Thermoelectric dual-field dual-function device and design method
By designing a thermoelectric dual-field dual-function device and using the neutral inclusion principle to determine material parameters, the device achieves accurate detection and stealth capabilities of metamaterials under both thermal and electric fields. This solves the problem of single-function devices in existing technologies and broadens the scope of application.
Patent Information
- Application Number
- CN202111510743.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-11
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2041-12-11
AI Technical Summary
Existing metamaterial devices are mostly single-function devices, unable to accurately detect multi-physics fields, and unable to achieve stealth functionality under multi-physics fields.
Design a thermoelectric dual-field dual-function device, including a core region, a first shell and a second shell. The material parameters of each layer are determined by the principle of neutral inclusion to achieve accurate detection and stealth functions under thermal and electric fields. The temperature and potential distribution of the core region are consistent with those of the background matrix and are not disturbed.
It enables precise detection and stealth under both thermal and electric fields, ensuring that temperature and potential distribution are not affected by the device, thus broadening the device's applicability and allowing for flexible switching of functions as needed.
Smart Images
Figure CN114372389B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of metamaterials, in particular to a thermoelectric dual-field dual-function device and a design method. BACKGROUND
[0002] Metamaterials are a special material structure design idea, which can realize some functions that ordinary materials do not have, such as stealth function, aggregation function, illusion function, detection function, etc. Therefore, they are widely used to control electromagnetic field, sound field, thermal field, light field and other physical fields.
[0003] At present, most of the various functional devices realized by metamaterials can only realize single control function, and lack of design and implementation of dual-function devices. In addition, the existing detectors cannot accurately present the physical field in the background matrix, and most of them are only suitable for a single physical field, lacking response to multiple physical fields. SUMMARY
[0004] The purpose of the present application is to overcome the defects of the prior art and provide a thermoelectric dual-field dual-function device and a design method.
[0005] The purpose of the present application can be achieved by the following technical solutions:
[0006] A thermoelectric dual-field dual-function device, characterized in that it comprises a core region, a first layer shell and a second layer shell designed from the inside to the outside, wherein the core region is used to realize the multiple functions of the device in a certain background matrix under the thermal field and the electric field, including accurate detection under the thermal field and the electric field, stealth under the thermal field and the electric field, accurate detection under the thermal field and stealth under the electric field, and stealth under the thermal field and accurate detection under the electric field,
[0007] The accurate detection refers to that the temperature and electric potential distribution of the core region is exactly the same as the temperature and electric potential distribution in the background matrix, and the temperature and electric potential distribution in the background matrix is not disturbed by the existence of the functional device,
[0008] The stealth function refers to that the temperature and electric potential distribution of the core region is a constant value, and the temperature and electric potential gradient tends to zero, and the temperature and electric potential distribution in the background matrix is not disturbed by the existence of the functional device.
[0009] Preferably, the core region, the first layer shell, the second layer shell and the background matrix are each isotropic materials, and the thermal conductivities are κ1, κ2, κ3 and κ4 in turn, and the electrical conductivities are σ1, σ2, σ3 and σ4 in turn.
[0010] Preferably, κ1≠κ2≠κ3, σ1≠σ2≠σ3, and κ1<κ4, σ1<σ4.
[0011] Preferably, the geometric centers of the core region, the first layer shell and the second layer shell coincide.
[0012] A design method of the thermoelectric dual-field dual-function device, the method comprising:
[0013] Determining the geometric parameters of the core region, the first layer shell and the second layer shell;
[0014] Determining the material parameters of the core region and the background matrix;
[0015] Solving the material parameters of the first layer shell and the second layer shell according to the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix by using the neutral inclusion principle.
