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Fundamental study of thermal conduction in dry soils

机译：干燥土壤热传导的基础研究

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摘要

The thermal conductivity of the different soil components-mineral, liquids and air-varies across two orders of magnitude. Two studies are implemented to explore the role of contacts in heat conduction in dry granular materials. The first set of experiments is designed to elucidate heat transfer at contacts, and it is complemented with a numerically based inversion analysis for different local and boundary conditions to extract proper material parameters. Then, the thermal conductivity of dry soils is measured at different packing densities to address the relevance of coordination number and particle shape effects. Together, both studies confirm the prevailing effect of contact quality and number of contacts per unite volume on heat conduction in granular materials. Interparticle contacts and the presence of liquids in pores play a critical role in heat transfer, and determine the ordered sequence of typical thermal conductivity values:rnk_(air)＜k_(dry-soil)＜k(water)＜k_(saturatcd-soil)＜k_(mincral).
机译：不同土壤成分（矿物，液体和空气）的热导率在两个数量级上变化。进行了两项研究，以探讨干燥粒状材料中接触在热传导中的作用。第一组实验旨在阐明接触处的传热，并辅之以针对不同局部和边界条件的基于数字的反演分析，以提取适当的材料参数。然后，在不同的堆积密度下测量干燥土壤的热导率，以解决配位数和颗粒形状效应的相关性。两项研究共同证实了接触质量和单位体积接触数对粒状材料导热的主要影响。颗粒间的接触和孔中液体的存在在传热中起着至关重要的作用，并确定了典型导热系数的有序顺序：rnk_（空气）＜k_（干土）＜k（水）＜k_（饱和土） ）＜k_（mincral）。

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  • 来源
    《Granular matter》 |2008年第3期|p.197-207|共11页
  • 作者

    T. S. Yun; J. C. Santamarina;

  • 作者单位

    School of Civil and Environmental Engineering, 790 Atlantic Drive, Atlanta, GA 30332-0355, USA Department of Civil and Environmental Engineering, Lehigh University, 13 East Packer Avenue, Bethlehem, PA 18015, USA;

    rnGeorgia Institute of Technology, Atlanta, GA 30332-0335, USA Georgia Institute of Technology, Atlanta, GA 30332-0335, USA Goizueta Chair School of Civil and Environmental Engineering, 790 Atlantic Drive, Atlanta, GA 30332-0355, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    contact; conduction; diffusivity; convection; multiphase;

    机译：联系;传导扩散性对流;多相;

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