Arbitrarily polygonal transient thermal cloaks with natural bulk materials in bilayer configurations

Liu, Yuexia; Guo, Wenliang; Han, Tiancheng

doi:10.1016/j.ijheatmasstransfer.2017.07.032

Cited by 40 publications

(19 citation statements)

References 32 publications

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“…The bilayer scheme can be extended to transient regimes by considering heat capacity and density [30][31][32]. Since invisibility is a special case of camouflage, these results may guide thermal camouflage [33][34][35][36][37][38][39][40].…”

Section: Finite-element Simulationmentioning

confidence: 99%

Theory for Invisible Thermal Sensors: Bilayer Scheme

Huang

2022

Transformation Thermotics and Extended Theories

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In this chapter, we propose a bilayer scheme with isotropic materials to design invisible thermal sensors with detecting accuracy. Therefore, the original temperature fields in the sensor and matrix can keep unchanged. By solving the linear Laplace equation with a temperature-independent thermal conductivity, we derive two groups of thermal conductivities to realize invisible thermal sensors, even considering geometrically anisotropic cases. These results can be directly extended to thermally nonlinear cases with temperature-dependent thermal conductivity, as long as the ratio between the nonlinear thermal conductivities of the sensor and matrix is a temperature-independent constant. These explorations are beneficial to temperature detection and provide insights into thermal camouflage.

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Section: Finite-element Simulationmentioning

confidence: 99%

Theory for Invisible Thermal Sensors: Bilayer Scheme

Huang

2022

Transformation Thermotics and Extended Theories

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“…3.2c and d). Different from the schemes with analytical design [13][14][15] and topological optimization [16][17][18][19], we apply the present theory of transformation complex thermotics to design thermal cloaking.…”

Section: Model Applicationmentioning

confidence: 99%

Theory for Thermal Wave Control: Transformation Complex Thermotics

Huang

2022

Transformation Thermotics and Extended Theories

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In this chapter, we develop a transformation theory for controlling wavelike temperature fields (called thermal waves herein) in conduction and advection. We first unify these two basic heat transfer modes by coining a complex thermal conductivity whose real and imaginary parts are related to conduction and advection. Consequently, the conduction-advection process supporting thermal waves is described by a complex conduction equation, thus called complex thermotics. We then propose the principle for transforming complex thermal conductivities. We further design three metamaterials to control thermal waves with cloaking, concentrating, and rotating functions. Experimental suggestions are also provided based on porous media.

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“…Xu et al [43] extended such a design to 3D problems, to achieve the first experimental manufacturing of a 3D thermal cloak. Interesting studies were performed by Chen et al, [68] Farhat et al, [69] and Liu et al, [70] who also demonstrated that thermal cloaking can be performed via an appropriate arrangement of homogeneous materials. Additionally to the mentioned experimental works with natural materials, we can also find other interesting studies on thermal cloaking that allow the cloaked object to experience the heat flow outside the cloak, [71][72][73] enabling the development of thermal sensors difficult to detect or sensors that distort very little the censored field, as possible applications.…”

Section: Transformation Thermodynamicsmentioning

confidence: 99%

A Brief Review on Thermal Metamaterials for Cloaking and Heat Flux Manipulation

2019

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Progress in material science has allowed the control of different physical fields in a manner that would be unachievable with ordinary materials. The development of engineered materials (the so‐called metamaterials) to control the conductive heat flux has revolutionized the manner of manipulating thermal energy and allowed the possibility of guiding the heat flux in ways difficult to accept for human intuition. Herein, a brief review regarding the recent progress and developments in thermal metamaterials conceived to perform several conductive heat flux manipulation tasks is provided. Deeply theoretical discussions concerning design methodologies are left a side, and the focus is made on the design and manufacturing feasibility of metamaterials for thermal cloaking and camouflage, heat flux concentration, and inversion, among other applications that lead to the next generation of thermal devices.

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Arbitrarily polygonal transient thermal cloaks with natural bulk materials in bilayer configurations

Cited by 40 publications

References 32 publications

Theory for Invisible Thermal Sensors: Bilayer Scheme

Theory for Invisible Thermal Sensors: Bilayer Scheme

Theory for Thermal Wave Control: Transformation Complex Thermotics

A Brief Review on Thermal Metamaterials for Cloaking and Heat Flux Manipulation

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