Near-field radiative heat transfer between two nanoporous silicon carbide (SiC) can be remarkably enhanced by inserting an intermediate body with finite thickness. The heat flux of the proposed system is enhanced significantly comparing with that of the two-body counterpart, because the intermediate body which behaves like a midrepeater can assist the transfer of the surface phonon polaritons (SPhPs) and hyperbolic phonon polaritons (HPPs). Both the filling fraction of air in the nanoporous SiC and the thickness of the intermediate body play important roles to the radiative heat flux. The heat flux experiences a first increase and then decrease process for the fixed filling fraction as the thickness of the intermediate body increases, and it can reach a maximum value. The maximum heat flux shifts toward larger thickness of intermediate body when the filling fraction increases. The dependence of heat flux on filling fraction is also studied in detail. The results obtained in this work provide an efficient way to further enhance the near-field radiative heat transfer.

Graphical abstract

(a) The heat fluxes of the three-body system and the corresponding two-body counterpart as a function of the vacuum gaps. The thickness of the body 2 is \(\delta = 30\) nm and the filling fractions for both three-body and two-body systems are fixed at \(f = 0.3\). It is seen that the heat flux in the three-body system enhanced remarkably compared with its two-body counterpart. (b) The dependence of heat fluxes on vacuum gaps \(d_{1}\) and \(d_{2}\) for different filling fractions. The heat flux can be modulated by filling fraction.

中文翻译：

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纳米多孔碳化硅三体系统的近场辐射传热

通过插入具有有限厚度的中间体，可以显着增强两个纳米多孔碳化硅 (SiC) 之间的近场辐射传热。与双体对应物相比，所提出系统的热通量显着增强，因为中间体的行为类似于中中继器，可以帮助表面声子极化子 (SPhPs) 和双曲声子极化子 (HPPs) 的转移。纳米多孔 SiC 中空气的填充率和中间体的厚度都对辐射热通量起着重要作用。随着中间体厚度的增加，固定填充率的热通量经历先增后减的过程，并达到最大值。当填充率增加时，最大热通量向中间体的较大厚度移动。还详细研究了热通量对填充率的依赖性。在这项工作中获得的结果为进一步增强近场辐射传热提供了一种有效的方法。

图形概要

(a) 三体系统和相应的二体系统的热通量作为真空间隙的函数。主体 2 的厚度为\(\delta = 30\)  nm，三体和二体系统的填充分数固定为\(f = 0.3\)。可以看出，三体系统中的热通量与两体系统相比显着增强。(b)对于不同的填充率，热通量对真空间隙\(d_{1}\)和\(d_{2}\)的依赖性。热通量可以通过填充分数来调节。