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arXiv 0810.1258cond-mat.soft
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驱动非均匀胶体分散体中流体动力学不稳定性的直接观测

Direct observation of hydrodynamic instabilities in driven non-uniform colloidal dispersions

Adam Wysocki, C. Patrick Royall, Roland G. Winkler, Gerhard Gompper, Hajime Tanaka, Alfons van Blaaderen, Hartmut Löwen

摘要:

一个瑞利-泰勒样的不稳定性的致密胶体层重力下的微流体尺寸的毛细管被认为是。我们访问所有相关的lengthscales与粒子级显微镜和计算机模拟,其中包括远程粒子之间的流体动力学相互作用。通过调节引力驱动力,我们揭示了一种机制,其增长连接到特定波长的波动,非线性斑图形成和随后的扩散为主的弛豫。我们的线性稳定性理论捕获的初始政权,从而预测混合条件,从生物学到纳米技术领域的重要影响。

英文摘要:

A Rayleigh-Taylor-like instability of a dense colloidal layer under gravity in a capillary of microfluidic dimensions is considered. We access all relevant lengthscales with particle-level microscopy and computer simulations which incorporate long-range hydrodynamic interactions between the particles. By tuning the gravitational driving force, we reveal a mechanism whose growth is connected to the fluctuations of specific wavelengths, non-linear pattern formation and subsequent diffusion-dominated relaxation. Our linear stability theory captures the initial regime and thus predicts mixing conditions, with important implications for fields ranging from biology to nanotechnology.

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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