High Contrast Far-Field Radiative Thermal Diode

Abstract We propose a theoretical concept of a far-field radiative thermal rectification device that uses a phase change material to achieve a high degree of asymmetry in radiative heat transfer. The proposed device has a multilayer structure on one side and a blackbody on other side. The multilayer...

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Autores principales:	Alok Ghanekar, Gang Xiao, Yi Zheng
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/168f0250bc3343af9ae6066344db526a
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id	oai:doaj.org-article:168f0250bc3343af9ae6066344db526a
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spelling	oai:doaj.org-article:168f0250bc3343af9ae6066344db526a2021-12-02T11:53:03ZHigh Contrast Far-Field Radiative Thermal Diode10.1038/s41598-017-06804-w2045-2322https://doaj.org/article/168f0250bc3343af9ae6066344db526a2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06804-whttps://doaj.org/toc/2045-2322Abstract We propose a theoretical concept of a far-field radiative thermal rectification device that uses a phase change material to achieve a high degree of asymmetry in radiative heat transfer. The proposed device has a multilayer structure on one side and a blackbody on other side. The multilayer structure consists of transparent thin film of KBr sandwiched between a thin film of VO2 and a reflecting layer of gold. When VO2 is in its insulating phase, the structure is highly reflective due to the two transparent layers on highly reflective gold. When VO2 is in the metallic phase, Fabry-Perot type of resonance occurs and the tri-layer structure acts like a wide-angle antireflection coating achieved by destructive interference of partially reflected waves making it highly absorptive for majority of spectral range of thermal radiation. The proposed structure forms the active part of configuration that acts like a far-field radiative thermal diode. Thermal rectification greater than 11 is obtained for a temperature bias of 20 K, which is the highest rectification ever predicted for far-field radiative diode configurations.Alok GhanekarGang XiaoYi ZhengNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alok Ghanekar Gang Xiao Yi Zheng High Contrast Far-Field Radiative Thermal Diode
description	Abstract We propose a theoretical concept of a far-field radiative thermal rectification device that uses a phase change material to achieve a high degree of asymmetry in radiative heat transfer. The proposed device has a multilayer structure on one side and a blackbody on other side. The multilayer structure consists of transparent thin film of KBr sandwiched between a thin film of VO2 and a reflecting layer of gold. When VO2 is in its insulating phase, the structure is highly reflective due to the two transparent layers on highly reflective gold. When VO2 is in the metallic phase, Fabry-Perot type of resonance occurs and the tri-layer structure acts like a wide-angle antireflection coating achieved by destructive interference of partially reflected waves making it highly absorptive for majority of spectral range of thermal radiation. The proposed structure forms the active part of configuration that acts like a far-field radiative thermal diode. Thermal rectification greater than 11 is obtained for a temperature bias of 20 K, which is the highest rectification ever predicted for far-field radiative diode configurations.
format	article
author	Alok Ghanekar Gang Xiao Yi Zheng
author_facet	Alok Ghanekar Gang Xiao Yi Zheng
author_sort	Alok Ghanekar
title	High Contrast Far-Field Radiative Thermal Diode
title_short	High Contrast Far-Field Radiative Thermal Diode
title_full	High Contrast Far-Field Radiative Thermal Diode
title_fullStr	High Contrast Far-Field Radiative Thermal Diode
title_full_unstemmed	High Contrast Far-Field Radiative Thermal Diode
title_sort	high contrast far-field radiative thermal diode
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/168f0250bc3343af9ae6066344db526a
work_keys_str_mv	AT alokghanekar highcontrastfarfieldradiativethermaldiode AT gangxiao highcontrastfarfieldradiativethermaldiode AT yizheng highcontrastfarfieldradiativethermaldiode
_version_	1718394851892920320

High Contrast Far-Field Radiative Thermal Diode

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