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Mixing-driven equilibrium reactions in multidimensional fractional advection-dispersion systems

机译:多维分数对流-弥散系统中混合驱动的平衡反应

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摘要

We study instantaneous, mixing-driven, bimolecular equilibrium reactions in a system where transport is governed by a multidimensional space fractional dispersion equation. The superdiffusive, nonlocal nature of the system causes the location and magnitude of reactions that take place to change significantly from a classical Fickian diffusion model. In particular, regions where reaction rates would be zero for the Fickian case become regions where the maximum reaction rate occurs when anomalous dispersion operates. We also study a global metric of mixing in the system, the scalar dissipation rate and compute its asymptotic scaling rates analytically. The scalar dissipation rate scales asymptotically as t-~((d+α)/α), where d is the number of spatial dimensions and α is the fractional derivative exponent.
机译:我们研究了一个由多维空间分数弥散方程控制输运的系统中的瞬时,混合驱动,双分子平衡反应。系统的超扩散,非局部性质导致发生的反应的位置和大小与经典的Fickian扩散模型相比发生显着变化。尤其是,对于Fickian情况,反应速率将为零的区域将成为在异常分散操作时发生最大反应速率的区域。我们还研究了系统中混合的全局度量,标量耗散率,并通过分析计算了其渐近定标率。标量耗散率渐近地缩放为t-〜((d +α)/α),其中d是空间维数,而α是分数导数指数。

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