Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Characterization of Thermal Properties for Glass Beads - Rubber Mixture

글라스 비즈 - 고무 분말 혼합물의 열전달 특성 연구

  • Lee, Jung-Hwoon (Dept. of Civil and Environmental Engineering, Yonsei Univ.) ;
  • Yun, Tae-Sup (Dept. of Civil and Environmental Engineering, Yonsei Univ.) ;
  • Evans, T. Matthew (Dept. of Civil, Construction and Environmental Engineering, North Carolina State Univ.)
  • 이정훈 (연세대학교 토목환경공학과) ;
  • 윤태섭 (연세대학교 토목환경공학과) ;
  • 매튜 에반스 (노스캐롤라이나대학교 토목환경공학과)
  • Received : 2011.04.29
  • Accepted : 2011.11.17
  • Published : 2011.11.30
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Abstract

This study presents the thermal behaviors of glass beads-rubber mixtures depending on the volumetric fraction of each constituent and relative size between them. The transient plane source method is used to measure the effective thermal conductivity of mixtures. The discrete element method (DEM) and the thermal network model are integrated to investigate the particle-scale mechanism of heat transfer in granular packings. Results show that 1) the effective thermal conductivity decreases as the rubber fraction increases, and 2) the relative size between two solid particles dominates the spatial configuration of inter-particle contact condition that in tum determines the majority of heat propagation path through particle contacts. For the mixtures whose volumetric fraction of rubber is identical, the less conductive materials (e.g., rubber particles) with a large size facilitate heat transfer in granular materials. The experimental results and particle-scale observation highlight that the thermal conduction behavior is dominated not only by the volumetric fraction but also the spatial configuration of each constituent.

본 연구는 글라스 비드와 고무 혼합재의 부피비와 상대적인 크기 비에 따른 열적 거동에 관해 다루고 있다. 혼합 물질의 열전도도를 측정하기 위하여 비정상면열원법이 사용되었다. 개별요소법과 열 네트워크 모델을 결합하여 입상체 모사 시료에서 입자 단위의 열전달 매커니즘을 분석하였다. 실험 및 해석의 결과는 다음과 같다. 유효 열전도도는 고무의 부피비가 증가할수록 감소한다. 두 물질의 상대적인 크기는 열 전파경로의 대부분을 결정하는 입자간 접촉상태의 공간적 구성을 지배한다. 같은 부피비를 갖는 혼합물질 중에서, 열이 잘 흐르지 않는 물질(여기에서는 고무)의 입자 크기가 큰 경우 열전달이 더 원활하게 이루어진다. 이상의 실험결과와 입자 단위의 관찰은 물질의 열적 거동이 부피비 뿐 아니라 구성 성분의 공간적인 구성에도 영향을 받음을 보여준다.

Keywords

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