Thermal Spreading Resistance in Compound and Orthotropic Systems

Ar eview of thermal spreading resistances in compound and orthotropic systems is presented. Solutions for thermal spreading resistances in compound systems are reported. Solutions are reported for both cylindrical and rectangular systems, variable flux distributions, and edge cooling. Transformations of the governing equations and boundary conditions for orthotropic systems are discussed, and new solutions are obtained for rectangular flux channels and circular flux tubes. Nomenclature Ab = baseplate area, m 2 Am, An, Amn, Bn =F ourier coefficients As = heat source area, m 2 a, b

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