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首页> 外文会议>4th International Pipeline Conference, Sep 30-Oct 3, 2002, Calgary >A MAXWELL-STEFAN APPROACH FOR PREDICTING MIXING EFFECTS IN CONTIGUOUS BATCHES OF MULTI-PRODUCT PIPELINES
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A MAXWELL-STEFAN APPROACH FOR PREDICTING MIXING EFFECTS IN CONTIGUOUS BATCHES OF MULTI-PRODUCT PIPELINES

机译：预测多产品管道连续批量中混合效应的麦克斯韦-史蒂芬方法

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摘要

Transient phenomena in the liquid batch interfacial zone are addressed based on: (ⅰ) a reliable compositional description; and (ⅱ) mass transfer modeling. In phase (ⅰ), compositional models are proposed for transported fluids, with parameters estimated by maximum likelihood procedures to match known characterizing data, like distillation curve, density, viscosity and heteroatom weight tractions. In phase (ⅱ), the transient mixing problem is posed on the continua of axial position in the duct, and described by Maxwell-Stefan formalism for multicomponent mass transfer between two contiguous semi-infinite fluids. Turbulent effects are considered on calculation of mass transfer coefficients, and rigorous thermodynamic driving forces are accounted for through component fugacities predicted by equations of state. The model was solved by the finite element method and the resulting set of ordinary differential equations in time was numerically integrated enabling determination of the mixing zone, calculation of property profiles and monitoring loss of product specifications.
机译：液体批处理界面区域中的瞬态现象基于：（ⅰ）可靠的成分描述； （ⅱ）传质建模。在阶段（ⅰ）中，提出了用于输送流体的成分模型，其参数由最大似然程序估算，以匹配已知的特征数据，例如蒸馏曲线，密度，粘度和杂原子重量牵引力。在阶段（ⅱ）中，过渡混合问题存在于管道中轴向位置的连续性上，并由Maxwell-Stefan形式主义描述了两种连续半无限流体之间的多组分传质。在传质系数的计算中考虑了湍流效应，并且通过状态方程预测的组分逸散度来考虑严格的热力学驱动力。通过有限元方法对模型进行求解，并及时对所得的一组常微分方程组进行数值积分，从而确定混合区域，计算性能曲线并监控产品规格的损失。

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