Abstract

This work focuses on the simulation of a fixed bed drying process for wheat grains. A rigorous model based on Fick's law was developed and validated against experimental results. The impact on outputs and computational burden was studied after imposing different simplifying hypotheses. Neglecting internal temperature gradients, the external mass transfer resistance, and the difference between grain and air temperatures saved 18% of execution time with respect to the more rigorous model. These simplifications are adequate for some practical applications. Nevertheless, simulations with a simpler model that only used an average moisture content for the grains yielded worse predicted drying rates.

摘要

这项工作的重点是模拟小麦籽粒的固定床干燥过程。建立了基于菲克定律的严格模型，并针对实验结果进行了验证。在施加不同的简化假设之后，研究了对产出和计算负担的影响。相对于更严格的模型，忽略内部温度梯度，外部传质阻力以及谷物和空气温度之间的差异节省了18％的执行时间。这些简化对于某些实际应用是足够的。尽管如此，使用简单模型（仅使用谷物的平均水分含量）进行的模拟却产生了较差的预测干燥速率。