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首页> 外文期刊>Applied Mathematical Modelling >Modelling of airflow through a stack in a timber-drying kiln
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Modelling of airflow through a stack in a timber-drying kiln

机译：木材干燥窑中通过烟囱的气流建模

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A two-dimensional pore-scale model is used to predict air flow through a wood drying stack for which both the interstitial and the average flow can be considered as two-dimensional. Timber-drying kilns consist of two parts, a centre region and staggered end sections, each with different flow characteristics. In the centre region the flow resembles flow through a duct and empirical models from literature were used for the evaluation of the pressure loss across the timber stack. The staggered ends, resulting from the stacking method, were analyzed by considering them as porous media. A unified modelling theory for the prediction of the pressure drop of crossflow in a prismatic structure was proposed. The model was derived by volumetrically averaging the equations of motion over an arbitrary two-phase system of stationary solids and a traversing fluid. Closure was obtained by using a formerly introduced rectangular representation of the pore space morphology. The model was applied to a typical stack in timber-drying kilns situated in the southern and eastern parts of South Africa. A scale model was built and accurately tested in a wind tunnel. The predicted results compared favourably to the test results.
机译：二维孔隙尺度模型用于预测通过木材干燥烟囱的空气流量，间隙和平均流量均可视为二维。木材干燥窑由两个部分组成，一个是中央区域，另一个是交错的端部，每个部分具有不同的流动特性。在中心区域，流动类似于通过管道的流动，文献中的经验模型用于评估整个木材堆的压力损失。通过将堆叠方法产生的交错末端视为多孔介质进行了分析。提出了一种统一的建模理论，用于预测棱柱结构中错流的压降。该模型是通过对固定固体和横向流体的任意两相系统上的运动方程进行体积平均得出的。通过使用先前引入的孔空间形态的矩形表示获得封闭。该模型已应用于位于南非南部和东部的木材干燥窑中的典型烟囱。建立了比例模型并在风洞中进行了精确测试。预测结果优于测试结果。

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