Thermal phantom adjusting and control method based on porous medium

A porous medium and thermal magic technology, applied in the field of thermal science, to solve the problems of singularity and non-uniformity, with the effect of feasibility and practical applicability

Active Publication Date: 2019-11-08
FUDAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a thermal phantom control method that has a simple structure and can effectively solve the problems of material singularity and non-uniformity

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  • Thermal phantom adjusting and control method based on porous medium
  • Thermal phantom adjusting and control method based on porous medium
  • Thermal phantom adjusting and control method based on porous medium

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with specific embodiments and drawings, but the present invention is not limited thereto. The size of the system in this embodiment has a side length of 10 -5 m level, the temperature difference is 40K, the pressure difference is 400Pa, and the fluid velocity is controlled at 10 -3 -10 -2 m / s magnitude. The fluid is chosen as water with a density of 10 3 kg / m 3 , with a heat capacity of 4.2×10 3 J·kg -1 K -1 , with a viscosity of 10 -3 Pa·s, thermal conductivity is 0.6Wm -1 K -1 . Porous media has a permeability of 10 -12 m 2 order of magnitude. The system is in steady state.

[0046] figure 1 The left and right are schematic diagrams of the structures where the applied temperature field and pressure field are perpendicular or parallel to each other, respectively. The temperature field is in the x direction. This method considers that the fluid is incompressible, and the fluid densit...

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Abstract

The invention belongs to the technical field of thermology, and in particular relates to a thermal phantom adjusting and control method based on a porous medium. In combination with a Fourier law anda Darcy law, the method in the invention is used for describing heat conduction and heat convection processes; by utilization of the equation formal consistency of the heat conductivity and the permeability in a steady state condition, the expression of the equivalent permeability is obtained based on an efficient media theory; then, heat convective diffusion is generated by establishing a pressure field and a temperature field; a simple core-shell structure is utilized; three thermal phantom functions including heat transparent, heat accumulation and heat invisible cloak can be realized by adjusting and controlling the radial and tangential values of the permeability and the heat conductivity of a shell; and simultaneously, distribution of the temperature field and a heat flow field before the background is not changed. Compared with other thermal phantom adjusting and control methods in the heat convective diffusion process, the method in the invention is simple in structure and relatively flexible and feasible; furthermore, the singularity and the uniformity of a material are solved; and thus, the method in the invention has better practical application.

Description

technical field [0001] The invention belongs to the field of thermal technology, and in particular relates to a thermal phantom control method based on a thermal convection diffusion process of a porous medium. Background technique [0002] Since 2008, transformation heat has been widely studied by people, and has achieved great breakthroughs and rich results in the process of heat conduction. Many metamaterials and novel devices have been designed and realized theoretically and experimentally, such as thermal cloaks, thermal aggregation and thermal rotation functional devices, and so on. Transformation theory provides a powerful method for macroscopic thermal regulation. However, the materials designed by the transformation theory have singularity and non-uniformity, such as the thermal invisibility cloak, which requires a radial thermal conductivity of 0. These materials do not exist in nature. In order to solve this problem, people use the effective medium theory and mul...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/00G01N13/04
CPCG01N13/00G01N13/04G01N2013/003
Inventor 黄吉平杨福宝须留钧
Owner FUDAN UNIV
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