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首页> 外文期刊>International Journal of Heat and Mass Transfer >Simulations of Melting in Fluid-filled Packed Media due to Forced Convection with Higher Temperature
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Simulations of Melting in Fluid-filled Packed Media due to Forced Convection with Higher Temperature

机译：由于具有较高温度的强制对流而导致流体填充介质中熔化的模拟

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摘要

An original CFD-DEM method, named as CD-MELT, is developed to model the isothermal melting of a packed bed subjected to a forced convection with higher temperature. The formulation of CD-MELT allows a high degree of representation of the melting process. With specific melting parameters, the particles in the packed bed undergo mass, diameter and temperature change individually, and the packed bed is reconfigured afterward through particles collision and contact. The phase changes are accounted for via source terms using a mass loss fraction, ranging from 0 (initial mass) to 1 (complete melting), which is introduced for the first time and differs from other existing models. The CD-MELT's predictions are compared with the results from an earlier experimental study on the melting of a single ice sphere as well as a packed bed of ice spheres due to a forced convection of warm water. The comparison is found to be satisfactory despite the use of a coarse mesh, and the computation run is stable despite the varying mesh-particle size ratio. Finally, the effects of spring constant and restitution coefficient in the particle collision model are further investigated for the case of a non-floating packed bed under forced convection. Recommendations are made on how their suitable values can be determined in future melting studies.
机译：原始的CFD-DEM方法命名为CD-熔体，开发成模拟填充床的等温熔化，其具有较高温度的强制对流。 CD-熔体的制剂允许高度的熔融过程表示。具有特定熔化参数，填充床中的颗粒经历质量，直径和温度变化，并且通过颗粒碰撞和接触之后重新配置填充床。使用质量损失分数，从0（初始质量）到1（完全熔化）的源术语计算相变，这是第一次引入并与其他现有模型的不同。将CD-Melt的预测与早期实验研究的结果进行了比较，这对单个冰球的熔化以及由于温水的强制对流而填充的冰球床。尽管使用粗啮合，但是尽管使用粗糙网格，但仍然存在令人满意的比较，尽管网格粒度比不同，但计算运行稳定。最后，为了在强制对流下进一步研究了颗粒碰撞模型中弹簧常数和恢复系数的影响。建议是如何在未来熔化研究中确定合适的值。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第8期|121358.1-121358.14|共14页
  • 作者

    Genevieve Soon; Hui Zhang; Chun Yang; Adrian Wing-Keung Law;

  • 作者单位

    Environmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 CleanTech Loop Singapore 637141 Interdisciplinary Graduate Programme Graduate College Nanyang Technological University 61 Nanyang Drive Singapore 637335 School of Civil and Environmental Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798;

    Environmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 CleanTech Loop Singapore 637141;

    School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798;

    Environmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 CleanTech Loop Singapore 637141 School of Civil and Environmental Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798;

  • 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

    discrete element method; computational fluid dynamics; packed bed; particle melting;

    机译：离散元素法;计算流体动力学;包装床;颗粒熔化;

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