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High-quality quasi-monochromatic near-field radiative heat transfer designed by adaptive hybrid Bayesian optimization

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Science China(Technological Sciences) 2022年第12期65卷 2910-2920页

作者： ZHANG WenBin WANG BoXiang XU JianMing ZHAO ChangYing Institute of Engineering Thermophysics MOE Key Laboratory for Power Machinery and EngineeringSchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China

The increasing demand for versatile and high-quality near-field radiative heat transfer(NFRHT) has created a critical need for a design approach that can handle numerous candidate structures. In this work, we employ and develop an adaptive hybrid Bayesian optimization(AHBO) algorithm to design the high-quality quasi-monochromatic NFRHT. The candidate materials include hexagonal boron nitride, silicon carbide, and doped silicon. The high-quality quasi-monochromatic NFRHT is optimized over 1.0 × 10^(8) candidate structures to maximize the evaluation factor. It is worth noting that only 2.6% of the candidate structures needed to be calculated to identify the optimal structure. The optimal structure of quasi-monochromatic NFRHT is an aperiodic multilayer metamaterial that differs from conventional periodic multilayer structures. Moreover, we investigate the robustness and mechanisms of the optimal quasi-monochromatic NFRHT with respect to the vacuum gap distance and the temperature difference between the emitter and receiver. In addition, the high-quality multi-peak NFRHT is designed using the AHBO algorithm by improving the definition of the evaluation factor. The results demonstrate that the AHBO algorithm is efficient in designing high-quality quasi-monochromatic and multi-peak NFRHT, and it can be further expanded to other structural designs in the field of energy conversion.

关键词： near-field radiative heat transfer adaptive hybrid Bayesian optimization quasi-monochromaticity evaluation factor inverse design

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