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Nonmonotonic near-field heat transfer between a pair of spheres.

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Title: Nonmonotonic near-field heat transfer between a pair of spheres.
Authors: Rahman, Asim Ur (AUTHOR), Ni, Chen (AUTHOR), Abbas, Muhammad Basir (AUTHOR), Khan, M. Shahid Iqbal (AUTHOR), Ma, Yungui1 (AUTHOR) yungui@zju.edu.cn
Source: Journal of Quantitative Spectroscopy & Radiative Transfer. Dec2025, Vol. 347, pN.PAG-N.PAG. 1p.
Subjects: Spheres, Resonance, Thermal conductivity, Optical resonance, Heat radiation & absorption, Phonons, Energy transfer
Abstract: We study near-field radiative heat exchange between a pair of equal and unequal radii of spheres, exploring the effects of material properties, sphere radii, and separation distances by following the exact mathematical solution. Previous studies suggested that larger area of the object transfer larger heat compared to smaller area of the object. However, our study reveals that this is not always true. We propose the first way to achieve unique results such that the conductance can be higher for a smaller area of the spheres. For equal-sized spheres, the thermal conductance increases with radius due to enhanced resonant coupling in tellurium and surface phonon polaritons in silicon dioxide. For unequal radii, we observe non-monotonic conductance trends in tellurium caused by hybridization of resonant modes. The role of Mie resonance in SiC, which is associated with size dependent effects and non-monotonic trends in both symmetric and asymmetric configurations, is highlighted. Quasi-Normal Mode analysis highlights the role of coupled resonances in modulating heat transfer. • Thermal conductance anomaly, where smaller surface areas exhibit higher near-field heat transfer than larger ones. • Size-dependent energy transport reveals the influence of geometry on near-field radiative heat transfer. • Surface phonon resonance and Mie resonance play a key role in modifying radiative heat transfer. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:We study near-field radiative heat exchange between a pair of equal and unequal radii of spheres, exploring the effects of material properties, sphere radii, and separation distances by following the exact mathematical solution. Previous studies suggested that larger area of the object transfer larger heat compared to smaller area of the object. However, our study reveals that this is not always true. We propose the first way to achieve unique results such that the conductance can be higher for a smaller area of the spheres. For equal-sized spheres, the thermal conductance increases with radius due to enhanced resonant coupling in tellurium and surface phonon polaritons in silicon dioxide. For unequal radii, we observe non-monotonic conductance trends in tellurium caused by hybridization of resonant modes. The role of Mie resonance in SiC, which is associated with size dependent effects and non-monotonic trends in both symmetric and asymmetric configurations, is highlighted. Quasi-Normal Mode analysis highlights the role of coupled resonances in modulating heat transfer. • Thermal conductance anomaly, where smaller surface areas exhibit higher near-field heat transfer than larger ones. • Size-dependent energy transport reveals the influence of geometry on near-field radiative heat transfer. • Surface phonon resonance and Mie resonance play a key role in modifying radiative heat transfer. [ABSTRACT FROM AUTHOR]
ISSN:00224073
DOI:10.1016/j.jqsrt.2025.109653