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Mass transfer coefficients associated with the mixing of a confined gas volume by the random motion of loose spheres

机译:传质系数与通过松散球体的随机运动来混合受限气体体积有关

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This investigation quantifies the change in mass transfer within a confined gas volume subjected to mixing by loose spheres. A cylindrical vessel containing between 1 and 50 Teflon spheres in a tracer gas is vigorously shaken. Extractive sampling provides time histories of tracer gas concentrations extracted from the vessel. Fitting the results from a simple 1-D mass transfer model to the experimental data yields an effective mass transfer coefficient k′ for each experimental condition. Compared to diffusive mass transfer where k′ = D_(ab) = 7.58 x 10~(-6)m~2/s, k′ exhibits a cubic dependency on the number of spheres with a maximum at 17 spheres where k′ = 3.5 x 10~(-3) m~2/s.
机译:该研究量化了在受限气体体积内传质的变化,该受限气体体积受到松散球体的混合。剧烈摇动在示踪气体中包含1至50个Teflon球的圆柱形容器。提取采样提供了从容器提取的示踪气体浓度的时间历史记录。将简单的一维传质模型的结果与实验数据进行拟合可得出每种实验条件的有效传质系数k'。与k'= D_(ab)= 7.58 x 10〜(-6)m〜2 / s的扩散传质相比,k'对球数量具有三次方依赖性,其中最大球数量为17个球,其中k'= 3.5 x 10〜(-3)m〜2 / s

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