Spherical and cylindrical conductive thermal diodes based on VO2

被引：5

作者：

Olawale Kasali, Suraju ^{[1
]}

Ordonez-Miranda, Jose ^{[1
]}

Joulain, Karl ^{[1
]}

机构：

[1] Univ Poitiers, CNRS, Inst Pprime, ISAE ENSMA, F-86962 Futuroscope, France

来源：

EUROPEAN PHYSICAL JOURNAL PLUS | 2019年 / 134卷 / 07期

关键词：

RECTIFICATION;

D O I：

10.1140/epjp/i2019-12782-y

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

.We theoretically and comparatively study the performance of spherical and cylindrical conductive thermal diodes operating with a phase-change material, whose thermal conductivity significantly changes in a narrow interval of temperatures. Simple analytical expressions are derived for the temperature profiles, heat flows and optimal rectification factors of both diodes. It is shown that the diode geometry has a strong impact on the temperatures and heat flows, but not so much on the diode rectification factor. Optimal rectification factors of 20.8% and 20.7% are obtained for the spherical and cylindrical diodes operating with a temperature difference of 376-300 = 76 K and 376.5-300 = 76.5 K between the terminals of VO2 and a phase invariant material, respectively. These similar rectification factors could be enhanced with a material thermal conductivity exhibiting a higher contrast than that of VO2 . The obtained results can thus be useful to guide the development of phase-change materials able to optimize the rectification of conductive thermal diodes with different geometries.

引用

页数：7

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