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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]
Copyright of Journal of Quantitative Spectroscopy & Radiative Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 189035338
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Nonmonotonic near-field heat transfer between a pair of spheres.
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  Data: <searchLink fieldCode="AR" term="%22Rahman%2C+Asim+Ur%22">Rahman, Asim Ur</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ni%2C+Chen%22">Ni, Chen</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abbas%2C+Muhammad+Basir%22">Abbas, Muhammad Basir</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khan%2C+M%2E+Shahid+Iqbal%22">Khan, M. Shahid Iqbal</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ma%2C+Yungui%22">Ma, Yungui</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yungui@zju.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Quantitative+Spectroscopy+%26+Radiative+Transfer%22">Journal of Quantitative Spectroscopy & Radiative Transfer</searchLink>. Dec2025, Vol. 347, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Spheres%22">Spheres</searchLink><br /><searchLink fieldCode="DE" term="%22Resonance%22">Resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+resonance%22">Optical resonance</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+radiation+%26+absorption%22">Heat radiation & absorption</searchLink><br /><searchLink fieldCode="DE" term="%22Phonons%22">Phonons</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+transfer%22">Energy transfer</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Quantitative Spectroscopy & Radiative Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.jqsrt.2025.109653
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Spheres
        Type: general
      – SubjectFull: Resonance
        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Optical resonance
        Type: general
      – SubjectFull: Heat radiation & absorption
        Type: general
      – SubjectFull: Phonons
        Type: general
      – SubjectFull: Energy transfer
        Type: general
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      – TitleFull: Nonmonotonic near-field heat transfer between a pair of spheres.
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          Name:
            NameFull: Rahman, Asim Ur
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            NameFull: Ni, Chen
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            NameFull: Abbas, Muhammad Basir
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            NameFull: Khan, M. Shahid Iqbal
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            NameFull: Ma, Yungui
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            – D: 15
              M: 12
              Text: Dec2025
              Type: published
              Y: 2025
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              Value: 347
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            – TitleFull: Journal of Quantitative Spectroscopy & Radiative Transfer
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