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Estimation of overall heat transfer coefficients in packed beds with cocurrent downflow of gas and liquid

机译：气体和液体并流向下流动时填充床中总传热系数的估算

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摘要

This contribution undertakes the analysis of heat transfer between a packed bed with cocurrent downflow of gas and liquid, widely known as trickle bed reactor, and an external heating or cooling fluid. Experiments were carried out in a bench scale reactor with water and air, covering trickle and pulsing regimes, in beds presenting aspect ratios (tube to particle diameter ratio) from 4.7 to 34. Four sizes of glass spheres, two of glass cylinders, a mixture of spheres and a commercial trilobe pellet were employed as particles. With the purpose of estimating the overall heat transfer rates, a 1D pseudo-homogeneous model with a single parameter (overall bed heat transfer coefficient, h_T) was employed to analyze the experimental results. An expression to estimate h_T (expressed as Nusselt number) for the low interaction regime in terms of liquid Reynolds number, a pellet shape factor and bed to particle diameter ratio is proposed. This expression approximates the experimental values with an average deviation of around 10%.
机译：该贡献进行了气体和液体并流向下流动的填充床与外部加热或冷却流体之间的传热分析，气体和液体并流向下流动。实验在具有水和空气的台式反应器中进行，涉及滴流和脉冲状态，床中的长宽比（管与粒径的比）为4.7至34。四种尺寸的玻璃球，两个玻璃圆柱，混合物球体和市售的三叶颗粒用作颗粒。为了估计总的传热速率，采用具有单个参数（总床传热系数，h_T）的一维伪均质模型来分析实验结果。提出了一种根据液体雷诺数，颗粒形状因子和床与粒径比来估计低相互作用状态下的h_T（以Nusselt数表示）的表达式。该表达式近似于实验值，平均偏差约为10％。

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  • 来源
    《Fuel》 |2014年第15期|176-182|共7页
  • 作者

    Maria J. Taulamet; Nestor J. Mariani; Guillermo F. Barreto; Osvaldo M. Martinez;

  • 作者单位

    PROIRQ, Departamento de Ingenieria Quimica, Facultad de Ingenieria, UNLP, La Plata, Argentina Centro de Investigacion y Desarrollo en Ciencias Aplicadas 'J.J.Ronco' (CINDECA), CCT La Plata-CONICET-UNLP, Calle 47 No. 257, CP B1900AJK, La Plata, Argentina;

    PROIRQ, Departamento de Ingenieria Quimica, Facultad de Ingenieria, UNLP, La Plata, Argentina Centro de Investigacion y Desarrollo en Ciencias Aplicadas 'J.J.Ronco' (CINDECA), CCT La Plata-CONICET-UNLP, Calle 47 No. 257, CP B1900AJK, La Plata, Argentina;

    PROIRQ, Departamento de Ingenieria Quimica, Facultad de Ingenieria, UNLP, La Plata, Argentina Centro de Investigacion y Desarrollo en Ciencias Aplicadas 'J.J.Ronco' (CINDECA), CCT La Plata-CONICET-UNLP, Calle 47 No. 257, CP B1900AJK, La Plata, Argentina;

    PROIRQ, Departamento de Ingenieria Quimica, Facultad de Ingenieria, UNLP, La Plata, Argentina Centro de Investigacion y Desarrollo en Ciencias Aplicadas 'J.J.Ronco' (CINDECA), CCT La Plata-CONICET-UNLP, Calle 47 No. 257, CP B1900AJK, La Plata, Argentina;

  • 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

    Trickle bed reactors; Overall heat transfer rates; One-dimensional pseudohomogeneous; model;

    机译：ckle流床反应器;总传热率;一维伪同质;模型;

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