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首页> 外文期刊>Water resources research >Mass transfer between a multicomponent trapped gas phase and a mobile water phase: Experiment and theory
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Mass transfer between a multicomponent trapped gas phase and a mobile water phase: Experiment and theory

机译：多组分截留气相和流动水相之间的传质：实验和理论

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Gas tracer experiments were carried out in dynamically compressed sediments to investigate the mass transfer between a trapped multicomponent gas phase and a mobile water phase. The saturation state of the column was characterized by three independent methods: (1) by gravimetric measurements, (2) by bromide tracer tests, and (3) by hydraulic conductivity measurements. For inverse modeling a new kinetic model was developed allowing volume change of the entrapped gas. The new kinetic model consistently explains oxygen elution curves, the time evolution of the integral gas saturation, and integral hydraulic conductivity. The sensitivity of three different velocity-dependent mass transfer correlations to the dissolution process was investigated: (1) a classical square-root, single-sphere correlation, Sh ～ Pe~(0.5), (2) a multisphere correlation, Sh ～ Pe~n (n = 0.5-1.0), and (3) an empirical correlation, Sh ～ Pe~(0.8). It was found that all correlations yield nearly the same elution curves for 10 gas tracer experiments with three different two-component gas phases: O_2/He, O_2/N_2, and O_2/Ar and for different flow velocities ranging from 5 to 20 m d~(-1). For all gas tracer experiments a distinct minimum of the longitudinal dispersivity was found during gas dissolution, i.e., in the unsaturated state. For the saturated state we found that the experimental values could be described by Saffman's theory: D_p ∝ Pe In (Pe) with a normalized mean square root error of 6%.
机译：在动态压缩的沉积物中进行了气体示踪剂实验，以研究被捕集的多组分气相与流动水相之间的传质。色谱柱的饱和状态通过三种独立的方法进行表征：（1）通过重量分析法测量；（2）通过溴化物示踪剂测试；（3）通过水力传导率测量。对于逆模型，开发了一种新的动力学模型，允许截留气体的体积变化。新的动力学模型始终如一地解释了氧气洗脱曲线，整体气体饱和度的时间演变以及整体的水力传导率。研究了三种不同的速度相关传质相关性对溶解过程的敏感性：（1）经典平方根，单球相关性Sh〜Pe〜（0.5），（2）多球相关性Sh〜Pe 〜n（n = 0.5-1.0），和（3）经验相关，Sh〜Pe〜（0.8）。结果发现，对于10种气体示踪剂实验，在三种不同的两组分气相：O_2 / He，O_2 / N_2和O_2 / Ar以及流速范围从5到20 md〜的情况下，所有相关性均产生几乎相同的洗脱曲线。 （-1）。对于所有气体示踪剂实验，在气体溶解期间，即在不饱和状态下，发现纵向分散性的最小值明显。对于饱和状态，我们发现实验值可以用Saffman理论描述：D_p ∝ Pe In（Pe），归一化均方根误差为6％。

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