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首页> 外文期刊>Heat Transfer Engineering >Enhanced Evaporation in a Multilayer Porous Media Under Heat Localization: A Numerical Study
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Enhanced Evaporation in a Multilayer Porous Media Under Heat Localization: A Numerical Study

机译：局部热作用下多层多孔介质中增强蒸发的数值研究

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摘要

Evaporation and steam generation are two of the most vital processes in industry. A new method to advance the efficiency of evaporation involves localizing heat at the water surface where the vapor escapes into the air to minimize energy loss. In this research, we numerically investigate the improvement of a novel evaporation process via solar heat localization in a porous medium. A layer of carbon foam with a combination of interconnected and dead-end pores with a high hydrophilicity surface adjacent to a layer of expanded graphite with known porosity and properties were modeled numerically using a finite volume method. The hydrophilic porous media facilitates the capillary forces for better transportation of the bulk water through the porous media to the top surface of the porous media where the absorbed solar energy is delivered to the water inside the pores for evaporation. Continuity, momentum, heat and mass transfer equations were solved in this modeling effort. The modeling results were validated with the experimental data available in the literature. The findings in this numerical study can shed light on the complex interplay between the fluid dynamics and heat and mass transfer across the porous medium, which are important for efficient evaporation processes.
机译：蒸发和蒸汽产生是工业上最重要的两个过程。一种提高蒸发效率的新方法包括将热量集中在水表面，蒸汽会逸散到空气中，以最大程度地减少能量损失。在这项研究中，我们数值研究了通过多孔介质中的太阳热定位对新型蒸发过程的改进。使用有限体积方法对与具有已知孔隙率和性质的膨胀石墨层相邻的，具有相互连接的孔和死角孔以及高亲水性表面的碳泡沫层进行了数值模拟。亲水性多孔介质有助于毛细作用力，以更好地将大量水通过多孔介质传输到多孔介质的顶表面，在该顶表面处吸收的太阳能被传递到孔内的水中以进行蒸发。在此建模工作中解决了连续性，动量，传热和传质方程。利用文献中提供的实验数据验证了建模结果。这项数值研究的发现可以揭示流体动力学与穿过多孔介质的传热和传质之间的复杂相互作用，这对于有效的蒸发过程很重要。

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  • 来源
    《Heat Transfer Engineering》 |2018年第16期|1355-1363|共9页
  • 作者

    Bahraseman Hamidreza Ghasemi; Languri Ehsan Mohseni;

  • 作者单位

    Tennessee Technol Univ Dept Mech Engn 1 William Jones Dr Cookeville TN 38505 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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