Abstract:
In apparatus for heat exchange to and from a body surface using a heat transfer liquid a heat exchanger comprises a plurality of elements (30) within a casing (10) connected axially against one another with spacer tube elements. Each element (30) has its periphery spaced from the body surface to provide a flow gap (50) for heat transfer fluid in heat exchange contact with the surface. The element (30) have plenums (41, 42) separating each from one another forming connecting flow spaces (36, 37) for the heat transfer liquid between the heat transfer flow gap and inlet and outlet passages (38, 39) passing through the body. A preferred apparatus is a cylindrical rotor (16) within a cylindrical stator (10) with an annular processing space (20) between them, the rotor containing a stack of heat exchange elements (30) of the respective shape permitting high heat flux rates and uniform temperature distribution over the total rotor heat transfer surface.
Abstract:
Methods and apparatus for high shear reacting and/or mixing of moving fluid streams of materials employ an interdiffusing and reacting zone formed in the space between two stationary surfaces (30, 32), the surfaces being spaced (22, 22B) apart a maximum distance of the sum of the thicknesses of the back-to-back boundary layers of the materials and/or resulting materials on the surfaces, to a value such that any third layer between the two boundary layers is too thin to support agitation characterized by turbulent convection and/or to cause channeling. The materials are interdiffused by high speed laminar shear produced by the flow of the materials rather than mixed by macroscopic convection, the materials being driven by high velocity inlet feeds (24, 26), auxiliary high pressure gas flow pumped into the reaction/mixing zone, or auxiliary high-pressure gas flow created as an evolving gaseous by product of any chemical reaction that may occur.
Abstract:
Highly filled composite materials, e.g. comprising approximately 60 volume % or greater of finely powdered particles of filler in a polymer matrix, are made by dissolving polymer in a volatilisable solvent, adding filler and forming a homogeneous mixture by high shear mixing. Most solvent is then removed while maintaining homogeneity in the mixture, preferably by evaporation in a high shear mill. Then, extruding a thin layer of the composite material and removing remaining solvent, as by heating. Bodies are formed from the dried layer, which are heated and pressed to melt and disperse melted polymer into the interstices between filler particles. Thereby, certain polymers unusable at low solids contents become effective bonding materials at high solids contents. Filler materials are chosen to tailor electrical and physical properties of the articles, which may comprise substrates for electronic circuits. Suitable polymers are certain polyarylene ethers soluble in cyclohexanone.
Abstract:
Methods and apparatus for high shear reacting and/or mixing of moving fluid streams of materials employ an interdiffusing and reacting zone formed in the space between two stationary surfaces (30, 32), the surfaces being spaced (22, 22B) apart a maximum distance of the sum of the thicknesses of the back-to-back boundary layers of the materials and/or resulting materials on the surfaces, to a value such that any third layer between the two boundary layers is too thin to support agitation characterized by turbulent convection and/or to cause channeling. The materials are interdiffused by high speed laminar shear produced by the flow of the materials rather than mixed by macroscopic convection, the materials being driven by high velocity inlet feeds (24, 26), auxiliary high pressure gas flow pumped into the reaction/mixing zone, or auxiliary high-pressure gas flow created as an evolving gaseous by product of any chemical reaction that may occur.
Abstract:
Composite materials comprising at least 60 volume %, preferably 70 volume %, of particles of finely powdered filler material in a matrix of poly(arylene ether) polymer material are made by forming a mixture of the components, forming the required bodies therefrom, and then heating and pressing the bodies to a temperature sufficient to melt the polymer and to a pressure sufficient to disperse the melted polymer into the interstices between the filler particles. Surprisingly these polymer materials can only be effective as bonding materials when the solids content is as high as that specified, since with lower contents the resultant bodies are too friable. This is completely contrary to accepted prior art practice which considers that composites are progressivly weakened as the solids content is increased, so that such content must be limited. In processes to obtain as complete a dispersion of the components as possible they are individually dispersed in a liquid dispersion medium containing the polymer together with necessary additives, each mixture being ground if required to obtain a desired particle size, the mixtures are mixed, again ground to produce thorough dispersion, are separated from the liquid dispersion medium and green articles formed from the resulting pasty mixture. The green articles are then heated and pressed as described above. Mixtures of different filler materials may be used to tailor the electrical and physical properties of the final materials. The articles preferably comprise substrates for use in electronic circuits.
Abstract:
Un método para procesado de materiales que comprende: hacer pasar los materiales a procesar en una trayectoria de flujo a través de un pasaje de procesado anular entre dos superficies suaves espaciadas próximas provistas con miembros interno y externo respectivos de un aparato cilíndrico, al menos uno de los cuales rota respecto al otro, estando los materiales esencialmente libres de vórtices de Taylor; e irradiar los materiales en el pasaje de procesado con una energía de procesado que pasa a través de una ventana del miembro externo, en el que la altura del pasaje de procesado anular es menor que la profundidad de penetración de la energía de procesado hacia los materiales a procesar.
Abstract:
A window allows the introduction of radiation energy into an annular processing chamber (44) filled with a material to be processed. The chamber is formed from coaxial cylinder members (30,32) rapidly rotating relative to one another. The chamber (44) can be thin enough so that it is short compared to the penetration depth of the radiation through the material, providing even exposure of the material to the radiation. Also, eddies created in the material by the relative rotation enhances the even exposure. When the material inside the annular processing chamber (44) is opaque, resulting in an insignificant penetration depth, the eddies still insure that the material is evenly exposed to the irradiation.
Abstract:
A window allows the introduction of radiation energy into an annular processing chamber (44) filled with a material to be processed. The chamber is formed from coaxial cylinder members (30,32) rapidly rotating relative to one another. The chamber (44) can be thin enough so that it is short compared to the penetration depth of the radiation through the material, providing even exposure of the material to the radiation. Also, eddies created in the material by the relative rotation enhances the even exposure. When the material inside the annular processing chamber (44) is opaque, resulting in an insignificant penetration depth, the eddies still insure that the material is evenly exposed to the irradiation.
Abstract:
Methods and apparatus for processing materials employ two cylindrical members, one mounted within the other, defining an annular processing chamber. Preferably, the outer member is stationery (stator), while the inner rotates (rotor). The radial spacing between the stator inner surface and the rotor outer surface is equal to or less than the back-to-back radial thicknesses of the two laminar boundary layers formed on the two surfaces by the material being processed. The surfaces are made smooth, as by buffing to a finish of not more than 10 microinches. This structure inhibits formation of Taylor vortices in the processing passage, which cause unstable flow and consequent incomplete mixing. Preferably, the relative velocity between rotor and stator surfaces is at least 1.2 meters per second. The surfaces may be coated with catalysts. Transducers may be provided to apply processing energy, such as microwave, light or ultrasonic waves, through the stator wall.