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arXiv 2302.14730physics.flu-dyn
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径向 Hele-Shaw 腔中压缩驱动的黏性指进

Compression-driven viscous fingering in a radial Hele-Shaw cell

Callum Cuttle, Liam C. Morrow, Christopher W. MacMinn

AI总结:

本文研究径向 Hele-Shaw 腔中气体压缩性对黏性指进的影响,提出压缩数这一新无量纲参数,并通过理论分析、实验与非线性模拟证明增大压缩数可延迟指进发生并降低其严重程度。

摘要:

气体在 Hele-Shaw 腔中驱替黏性液体是一个经典问题。气液界面在流体动力学上是不稳定的,会形成引人注目的指状图案,数十年来一直吸引着研究兴趣。通常,气相和液相都被视为不可压缩的,毛细数是决定不稳定性严重程度的关键参数。本文考虑由气体储层稳定压缩驱动的径向外向驱替。由于气体的可压缩性,相应的注气速率是非稳态的。我们确定了第二个无量纲参数,即压缩数,它在指进图案的发展中起着重要作用。我们使用轴对称模型研究压缩数对注气速率和气体压力非稳态演化的影响。我们利用线性稳定性分析表明,相对于相应的不可压缩情形,增大压缩数会延迟指状结构开始发展的时刻。最后,我们展示并比较了在广泛的毛细数和压缩数范围内进行的一系列实验和完全非线性模拟。这些结果表明,在高毛细数下,增大压缩数会系统性地降低指进图案的严重程度。我们的结果为黏性指进的实验与模拟提供了前所未有的对比,全面理解了可压缩性在不稳定气液驱替流动中的作用,并为控制指进图案发展的新机制提供了见解。

英文摘要:

The displacement of a viscous liquid by a gas within a Hele-Shaw cell is a classical problem. The gas-liquid interface is hydrodynamically unstable, forming striking finger-like patterns that have attracted research interest for decades. Generally, both the gas and liquid phases are taken to be incompressible, with the capillary number being the key parameter that determines the severity of the instability. Here, we consider a radially outward displacement driven by the steady compression of a gas reservoir. The associated gas-injection rate is then unsteady due to the compressibility of the gas. We identify a second nondimensional parameter, the compressibility number, that plays a strong role in the development of the fingering pattern. We use an axisymmetric model to study the impact of compressibility number on the unsteady evolution of injection rate and gas pressure. We use linear stability analysis to show that increasing the compressibility number delays the onset of finger development relative to the corresponding incompressible case. Finally, we present and compare a series of experiments and fully nonlinear simulations over a broad range of capillary and compressibility numbers. These results show that increasing the compressibility number systematically decreases the severity of the fingering pattern at high capillary number. Our results provide an unprecedented comparison of experiments with simulations for viscous fingering, a comprehensive understanding of the role of compressibility in unstable gas-liquid displacement flows, and insight into a new mechanism for controlling the development of fingering patterns.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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