The Equivalent Thermal Conductivity of the Micro/Nano Scaled Periodic Cubic Frame Silver and Its Thermal Radiation Mechanism Analysis

Haiyan Yu, Haochun Zhang, Heming Wang and Dong Zhang
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Haiyan Yu: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Haochun Zhang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Heming Wang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Dong Zhang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2021, vol. 14, issue 14, 1-15

Abstract: Currently, there are few studies on the influence of microscale thermal radiation on the equivalent thermal conductivity of microscale porous metal. Therefore, this paper calculated the equivalent thermal conductivity of high-porosity periodic cubic silver frame structures with cell size from 100 nm to 100 µm by using the microscale radiation method. Then, the media radiation characteristics, absorptivity, reflectivity and transmissivity were discussed to explain the phenomenon of the radiative thermal conductivity changes. Furthermore, combined with spectral radiation properties at the different cross-sections and wavelength, the radiative transmission mechanism inside high-porosity periodic cubic frame silver structures was obtained. The results showed that the smaller the cell size, the greater radiative contribution in total equivalent thermal conductivity. Periodic cubic silver frames fluctuate more in the visible band and have better thermal radiation modulation properties in the near infrared band, which is formed by the Surface Plasmon Polariton and Magnetic Polaritons resonance jointly. This work provides design guidance for the application of this kind of periodic microporous metal in the field of thermal utilization and management.

Keywords: micro scale; thermal radiation; equivalent thermal conductivity; thermal radiation mechanism (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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