[0016] Preferably, when the core region needs to realize accurate detection, the thermal conductivity and the electrical conductivity of the first layer shell and the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0017] Preferably, when the core region needs to realize the stealth function, the first layer shell is set to be an insulating material, and the thermal conductivity and the electrical conductivity of the first layer shell and the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0018] Preferably, when the core region needs to realize the stealth function under the thermoelectric dual field, the first layer shell is set to be a thermoelectric insulating material, and the thermal conductivity and the electrical conductivity of the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0019] Preferably, when the core region needs to realize accurate detection under the thermal field and the stealth function under the electric field, the first layer shell is set to be an electric insulating material, and the thermal conductivity of the first layer shell, the thermal conductivity and the electrical conductivity of the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0020] Preferably, when the core region needs to realize the stealth under the thermal field and the accurate detection under the electric field, the first layer shell is set to be a thermal insulating material, and the electrical conductivity of the first layer shell, the thermal conductivity and the electrical conductivity of the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0021] Compared with the prior art, the present application has the following advantages:
[0022] (1) The present invention designs a dual-function device (precise detection and stealth function) that is applicable to both thermal and electric fields. The precise detection function can accurately detect the temperature and electric potential in the background environment (background matrix) without disturbing the distribution of the external temperature and electric fields. The thermoelectric stealth function of the present invention can prevent external heat flow and current from entering the area to be protected, so that the temperature and electric potential of the area to be protected are a constant value (i.e. the temperature and electric potential gradients approach zero) and will not disturb the distribution of the external temperature and electric fields.
[0023] (2) This invention can flexibly adjust the functions of the thermal field and electric field according to actual needs. For example, it can achieve precise detection of thermal and electric fields, precise detection of thermal fields while concealing them in electric fields, precise detection of electric fields while concealing them in thermal fields, and the function of concealing both thermal and electric fields, thereby broadening the application scope of the device of this invention. Attached Figure Description
[0024] Figure 1 This is a geometric model diagram of the dual-function thermal and electric field device of the present invention;
[0025] Figure 2 This is a thermal and electric field distribution diagram of the thermoelectric dual-function device in Example 1;
[0026] Figure 3 This is a thermal and electric field distribution diagram of the thermoelectric dual-function device in Example 2;
[0027] Figure 4 This is a thermal and electric field distribution diagram of the thermoelectric dual-function device in Example 3;
[0028] Figure 5 This is a thermal and electric field distribution diagram of the thermoelectric dual-function device in Example 4;
[0029] In the diagram, 1 represents the core area, 2 represents the first shell, and 3 represents the second shell. Detailed Implementation
[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Note that the following description of the embodiments is merely illustrative and is not intended to limit its applicability or use, nor is the present invention limited to the following embodiments.
[0031] like Figure 1 As shown, this invention provides a thermoelectric dual-field dual-function device, comprising a core region designed from the inside out, a first shell, and a second shell. The core region is used to realize multiple functions of the device under thermal and electric fields in a certain background matrix, including accurate detection under both thermal and electric fields, stealth under both thermal and electric fields, accurate detection under thermal field and stealth under electric field, and stealth under thermal field and accurate detection under electric field.
[0032] The precise detection refers to that the temperature and potential distribution of the core region and the temperature and potential distribution of the background matrix are completely the same, and the temperature and potential distribution of the background matrix is not disturbed by the existence of the functional device; and the stealth function refers to that the temperature and potential distribution of the core region is a constant value, the temperature and potential gradient tends to zero, and the temperature and potential distribution of the background matrix is not disturbed by the existence of the functional device.
[0033] The thermal conductivity and the electrical conductivity of the background matrix are κ4 and σ4 respectively, the core region, the first layer shell and the second layer shell are isotropic materials respectively, the thermal conductivities are κ1, κ2 and κ3 in sequence, the electrical conductivities are σ1, σ2 and σ3 in sequence, κ1≠κ2≠κ3, σ1≠σ2≠σ3, and κ1<κ4, σ1<σ4.
[0034] The geometric centers of the core region, the first layer shell and the second layer shell are coincident.
[0035] The design method of the above-mentioned thermoelectric double-field double-function device, the method comprises:
[0036] The geometric parameters of the core region, the first layer shell and the second layer shell are determined;
[0037] The material parameters of the core region and the background matrix are determined;
[0038] The material parameters of the first layer shell and the second layer shell are solved according to the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix by using the neutral inclusion principle.
[0039] When the core region needs to realize the precise detection, the thermal conductivities and the electrical conductivities of the first layer shell and the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0040] When the core region needs to realize the stealth function, the first layer shell is set to be an insulating material, and the thermal conductivities and the electrical conductivities of the first layer shell and the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0041] When the core region needs to realize the stealth function under the thermoelectric double field, the first layer shell is set to be a thermoelectric insulating material, and the thermal conductivities and the electrical conductivities of the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0042] When the core region needs to realize the precise detection under the thermal field and the stealth function under the electric field, the first layer shell is set to be an electric insulating material, and the thermal conductivity of the first layer shell, the thermal conductivities and the electrical conductivities of the second layer shell are solved based on the geometric parameters of the core region, the first layer shell and the second layer shell and the material parameters of the core region and the background matrix.
