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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw
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Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw

机译：确定与空气通过大豆秸秆流相关的Forchheimer方程系数的实验方法

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摘要

The paper presents results of experimental investigation conducted to determine permeability coefficient of a porous bed formed by biomass bales, whereby the said coefficient represents one of the most important parameters of the bed material specified when considering its combustion in the pusher-type furnaces (i.e. combustion of biomass bales in cigar burners). Correlations obtained are deemed very important for optimization of biomass bale combustion, as well as for modeling transport phenomena occurring in the porous bed formed by biomass bales during their combustion in cigar burners. In order to determine permeability coefficient of air flow through soy straw bales, appropriate experimental method was developed and suitable experimental apparatus designed and constructed. The relevant coefficients were determined in such manner as to be representative of the viscous and inertial terms of the Forchheimer equation. Experimental investigation conducted examined the effects of relevant biomass bale parameters i.e. porosity and the moisture content on the abovementioned Forchheimer coefficients. Measurements conducted, as well as analysis of the results obtained, defined functional dependencies of the permeability coefficients on the porosity (which was varied in the range 0.62-0.78, for moisture content of 0.0948) and the sample's moisture content (which was varied in the range 0.0948-0.6394, for the selected value of porosity of 0.68) to be established. The correlations obtained are deemed suitable to be used in a broad spectrum of operating conditions that usually occur during real operation. Results obtained indicate that reduction in biomass bed porosity results in reduced permeability, with Forchheimer coefficients exhibiting a hyperbolic dependence on the bed porosity. Since it has been observed that increased moisture content of the sample (porosity value of 0.68) caused a decrease in permeability, a functional dependence of the sample moisture content on the porosity has been established. The dependence established is valid for the range of the sample moisture content between 0.0948 and 0.6394. Permeability coefficients, as well as their dependencies on the relevant factors (porosity and moisture content), represent basic data used in mathematical modeling of biomass bale combustion in cigar burners. In addition, the ones may also be very important when considering modifications of furnaces utilizing the combustion principle mentioned.
机译：本文介绍了为确定由生物质包形成的多孔床的渗透系数而进行的实验研究的结果，其中，该系数代表了考虑在推进式炉中燃烧（即燃烧）时指定的床材料的最重要参数之一。雪茄炉中的生物质包的数量）。所获得的相关性被认为对于优化生物质包燃烧以及建模在由雪茄燃烧器燃烧期间由生物质包形成的多孔床中发生的运输现象非常重要。为了确定通过大豆秸秆的气流的渗透系数，开发了合适​​的实验方法，并设计和构造了合适的实验装置。以代表福希海默方程式的粘性项和惯性项的方式确定相关系数。进行的实验研究检查了相关生物量包参数，即孔隙率和水分含量对上述福希海默系数的影响。进行的测量以及对获得的结果的分析定义了渗透系数与孔隙率（水分含量为0.0948，在0.62-0.78范围内变化）和样品水分含量（在孔隙度中的变化范围）之间的函数相关性。范围0.0948-0.6394，对于选定的孔隙度0.68的值将被建立。所获得的相关性被认为适合在实际运行期间通常发生的各种运行条件中使用。获得的结果表明，生物质床孔隙度的降低导致渗透率降低，Forchheimer系数对床孔隙率表现出双曲线依赖性。由于已经观察到样品中水分含量的增加（孔隙度值为0.68）导致渗透率降低，因此已经确定了样品水分含量对孔隙率的功能依赖性。建立的相关性对于样品水分含量在0.0948和0.6394之间的范围是有效的。渗透系数及其对相关因素（孔隙度和水分含量）的依赖性代表了用于雪茄燃烧器中生物质捆包燃烧数学模型的基本数据。另外，当考虑利用所提到的燃烧原理对熔炉进行修改时，这些也可能非常重要。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2011年第20期|p.4300-4306|共7页
  • 作者

    A. Eric; D. Dakic; S. Nemoda; M. Komatina; B. Repic;

  • 作者单位

    University of Belgrade, Institute of Nuclear Sciences "Vinca", Laboratory for Thermal Engineering and Energy, P.O. Box 522, 11001 Belgrade, Serbia;

    University of Belgrade, Faculty of Mechanical Engineering, Innovation Centre, Kraljice Marije 16, 11120 Belgrade 35, Serbia;

    University of Belgrade, Institute of Nuclear Sciences "Vinca", Laboratory for Thermal Engineering and Energy, P.O. Box 522, 11001 Belgrade, Serbia;

    University of Belgrade, Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade 35, Serbia;

    University of Belgrade, Institute of Nuclear Sciences "Vinca", Laboratory for Thermal Engineering and Energy, P.O. Box 522, 11001 Belgrade, Serbia;

  • 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

    soya residue; combustion; permeability; forchheimer equation;

    机译：大豆残渣;燃烧;渗透率;Forchheimer方程;

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