Thermal Spreading Resistance Inside Anisotropic Plates with Arbitrarily Located Hotspots

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Abstract
Graphite-based anisotropic materials are becoming the key component of next-generation cooling systems in electronics and telecommunication industries. Proper use of these materials in the form of thermal spreaders, compared to conventional metallic ones, can significantly reduce the thermal stress and thermal resistance in the system. In this study, a new analytical model for temperature distribution inside anisotropic rectangular plates subjected to multiple sources and sinks on the top and bottom surfaces is presented. All lateral faces are assumed insulated. The solution is first justified for the case with single hotspots on each side and then using the superposition principle, it is extended into the general form to cover multihotspot cases. The model is validated by numerical simulation data and a perfect agreement is observed. Thermal spreading resistance is defined for the anisotropic plate and a comprehensive parametric study for optimization purpose is performed. The influence of both anisotrop...

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