多孔泡沫热电器件断裂及其对能量转化性能的影响规律研究

崔有江; 王保林; 王开发

doi:10.21656/1000-0887.440147

多孔泡沫热电器件断裂及其对能量转化性能的影响规律研究

doi: 10.21656/1000-0887.440147

1.
东莞理工学院交叉科学研究中心，广东东莞 523808
2.
哈尔滨工业大学(深圳) 理学院，广东深圳 518055

基金项目:

国家自然科学基金项目 12102104

国家自然科学基金项目 11972137

广东省基础与应用基础研究基金 2022A1515240072

广东省基础与应用基础研究基金 2022B1515020099

广东省基础与应用基础研究基金 2022A1515010801

详细信息

作者简介:
崔有江(1990—)，男，副研究员，博士(E-mail: cuiyoujiang@dgut.edu.cn)

通讯作者:
王保林(1968—)，男，教授，博士，博士生导师(通讯作者. E-mail: wangbl@hit.edu.cn)

中图分类号: O341
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- 被引次数: 0
出版历程
- 收稿日期: 2023-05-12
- 修回日期: 2023-05-24
- 刊出日期: 2023-11-01

Evaluation of Fracture and its Effects on Energy Conversion Performance of Porous Foam Thermoelectric Generators

1.
Research Institute of Interdisciplinary Science, Dongguan University of Technology, Dongguan, Guangdong 523808, P.R.China
2.
School of Science, Harbin Institute of Technology, Shenzhen, Shenzhen, Guangdong 518055, P.R.China

摘要

摘要: 热电器件能把废热转化为电能，减少二氧化碳排放，符合国家节能减排、逐步实现碳中和的发展需求. 该文通过建立多孔热电器件的热、电传导分析模型，解释了多孔热电泡沫高输出功率的内在机制，并揭示了几何结构及孔隙率对断裂破坏的影响机理. 在此基础上，阐明了断裂破坏对器件转化性能的影响规律. 研究发现，随着孔隙率的增加，热电泡沫与金属层之间的界面剪切应力减小. 同时，只要多孔热电泡沫的内部裂纹开始扩展就不会停止，直至器件完全破坏. 此外，随着裂纹扩展，输出功率呈现先增加后减小的趋势. 这是因为裂纹的形成间接增大了热电泡沫的孔隙率，导致器件与废热的接触面积增大，进而提高热电器件的输出功率；随着裂纹进一步扩展，其必然减弱热电器件的导热和导电性能，进而减小热电器件的输出功率.
- 热电器件 /
- 多孔结构 /
- 断裂 /
- 废热回收 /
- 输出功率
Abstract: The thermoelectric generator could convert the waste heat into electricity and reduce carbon dioxide emissions. This meets the national development needs for energy conservation and emission reduction, and finally helps realize the carbon neutrality. The heat and electric conduction model was established to explain the internal mechanism of high output power of the porous thermoelectric foam. The effects of geometry and porosity on the fracture failure of the porous thermoelectric foam were also discussed. Then, the influential mechanism of fracture on the energy conversion performance of the porous thermoelectric foam was revealed. The results show that, the interfacial shear stress between the thermoelectric foam and the metal layer will decrease with the porosity. As long as an internal crack of the porous thermoelectric foam starts to extend, it will not stop until the device is completely broken. Moreover, the output power will first increase to the peak value and then decrease with the crack propagation. This is because the crack propagation indirectly raises the porosity of the thermoelectric foam and the contact area between the thermoelectric foam and the waste heat, and in turn promotes the output power of the thermoelectric device. With further crack propagation, both the thermal conductivity and the electrical conductivity of the thermoelectric foam will weaken, and the output power of the thermoelectric foam will decrease.
- thermoelectric generator /
- porous structure /
- fracture /
- waste heat harvesting /
- power output

HTML全文

图 1 多孔热电泡沫样品与多孔泡沫热电器件用于温差发电^[18]

Figure 1. Samples of the porous thermoelectric foam and the thermoelectric power generation^[18]

下载: 全尺寸图片幻灯片

图 2 多孔泡沫热电器件工作原理示意图

Figure 2. Schematic diagram of the circuit for the porous thermoelectric foam for power generation

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图 3 二分法求解T_h数值解流程图

Figure 3. The flowchart for the bisection method to obtain numerical solution of T_h

下载: 全尺寸图片幻灯片

图 4 层间剪切应力τ₁和输出功率P_out随孔隙率的变化曲线

Figure 4. Distributions of interlaminar shear stress τ₁ and power output P_out vs. the porosity

下载: 全尺寸图片幻灯片

图 5 裂纹长度对应力强度因子K和输出功率P_out的影响规律(T_g=900 K)

Figure 5. Distributions of stress intensity factor K and power output P_out vs. the crack length (T_g=900 K)

下载: 全尺寸图片幻灯片

表 1 致密碲化铅和铜的材料参数^[24]

Table 1. Material properties of dense lead telluride and copper^[24]

parameter	value
thermal conductivity k_d/(W·m^-1·K^-1)	1.73
electrical resistivity ρ_d/(Ω^-1·m^-1)	6.37 ×10^-4
Seebeck coefficient S/(μV·K^-1)	274
thermal expansion coefficient α₁/K^-1	4.1 ×10^-5
Young’s modulus E_d/GPa	51.76
Poisson’s ratio υ₁	0.28
thermal expansion coefficient α₀/K^-1	1.76 ×10^-5
Young’s modulus E₀/GPa	119
Poisson’s ratio υ₀	0.326

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