[0043] When the core region needs to achieve the function of stealth in thermal field and accurate detection in electric field, the first shell is set as thermal insulation material. Based on the geometric parameters of the core region, the first shell and the second shell, and the material parameters of the core region and the background matrix, the electrical conductivity of the first shell and the thermal conductivity and electrical conductivity of the second shell are solved.
[0044] The geometric shape of the functional device can be designed as needed. In the following four specific embodiments, the geometric shape of the functional device is designed as a cylindrical shape, i.e., the core region is a cylindrical shape with a radius of r1, and the first shell and the second shell are cylindrical rings with radii of r2 and r3, respectively. Specifically, the geometric radii of the core region, the first shell and the second shell are 3 cm, 4 cm and 5 cm, respectively. The materials of the core region and the background matrix are taken as 436 stainless steel [30 (W / (m﹒K)), 1.43E6 (S / m)] and magnesium alloy [72.7 (W / (m﹒K)), 6.99E6 (S / m)]. It should be noted that the geometric radii of the core region, the first shell and the second shell can be arbitrary, and the selection of the materials of the core region and the background matrix is also arbitrary, as long as the thermal conductivity and electrical conductivity of the material of the core region are less than those of the background matrix. The left and right boundary conditions of the background matrix are set as 293.15 K (5 V) and 273.15 K (0 V), and the upper and lower boundaries are thermoelectric insulation boundaries. Next, four different thermoelectric dual-field dual-function devices will be analyzed.
[0045] Example 1
[0046] To achieve the function of accurate detection in thermal field and electric field, after the geometric radii of the core region, the first shell and the second shell and the material parameters of the core region and the background matrix are known, the thermal conductivities of the first shell and the second shell are 263 (W / (m﹒K)) and 43 (W / (m﹒K)), respectively, and the electrical conductivities are 3.07E7 (S / m) and 4.02E6 (S / m), respectively. The finite element simulation results are shown in Figure 2 , Figure 2 Fig. (a) is a thermal field distribution map, and Fig. (b) is an electric field distribution map. Analysis shows that the temperature potential distribution of the core region is the same as that of the background matrix, and the temperature gradient is 100 K / m, and the potential gradient is 25 V / m, thereby ensuring the function of accurate detection in thermoelectric dual field.
[0047] Example 2
[0048] To achieve the function of stealth in thermal field and electric field, the first shell needs to be set as a thermal and electric insulation material. Similarly, after the geometric radii of the core region, the first shell and the second shell and the material parameters of the core region, the first shell and the background matrix are known, the thermal conductivity of the second shell is 329 (W / (m﹒K)), and the electrical conductivity is 3.19E7 (S / m). The finite element simulation results are shown in Figure 3 , Figure 3Fig. 1 shows the simulation results of the thermal field and electric field in the core region and the background matrix. Fig. 1(a) is a thermal field distribution map, and Fig. 1(b) is an electric field distribution map. Analysis shows that the isotherm and the equipotential line bypass the core region, so that the core region is free from the thermal flow and the electric current (the temperature potential gradient of the core region tends to zero), thereby ensuring the function of thermal-electric dual-field stealth.
[0049] Example 3
[0050] In order to realize the function of electric field accurate detection thermal field stealth, the first shell needs to be set as a thermal insulation material. After the geometric radius of the first shell and the second shell and the material parameters of the core region and the background matrix are known, the electric field material parameters of the first shell and the second shell can be solved as 3.07E7 (S / m) and 4.02E6 (S / m) respectively. Then the thermal field material parameter of the second shell is solved as 329 (W / (m﹒K)) separately. The finite element simulation results are shown in Fig. 2. Figure 4 , Figure 4 Fig. 2 shows the simulation results of the thermal field and electric field in the core region and the background matrix. Fig. 2(a) is a thermal field distribution map, and Fig. 2(b) is an electric field distribution map. Analysis shows that the potential distribution of the core region is completely the same as that of the background matrix (both are 25 V / m), and the temperature gradient of the core region tends to zero, thereby ensuring the function of electric field accurate detection thermal field stealth.
