Heat Manipulation Using Highly Anisotropic Pitch‐Based Carbon Fiber Composites

Heat flux manipulation, using continuous and highly anisotropic pitch-based carbon fiber composites, was extensively studied. Homogeneous, highly anisotropic, and non-singular materials were developed and studied in order to protect critical regions and nullify the heat flux through the protected region. The proposed materials take advantage of the ultrahigh thermal conductivity along the fiber, as well as the small thermal conductivity of the matrix material transverse to the fibers. The sequence of fiber–matrix–fiber transverse to fiber direction in microscale constructs a highly efficient manipulation device due to the high thermal anisotropy. The results were compared to efficient multilayer homogeneous thermal cloaks. The calculated ideal temperature field and the measured one prove the efficiency of this design approach. The same philosophy can be applied in 3D space.

[1]  Jiping Huang,et al.  A bifunctional cloak using transformation media , 2010 .

[2]  Claude Amra,et al.  Transformation thermodynamics: cloaking and concentrating heat flux. , 2012, Optics express.

[3]  S. Cummer,et al.  One path to acoustic cloaking , 2007 .

[4]  Yuki Sato,et al.  Heat flux manipulation with engineered thermal materials. , 2012, Physical review letters.

[5]  Tsuyoshi Nomura,et al.  Heat flux cloaking, focusing, and reversal in ultra-thin composites considering conduction-convection effects , 2013 .

[6]  A transient thermal cloak experimentally realized through a rescaled diffusion equation with anisotropic thermal diffusivity , 2013 .

[7]  Run Hu,et al.  Local heating realization by reverse thermal cloak , 2014, Scientific Reports.

[8]  V. Kostopoulos,et al.  Prediction and experimental validation of the electrical conductivity of dry carbon fiber unidirectional layers , 2011 .

[9]  M. Wegener,et al.  Experiments on transformation thermodynamics: molding the flow of heat. , 2012, Physical review letters.

[10]  N. Athanasopoulos,et al.  Damage detection via Joule effect for multidirectional carbon fiber reinforced composites , 2012 .

[11]  David R. Smith,et al.  Controlling Electromagnetic Fields , 2006, Science.

[12]  Cheng-Wei Qiu,et al.  Homogeneous Thermal Cloak with Constant Conductivity and Tunable Heat Localization , 2013, Scientific Reports.

[13]  Huanyang Chen,et al.  Acoustic cloaking in three dimensions using acoustic metamaterials , 2007 .

[14]  V. Kostopoulos,et al.  Resistive heating of multidirectional and unidirectional dry carbon fibre preforms , 2012 .

[15]  V. Kostopoulos,et al.  A comprehensive study on the equivalent electrical conductivity tensor validity for thin multidirectional carbon fibre reinforced plastics , 2014 .

[16]  N. Tsopelas,et al.  Experimental evaluation of electromagnetic-thermal non-destructive inspection by eddy current thermography in square aluminum plates , 2011 .

[17]  Yuki Sato,et al.  Transient heat flux shielding using thermal metamaterials , 2013, 1305.3197.

[18]  N. Tsopelas,et al.  Improvements in electromagnetic-thermal non-destructive inspection by data processing , 2009 .

[19]  U. Leonhardt.  Optical Conformal Mapping , 2006, Science.

[20]  Zheng-Mao Wu,et al.  Three-Dimensional Thermal Cloak with Homogeneous and Nonsingular Conductive Materials , 2013 .