Guiding conductive heat flux through thermal metamaterials

Experimental evidence of the bending of heat to desired purpose, in analogy to that of light, through designed placement and orientation of nominally isotropic material is presented. This was done by inducing anisotropy in an effective thermal medium through off-diagonal components in the thermal co...

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Bibliographic Details
Published in:Applied physics letters 2014-11, Vol.105 (19)
Main Authors: Vemuri, K. P., Canbazoglu, F. M., Bandaru, P. R.
Format: Article
Language:English
Subjects:
Anisotropy
Applied physics
Heat flux
Heat transfer
Heat transmission
Isotropic material
Mathematical analysis
Metamaterials
Tensors
Thermal conductivity
Thermal diffusivity
Thin films
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Summary:Experimental evidence of the bending of heat to desired purpose, in analogy to that of light, through designed placement and orientation of nominally isotropic material is presented. This was done by inducing anisotropy in an effective thermal medium through off-diagonal components in the thermal conductivity tensor. An upward or downward heat flux bending of up to ± 26°, in close agreement with theoretical estimates, was obtained in a metamaterial constituted from thin, stacked layers of copper and stainless steel. Transient observations of heat flow indicate anisotropic energy transport hinging on the relative differences between the elements of the thermal diffusivity tensor.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4901885