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Coupling Theory for Temperature-Dependent Thermal Conductivities: Nonlinearity Modulation and Enhancement

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Theoretical Thermotics

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Abstract

Thermal metamaterials based on core-shell structures have aroused wide research interest, e.g., thermal cloaks. However, almost all the relevant studies only discuss linear materials whose thermal conductivities are temperature-independent constants. Nonlinear materials (whose thermal conductivities depend on temperatures) have seldom been touched, which, however, are important in practical applications. This situation largely results from the lack of a theoretical framework for handling such nonlinear problems. Here we study the nonlinear responses of thermal metamaterials with a core-shell structure in two or three dimensions. By calculating the effective thermal conductivity, we derive the nonlinear modulation of a nonlinear core. Furthermore, we reveal two thermal coupling conditions, under which this nonlinear modulation can be efficiently manipulated. In particular, we reveal the phenomenon of nonlinearity enhancement. Then this theory helps us to design a kind of intelligent thermal transparency devices, which can respond to the direction of thermal fields. The theoretical results and finite-element simulations agree well with each other. This chapter not only offers a different mechanism to achieve nonlinearity modulation and enhancement in thermotics, but also suggests potential applications in thermal management including illusion.

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Authors and Affiliations

  1. Department of Physics, Fudan University, Shanghai, China

    Ji-Ping Huang

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  1. Ji-Ping Huang
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Correspondence to Ji-Ping Huang .

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Huang, JP. (2020). Coupling Theory for Temperature-Dependent Thermal Conductivities: Nonlinearity Modulation and Enhancement. In: Theoretical Thermotics. Springer, Singapore. https://doi.org/10.1007/978-981-15-2301-4_12

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  • DOI: https://doi.org/10.1007/978-981-15-2301-4_12

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-15-2300-7

  • Online ISBN: 978-981-15-2301-4

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