Design And Analysis Of Thermal Functional Devices Based On The Thermal Metamaterial

Thermal metamaterial can control the heat flux direction according to the requirements,so it has wide application prospects in the fields of efficient utilization of thermal energy,heat dissipation of electronic devices,thermal information management and so on.However,most the existing work on thermal metamaterials focus on unifunctional cloaks,and without the overall performance evaluation.In view of the above problems,this thesis puts forward three thermal functional devices based on the thermal metamaterial.Here,we propose the rotated thermal cloak which has dual thermal functions.The thermal conductivity parameters are derived by the dual coordinate transformation.The simulations are also discussed by validating the concept and effect.The proposed rotated thermal cloak is expected to realize the cloaking effect when the rotation angle is zero,and realize the while-rotating–while-cloaking effect when the rotation angle is non-zero.We propose the overall performance evaluation of the elliptical thermal cloaks.Building the structural model and thermodynamic mode with different parameters.Using entropy generation approach and entransy dissipation approach to evaluate the performance of the thermal metamaterial.The results show that both entropy generation and entransy dissipation can be used as evaluation and optimizing index.We propose the thermal encoding device based on the thermal energy shielding and harvesting units.Simulations reveal that such thermal encoding can be used in one dimension and two dimensions.The dismountable thermal coding devices are fabricated by the Effective Medium Theory.The experiments results show that such thermal encoding can be encrypted dependent on the communication protocol.