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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat and mass transfer during drying of granular products -- simulation with convective and conductive boundary conditions
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Heat and mass transfer during drying of granular products -- simulation with convective and conductive boundary conditions

机译：颗粒产品干燥过程中的传热和传质-对流和传导边界条件的模拟

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摘要

Numerical simulation of grain drying in a vertical cylindrical bed has been carried out with specific boundary conditionst evaporation. which occurs with forced air flowing through the bed, is intensified with a conductive heat flux from the wall. We consider two mathematical models of heat and mass transfer through granular medium: (two temperature model (No Local Temperature Equilibrium Model: NLTEModel) and one temperature model (Local Temperature Equilibrium Model: LTEModel). The air-grain mass transfer is expressed with a drying rate equation outcome from experiments. The resolution of the equations set is carried out. using a finite volume method. Different effects, such as the effect of the porosity variation on energy and mass transport, are discussed. Sensitivity to external conditions is determined. Finally, validily of local thermal assumption is examined.
机译：在特定的边界条件t蒸发条件下，对立式圆柱床中的谷物干燥进行了数值模拟。强迫空气流过床时会发生这种情况，而这种热量会通过来自壁的传导热通量而增强。我们考虑了两个通过颗粒介质传热和传质的数学模型：（两个温度模型（无局部温度平衡模型：NLTEModel）和一个温度模型（局部温度平衡模型：LTEModel）。空气颗粒传质用a表示干燥速率方程的实验结果，使用有限体积法对方程组进行了解析，讨论了不同的影响，例如孔隙率变化对能量和质量输运的影响，确定了对外界条件的敏感性。最后，检验局部热假设的有效性。

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