A Pore-Scale Computational Model for the Simulation of Mass Transfer From Nonaqueous Phase Liquids

用于模拟非水相液体传质的孔隙尺度计算模型

• 批准号: 9218803
• 负责人: Michael Celia
• 金额: $ 27.5万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1997-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218803&HistoricalAwards=false
• 关键词: Pore; Scale; Computational; Model; Simulation

This study will provide a physically-based description of the mass transfer process in multi-fluid porous media. By developing a pore-scale miscible transport model and coupling it with existing pore-scale models for fluid-fluid displacement, a complete and self-consistent mathematical description of capillary displacement, fluid motion, interphase mass transfer, and miscible contaminant transport will be obtained. With this model, mass transfer coefficients will be predicted as functions of interfacial areas, which will be directly related to fluid saturations. comparison of model results to a number of reported laboratory experiments involving non-aqueous phase liquid (NAPL) dissolution will be used to validate the model. Correlations between predicted mass transfer coefficients and capillary pressure-saturation-relative permeability relations will be explored. The model will be used to investigate the functional dependence between dispersivities and fluid saturations, including examination of possible hysteresis. Finally, the influence of material heterogeneity will be explored, with an emphasis on determination of effective mass transfer coefficients and macrodispersivities. The practical utility of the results will be demonstrated by coupling the continuum-scale transport properties predicted by the pore-scale models to more traditional continuum-scale multi-phase simulators.

本研究将提供多流体多孔介质中传质过程的物理描述。通过建立孔隙尺度的混相输运模型，并将其与现有的流体-流体位移孔隙尺度模型耦合，将获得毛细管位移、流体运动、相间传质和混相污染物输运的完整且自一致的数学描述。使用该模型，传质系数将作为界面面积的函数进行预测，而界面面积与流体饱和度直接相关。将模型结果与一些报道的涉及非水相液体（NAPL）溶解的实验室实验进行比较，以验证模型。将探讨预测传质系数与毛细管压力-饱和-相对渗透率关系之间的关系。该模型将用于研究色散和流体饱和度之间的功能依赖关系，包括检查可能的滞后。最后，将探讨材料非均质性的影响，重点是有效传质系数和宏观分散性的确定。通过将孔隙尺度模型预测的连续尺度输运性质与更传统的连续尺度多相模拟器耦合，将证明结果的实际效用。