[0051] Example 4
[0052] In order to realize the function of thermal field accurate detection electric field stealth, the first shell needs to be set as an electric insulation material. After the geometric radius of the first shell and the second shell and the material parameters of the core region and the background matrix are known, the thermal field material parameters of the first shell and the second shell can be solved as 263 (W / (m﹒K)) and 43 (W / (m﹒K)) respectively. Then the electric field material parameter of the second shell is solved as 3.19E7 (S / m) separately. The finite element simulation results are shown in Fig. 3. Figure 5 , Figure 5 Fig. 3 shows the simulation results of the thermal field and electric field in the core region and the background matrix. Fig. 3(a) is a thermal field distribution map, and Fig. 3(b) is an electric field distribution map. Analysis shows that the temperature distribution of the core region is completely the same as that of the background matrix (both are 100 K / m), and the potential gradient of the core region tends to zero, thereby ensuring the function of thermal field accurate detection electric field stealth.
[0053] The above four examples describe four different thermal field and electric field detection and stealth functions, and the devices corresponding to the four examples have the same geometric shape and the same material parameters of the core region and the background matrix. That is, the present application only needs to reasonably design the material parameters of the first shell and the second shell, so as to realize the switching of the above four different thermal-electric dual-field dual-function.
[0054] The above-described embodiments are merely exemplary and do not represent the limitation of the scope of the present application. These embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the scope of the technical idea of the present application.
Claims
1. A thermoelectric dual-field dual-function device, characterized in that, The core region, the first shell and the second shell are designed from inside to outside, the core region is used to realize multiple functions of a device in a certain background matrix under thermal field and electric field, including accurate detection under thermal field and electric field, invisibility under thermal field and electric field, accurate detection under thermal field and invisibility under electric field, accurate detection under thermal field and invisibility under electric field, The accurate detection means that the temperature and electric potential distribution of the core region is completely the same as the temperature and electric potential distribution in the background matrix, and the temperature and electric potential distribution in the background matrix is not disturbed by the existence of the functional device, The invisibility function means that the temperature and electric potential distribution of the core region is a constant value, and the temperature and electric potential gradient tends to zero, and the temperature and electric potential distribution in the background matrix is not disturbed by the existence of the functional device; The core region, the first shell, the second shell and the background matrix are all isotropic materials, and the thermal conductivities are κ1, κ2, κ3 and κ4 in turn, and the electric conductivities are σ1, σ2, σ3 and σ4 in turn; κ1≠κ2≠κ3, σ1≠σ2≠σ3, and κ1<κ4, σ1<σ4; The geometric centers of the core region, the first shell and the second shell coincide.
2. A method of designing a thermoelectric dual-field dual-function device according to any one of claims 1, characterized in that, The method comprises: determining the geometric parameters of the core region, the first shell and the second shell; determining the material parameters of the core region and the background matrix; using the neutral inclusion principle, the material parameters of the first shell and the second shell are solved according to the geometric parameters of the core region, the first shell and the second shell, and the material parameters of the core region and the background matrix; when the core region needs to realize accurate detection, the thermal conductivities and the electric conductivities of the first shell and the second shell are solved based on the geometric parameters of the core region, the first shell and the second shell, and the material parameters of the core region and the background matrix; when the core region needs to realize invisibility function, the first shell is set to be an insulating material, and the thermal conductivities and the electric conductivities of the first shell and the second shell are solved based on the geometric parameters of the core region, the first shell and the second shell, and the material parameters of the core region and the background matrix; when the core region needs to realize invisibility function under thermal and electric fields, the first shell is set to be a thermal and electric insulating material, and the thermal conductivity and the electric conductivity of the second shell are solved based on the geometric parameters of the core region, the first shell and the second shell, and the material parameters of the core region and the background matrix; when the core region needs to realize accurate detection under thermal field and invisibility under electric field, the first shell is set to be an electric insulating material, and the thermal conductivity of the first shell, the thermal conductivity and the electric conductivity of the second shell are solved based on the geometric parameters of the core region, the first shell and the second shell, and the material parameters of the core region and the background matrix; when the core region needs to realize invisibility under thermal field and accurate detection under electric field, the first shell is set to be a thermal insulating material, and the electric conductivity of the first shell, the thermal conductivity and the electric conductivity of the second shell are solved based on the geometric parameters of the core region, the first shell and the second shell, and the material parameters of the core region and the background matrix.