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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

Evaluation of Fracture and its Effects on Energy Conversion Performance of Porous Foam Thermoelectric Generators
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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. 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 fi-nally 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 poros-ity on the fracture failure of the porous thermoelectric foam were also discussed.Then,the influential mecha-nism of fracture on the energy conversion performance of the porous thermoelectric foam was revealed.The re-sults 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 con-ductivity and the electrical conductivity of the thermoelectric foam will weaken,and the output power of the thermoelectric foam will decrease.
作者 崔有江 王保林 王开发 CUI Youjiang;WANG Baoin;WANG Kaifa(Research Institute of Interdisciplinary Science,Dongguan University of Technology,Dongguan,Guangdong 523808,P.R.China;School of Science,Harbin Institute of Technology,Shenzhen,Shenzhen,Guangdong 518055,P.R.China)
出处 《应用数学和力学》 CSCD 北大核心 2023年第11期1291-1298,共8页 Applied Mathematics and Mechanics
基金 国家自然科学基金项目(12102104,11972137) 广东省基础与应用基础研究基金(2022A1515240072,2022B1515020099,2022A1515010801)。
关键词 热电器件 多孔结构 断裂 废热回收 输出功率 thermoelectric generator porous structure fracture waste heat harvesting power output
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