes a plurality of metal filaments that each includes a first end joined to the surface, a second end, and a body over the surface such that the body is surrounded by a coolant medium to dissipate heat. The heat sink is not part of an electrical network.

Abstract: A multi-layer ceramic module is provided that includes an integrated temperature control and a power switch. The integrated temperature control is configured to dissipate thermal energy. The power switch is configured to couple a power source for a standard component of the multi-layer ceramic module to the integrated temperature control.

Abstract: A process for building a high-performance liquid flow-through plate is provided and includes providing a substrate formed of metal matrix composite (MMC) material, metallizing a surface of the substrate to reform the surface into a metallized surface, placing a braze foil on the metallized surface and executing a high-temperature and high-pressure bake whereby material of the braze foil diffuses into the metallized surface.

Abstract: A method for making a cold plate includes the steps of positioning a finstock structure in a cavity of a substrate; and applying a cover to the finstock structure and substrate, wherein the applying step comprises ultrasonically additive manufacturing the cover to the substrate and the finstock structure, whereby the cover joins with the substrate and the finstock structure. The resulting cold plate assembly includes a substrate having a cavity, a finstock structure within the cavity, and a cover closing the finstock structure within the cavity, the cover being integrally joined to the substrate and to the finstock structure.

Abstract: An apparatus includes a heat sink configured to receive thermal energy from one or more heat sources. The heat sink includes a local reservoir configured to hold a liquid coolant, and the heat sink is configured to pass the thermal energy into the liquid coolant in the local reservoir in order to vaporize at least some of the liquid coolant. The apparatus also includes a membrane configured to allow vaporized coolant to pass through the membrane out of the local reservoir into an ambient environment and to prevent unvaporized coolant from passing through the membrane. The membrane is thereby configured to provide passive flow control for the liquid coolant. The membrane could include a vapor-permeable and liquid-repelling membrane. The membrane can also be configured to hold the liquid coolant in the local reservoir against one or more surfaces of the heat sink.

Abstract: An apparatus includes a coldplate and a bus bar. The coldplate is configured to be thermally coupled to a structure to be cooled and to remove thermal energy from the structure. The bus bar is integrated into the coldplate and is configured to deliver power to multiple components of the structure. The apparatus may also include multiple mounting holes positioned in rows on the coldplate and configured to mechanically couple the structure to the coldplate, where one of the bus bar or an additional bus bar is integrated between each pair of adjacent rows of mounting holes. The apparatus may further include sealed cooling channels adjacent to the bus bar and each additional bus bar. The bus bar may be integrated into the coldplate using vacuum brazing or ultrasonic additive manufacturing.

Abstract: A coldplate assembly includes a plurality of leak-tight conduit modules provided between a base and a cover to couple a first manifold cavity to a second manifold cavity. Each leak-tight conduit module includes a heat conducting structure and is pre-constructed and pre-tested prior to integration into the coldplate assembly. Each leak-tight conduit module is sealed only near the ends of the module that are disposed in the respective manifold cavity.

Abstract: An apparatus includes a heat sink configured to receive thermal energy from one or more heat sources. The heat sink includes a local reservoir configured to hold a liquid coolant, and the heat sink is configured to pass the thermal energy into the liquid coolant in the local reservoir in order to vaporize at least some of the liquid coolant. The apparatus also includes a membrane configured to allow vaporized coolant to pass through the membrane out of the local reservoir into an ambient environment and to prevent unvaporized coolant from passing through the membrane. The membrane is thereby configured to provide passive flow control for the liquid coolant. The membrane could include a vapor-permeable and liquid-repelling membrane. The membrane can also be configured to hold the liquid coolant in the local reservoir against one or more surfaces of the heat sink.

Abstract: A multi-layer ceramic module is provided that includes an integrated temperature control and a power switch. The integrated temperature control is configured to dissipate thermal energy. The power switch is configured to couple a power source for a standard component of the multi-layer ceramic module to the integrated temperature control.

Abstract: An apparatus includes a printed circuit board (PCB) including a surface that has a layer of circuitry. The apparatus also includes a heat sink configured to receive heat from the PCB. The apparatus further includes a thermally-conductive post configured to remove the heat from the PCB to the heat sink via thermal conduction through a thermal path. The thermal path is substantially orthogonal to the surface of the PCB. The post includes an end configured to physically couple to the layer of circuitry.