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Numerical analysis of convective drying of gypsum boards

机译：石膏板对流干燥的数值分析

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摘要

Convective drying of gypsum boards is investigated by numerical modelling, within the context of gypsum board manufacturing where enhancing processing efficiency, reducing energy usage and optimising product quality are essential. The aim of this parametric study is to provide a first step towards modelling of the drying process in an industrial drier by investigating the main factors impacting the drying process, such as the influence of air speed, turbulence intensity, approach flow temperature and heterogeneous drying conditions but also the influence of the paper liner on the drying process. Therefore, this study is performed for a simple configuration and at ambient air temperatures. In terms of air flow modelling, CFD simulations are performed in addition to the use of standard convective transfer coefficients. The sensitivity of the drying process to the air flow conditions is found to be limited for a gypsum board with a paper liner due to the high resistance of the paper liner to vapour transport, compared to the boundary layer resistance. Thus, guidelines for modelling drying of gypsum boards under representative manufacturing conditions conclude that detailed flow modelling is less critical to assess this specific drying problem. Instead, characterisation of the material transport properties at high temperatures is more relevant, particularly for the paper liner.
机译：通过数值建模研究了石膏板的对流干燥，在石膏板制造的背景下，提高加工效率，减少能耗和优化产品质量至关重要。本参数研究的目的是通过研究影响干燥过程的主要因素，例如风速，湍流强度，进料温度和非均匀干燥条件的影响，为工业干燥机中干燥过程的建模提供第一步。而且还有纸衬对干燥过程的影响。因此，本研究是针对简单的配置并在环境温度下进行的。在气流建模方面，除使用标准对流传递系数外，还执行CFD模拟。对于具有纸衬的石膏板，发现干燥过程对空气流动条件的敏感性受到限制，这是因为与边界层电阻相比，纸衬对蒸气传输的高阻力。因此，在代表性制造条件下对石膏板干燥进行建模的准则得出结论，详细的流动建模对于评估此特定干燥问题的重要性较低。取而代之的是，高温下材料传输特性的表征更为重要，特别是对于纸衬。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第10期|p.2590-2600|共11页
  • 作者

    Thijs Defraeye; Geert Houvenaghel; Jan Carmeliet; Dominique Derome;

  • 作者单位

    Swiss Federal Institute of Technology Zuerich (ETHZ), Wolfgang-Pauli-Strasse 15, 8093 Zuerich, Switzerland,VCBT/MeBioS, Department of Biosystems, Katholieke Universiteit Leuven, Willem de Croylaan 42, 3001 Heverlee, Belgium;

    Lafarge Centre de Recherche, 95 rue Montmurier PB15, 389291 Saint Quentin Fallavier, France;

    Swiss Federal Institute of Technology Zuerich (ETHZ), Wolfgang-Pauli-Strasse 15, 8093 Zuerich, Switzerland,Laboratory for Building Science and Technology, Swiss Federal laboratories for Materials Testing and Research (Empa), UEberlandstrasse 129, 8600 Duebendorf Switzerland;

    Wood Laboratory, Swiss Federal Laboratories for Materials Testing and Research (Empa), UEberlandstrasse 129, 8600 Duebendorf, 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

    convective drying; gypsum board; heat and moisture transfer; manufacturing; convective transfer coefficient; paper liner;

    机译：对流干燥;石膏板;热湿传递;制造;对流传递系数;纸衬;

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