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Thermal invisible cloak for thermal radiation

A heat radiation and cloak technology, applied in the field of thermodynamics, can solve the problem that heat radiation cannot be ignored, and achieve the effect of simple structure and parameters

Active Publication Date: 2019-12-24
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, the original thermal invisibility cloak based on pure heat conduction is no longer applicable under high temperature conditions, because the effect of thermal radiation has become non-negligible, and the thermal radiation must be regulated

Method used

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  • Thermal invisible cloak for thermal radiation
  • Thermal invisible cloak for thermal radiation
  • Thermal invisible cloak for thermal radiation

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with specific examples and accompanying drawings, but the present invention is not limited thereto.

[0028] figure 1 A schematic showing the thermal invisibility cloak. By designing the parameters of the shell layer through the formulas (1) and (2) to match the parameters of the background, the function of the thermal invisibility cloak can be realized. At the same time, the invention can also deal with the geometrically anisotropic ellipsoid / ellipse problem, but only requires the core-shell structure to be confocal (concentric for a circular core-shell structure). For non-confocal (non-concentric) configurations, the invention also works, but the effect obtained is an approximate result.

[0029] figure 2A steady-state simulation of the thermal invisibility cloak is shown in . The simulation uses the commercial software COMSOLMULTIPHYSICS. According to the Steffen-Boltzmann law, the radiation...

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Abstract

The invention belongs to the technical field of thermodynamics, and particularly relates to a thermal invisible cloak for thermal radiation. The thermal invisible cloak is of a shell layer structure,and objects in a shell layer cannot be found by infrared detection outside the shell layer as if objects in the middle do not exist; according to the method, Rosseland diffusion is used for approximately processing the heat radiation problem, and the heat conduction part is still described by the traditional Fourier law. The thermal invisibility cloak is composed of a heat insulation layer and a compensation layer, and by designing the Rosseland average extinction coefficient and the heat conductivity of the compensation layer, the thermal invisibility effect under the room temperature condition and the high temperature condition can be achieved at the same time. Through theoretical analysis and finite element simulation verification, the method can be applied to the fields of thermal radiation protection and the like.

Description

technical field [0001] The invention belongs to the technical field of thermodynamics, in particular to a thermal invisibility cloak aimed at thermal radiation. Background technique [0002] Thermal invisibility cloak is of great significance in the field of thermal protection. This device can protect objects in the middle from being detected by external infrared detection. Existing thermal cloaks are designed based on Fourier's law of heat conduction. However, in addition to heat conduction, there are two other ways of heat energy transport: heat convection and heat radiation. Especially under high temperature conditions, according to the Steffen-Boltzmann law, the power density increases with the fourth power of the temperature. Therefore, the original thermal invisibility cloak based on pure heat conduction is no longer applicable under high temperature conditions, because the effect of thermal radiation has become non-negligible, and the thermal radiation must be regul...

Claims

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Application Information

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IPC IPC(8): G06F17/50A41D3/08
CPCA41D3/08
Inventor 黄吉平须留钧
Owner FUDAN UNIV
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