Thermal Invisibility Through Geometrical
Transformation: A Segmented Cloaking
Approach
Author(s)
E. H. Ooi & V. Popov
Abstract
Thermal invisibility through geometrical transformation can be achieved;
however, the required materials would be inhomogeneous and thermally
anisotropic. The difficulty in manufacturing materials that are inhomogeneous
and thermally anisotropic in the desired way, has been a major obstacle in the
fabrication of a thermal cloaking device. In this study, the potential of using
segmented cloaking to mimic the inhomogeneous and thermally anisotropic
properties to achieve thermal invisibility is explored. Segmented cloaking
involves the use of a multi-layered structure – each layer defined by
homogeneous and thermally isotropic materials – to replace the inhomogeneous
and anisotropic material. This reduces the requirements on the materials used in
the fabrication of a thermal cloaking device. The effectiveness of the segmented
thermal cloak is examined numerically and the effects of the number of segments
used and the thickness ratio of the segments on the level of thermal invisibility
achieved are investigated.
Keywords: segmented thermal cloaking, coordinate transformation, thermal
resistance, homogeneous and isotropic, thermal conductivity.
1 Introduction
Pendry et al. [1] demonstrated that invisibility from an electromagnetic field can
be achieved by bending the trajectory of the electromagnetic waves around a
given object. The diversion of the electromagnetic waves is carried out
mathematically through a linear geometrical transformation, which in practice,
leads to the use of inhomogeneous and anisotropic materials as the cloaking
Keywords
segmented thermal cloaking, coordinate transformation, thermal
resistance, homogeneous and isotropic, thermal conductivity.
Related Book
Other papers in this volume
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