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An exact solution of a limit case Stefan problem governed by a fractional diffusion equation

机译:由分数阶扩散方程控制的极限情形Stefan问题的精确解

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摘要

An anomalous diffusion version of a limit Stefan melting problem is posed. In this problem, the governing equation includes a fractional time derivative of order 0 < β ≤ 1 and a fractional space derivative for the flux of order 0 < α ≤ 1. Solution of this fractional Stefan problem predicts that the melt front advance as s = t~γ,γ= β/(α+1). This result is consistent with fractional diffusion theory and through appropriate choice of the order of the time and space derivatives, is able to recover both sub-diffusion and super-diffusion behaviors for the melt front advance.
机译:提出了极限Stefan熔化问题的反常扩散版本。在此问题中,控制方程包含0 <β≤1阶的分数时间导数和0 <α≤1阶通量的分数空间导数。该分数Stefan问题的解决方案预测,随着s = t〜γ,γ=β/(α+ 1)。该结果与分数扩散理论相符,并且通过适当选择时间和空间导数的阶数,能够恢复熔体前沿推进的子扩散和超扩散行为。

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