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首页> 外文期刊>International Journal of Heat and Mass Transfer >Quantification of subsurface thermal regimes beneath evaporating porous surfaces
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Quantification of subsurface thermal regimes beneath evaporating porous surfaces

机译：量化蒸发的多孔表面下的地下热态

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摘要

The spatial distribution and dynamics of non-uniform evaporative mass fluxes from porous media are quantified remotely from induced surface thermal field obtained by spatially resolved infrared thermom-etry. Conversion of surface thermal signatures to the estimation of evaporation fluxes hinges on knowledge of the unobservable characteristic thermal decay depth. We considered quasi-static evaporation fluxes combined with measured surface thermal fields within a surface energy balance model to obtain a general analytical approximation for the thermal decay depth. This approximation was experimentally evaluated using side view IR imagery of temperature fields beneath an evaporative surface. The analytical approximation reveals dependency of thermal decay depth on the magnitude of evaporative flux which was also sensitive to convection and radiation intensity. Results indicate that typical values of evapo-thermal decay depth for a wide range of natural soil surfaces is in the range of a few centimeters (<5 cm). The solution enables remote estimation of non-uniform evaporative fluxes from surface temperature fields [1].
机译：来自多孔介质的非均匀蒸发质量通量的空间分布和动力学是通过由空间分辨红外热像仪获得的感应表面热场远程量化的。将表面热特征转换为蒸发通量的估计取决于对不可观察到的特征热衰减深度的了解。我们考虑将准静态蒸发通量与表面能平衡模型中测得的表面热场相结合，以获得热衰减深度的一般分析近似值。该近似值是使用蒸发表面下温度场的侧视图红外图像通过实验评估的。解析近似表明，热衰减深度与蒸发通量的大小有关，蒸发通量对对流和辐射强度也很敏感。结果表明，广泛的天然土壤表面的蒸发热衰减深度的典型值在几厘米（<5 cm）的范围内。该解决方案能够从表面温度场[1]远程估算不均匀的蒸发通量。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第20期|p.4193-4202|共10页
  • 作者

    E. Shahraeeni; D. Or;

  • 作者单位

    Soil and Terrestrial Environmental Physics (STEP) Laboratory. Institute of Terrestrial Ecosystems. Swiss Federal Institute of Technology (ETHZ), Zurich 8092. Switzerland Institute of Fluid Dynamics, Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology (ETHZ), Zurich 8092, Switzerland;

    Soil and Terrestrial Environmental Physics (STEP) Laboratory. Institute of Terrestrial Ecosystems. Swiss Federal Institute of Technology (ETHZ), Zurich 8092. Switzerland;

  • 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

    evaporation; porous media; infrared thermography; heat and mass transfer;

    机译：蒸发;多孔介质;红外热成像;传热传质;

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