Effective thermal conductivity of unsaturated granular geocomposite using lattice element method

Clicks: 357
ID: 113014
2018
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Abstract
Soil thermal conductivity has an important role in geo-energy applications and heat transfer modelling. The performances and efficiencies of such applications are strongly affected by the saturation conditions, especially at the lower saturation, which can negatively affect the soil thermal conductivity. Therefore, it is essential to improve the soil thermal conductivity at lower saturation levels. Here, we investigate the effect of the fillers, soil gradation and the water saturation on the thermal conductivity of sand as an innovative improvement method. The experimental results show a significant improvement in the thermal conductivity at dry and lower saturation degrees and a considerable improvement in the case of full saturation. The improvement in the thermal conductivity is comparatively high in dry state and is decreasing with increase in the saturation. The existing soil thermal conductivity models, which are limited to a specific boundary conditions and soil types, fail to consider the effect of soil filler composite behaviour. Therefore, a mesoscale numerical method is developed to model the change in effective thermal conductivity. The developed model shows a good agreement with the measured thermal conductivity values.
Reference Key
shrestha2018heateffective Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Dinesh Shrestha;Zarghaam Haider Rizvi;Frank Wuttke;Dinesh Shrestha;Zarghaam Haider Rizvi;Frank Wuttke;
Journal heat and mass transfer
Year 2018
DOI
doi:10.1007/s00231-018-02544-3
URL
https://doi.org/10.1007%2Fs00231-018-02544-3
Keywords
thermodynamics Heat and Mass Transfer engineering thermodynamics industrial chemistry/chemical engineering

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