本文建立了建材有机挥发性化合物(VOCs)通用散发模型,并给出了其分析解.通过此分析解可以计算出VOCs扩散传质速率和扩散量,以及建筑材料内VOCs瞬时浓度分布.通过分析发现:(1)无量纲扩散量只是Bim(传质毕渥数)、Fom(传质付立叶数)、和K(分离常数)的函数;(2)Bim/K存在临界值,当Bim/K大于此临界值时,与内部扩散传质质阻相比外部对流传质质阻可以忽略.文章对该简化进行了误差分析,给出了保证相对误差为5%的Fom与Bim/K临界值的拟合关系式,并通过实例进行了验证.
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