Experimental determination of giant interfacial thermal resistance in thermally insulating hollow glass microspheres

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-09-30 DOI:10.1016/j.icheatmasstransfer.2025.109701

Hyeong Uk Kang , Juhong Kim , Kwanghyun Kim , Joon Sang Kang

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Abstract

Hollow glass microspheres (HGMs) are extensively employed in thermal insulation applications due to their remarkably low effective thermal conductivity. However, a detailed understanding of their thermal transport mechanism remains elusive. This study aims to provide in detail the thermal transport mechanism active in HGMs, particularly focusing on interfacial thermal resistance (ITR) in a wide temperature range (120 K to 300 K). For the first time, we experimentally extract the ITR between each HGMs by employing various size of particles. The measured value is around 0.0178 m²⸱K⸱W⁻¹ at room temperature and increases to 0.039 m²⸱K⸱W⁻¹ at 120 K. Our findings reveal that HGMs demonstrate substantially lower thermal conductivity than other insulation materials owing to their very high ITR. More than 80 % of solid heat conduction is contributed by means of ITR. These comprehensive measurements and thermal transport analyses provide critical insights into the design and development of advanced thermal insulation materials that can be realized through proper ITR designs.

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隔热中空玻璃微球巨界面热阻的实验测定

中空玻璃微球（HGMs）由于其非常低的有效导热系数而广泛应用于隔热应用。然而，对它们的热输运机制的详细了解仍然难以捉摸。本研究旨在提供hgm中活跃的热传递机制的细节，特别关注在宽温度范围（120 K至300 K）的界面热阻（ITR）。我们首次通过实验提取了不同粒径的hgm之间的ITR。测量值在室温下约为0.0178 m2⸱K⸱W−1，在120k下增大到0.039 m2⸱K⸱W−1。我们的研究结果表明，由于其非常高的ITR， hgm表现出比其他绝缘材料低得多的导热性。80%以上的固体热传导是通过ITR方式完成的。这些全面的测量和热传递分析为设计和开发先进的隔热材料提供了关键的见解，可以通过适当的ITR设计来实现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.