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INFLUENCES OF TEMPERATURE DIFFERENCE AND BIOT NUMBER ON COMPLEX LOCAL THERMAL NONEQUILIBRIUM IN POROUS MEDIA

巻 25, 発行 4, 2022, pp. 1-16
DOI: 10.1615/JPorMedia.2021039729
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要約

Heat transfer in porous media with low thermal conductivity has been extensively applied in packed-bed thermal energy storage (TES) systems, enhanced geothermal systems (EGS), the technology for coal fire prevention and extinguishment, and so on. To increase numerical accuracy, the simplified multiscale model can be used to describe heat transfer characteristics in porous media with low thermal conductivity, but it can also dramatically increase computation time and memory space compared with the local thermal nonequilibrium (LTNE) at the representative elementary volume (REV) scale. A criterion to choose the suitable model in small-thermal-conductivity porous media is proposed in this work, which is defined as the dynamic Biot (DBiot) number. The criterion is based on not only the Biot number to consider the influence of internal cause but also the temperature difference between solid particle surface and fluid to consider the influence of external cause. The influence of the DBiot number on the complex LTNE characteristics has been investigated with a temperature difference ranging from 0.1 to 1000 K and Biot number from 0.01 to 10. The results show that the maximum temperature difference inside the solid particle is related to the Biot number but also determined by the initial temperature difference between the solid particle surface and fluid, and the maximum temperature difference at different times is different although the Biot number is the same. When the initial DBiot number is less than 1, the complex LTNE effect can be neglected and the real DBiot number also has a significant effect on the LTNE in a small-thermal-conductivity porous medium, as the initial temperature difference between the solid particle surface and fluid is in a suitable range. In practical applications, fluid flow characteristics have a significant effect on the LTNE characteristics in small-thermal-conductivity porous media, which can be explained by the DBiot number.

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