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arXiv 1702.01563physics.flu-dyn
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活性多孔介质中的瞬态流动

Transient flows in active porous media

Lefteris I. Kosmidis, Kaare H. Jensen

摘要:

刺激响应材料,改变其形状,以响应环境条件的变化-如溶质浓度,温度,pH值和应力-在自然界和技术中广泛存在。应用包括用于过滤和流量控制的微米和纳米多孔材料。引起内体积改变的物理化学机制已被广泛研究。然而,诱导体积变化和溶质通过多孔材料的传输之间的耦合还没有很好地理解。在这里,我们考虑通过一个小通道连接两个大水库的平流和扩散运输。一段刺激响应材料调节通道渗透性,这是局部溶质浓度的函数。我们推导出一个精确的解耦合运输问题,并证明存在的一个流态中,通过阻尼振荡的平衡浓度值周围达到稳定状态。最后讨论了实验观测的可行性。请注意,该版本的论文尚未经过正式的同行评审,修订或被期刊接受。

英文摘要:

Stimuli-responsive materials that modify their shape in response to changes in environmental conditions -- such as solute concentration, temperature, pH, and stress -- are widespread in nature and technology. Applications include micro- and nanoporous materials used in filtration and flow control. The physiochemical mechanisms that induce internal volume modifications have been widely studies. The coupling between induced volume changes and solute transport through porous materials, however, is not well understood. Here, we consider advective and diffusive transport through a small channel linking two large reservoirs. A section of stimulus-responsive material regulates the channel permeability, which is a function of the local solute concentration. We derive an exact solution to the coupled transport problem and demonstrate the existence of a flow regime in which the steady state is reached via a damped oscillation around the equilibrium concentration value. Finally, the feasibility of an experimental observation of the phenomena is discussed. Please note that this version of the paper has not been formally peer reviewed, revised or accepted by a journal.

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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