微通道中布朗悬浮液的长寿命和不稳定模式
Long-lived and unstable modes of Brownian suspensions in microchannels
摘要：
本文研究了微通道中含球形颗粒的布朗悬浮液在压力驱动下的低雷诺数流动的稳定性。我们发现两个一般家庭的稳定/不稳定的模式：（i）退化模式的对称和反对称模式;（ii）单一的模式，无论是对称或反对称。简并模式的浓度分布在通道壁附近有很强的峰值，而单模在那里减弱。一旦兴奋，这两个家族都可以通过高速成像检测到。我们发现，不稳定的模式发生在浓度悬浮液的速度分布是足够平坦的通道中心线附近。增长的不稳定模式的模式表明，它们被触发，由于布朗迁移的颗粒之间的中央散装移动几乎恒定的速度，和高度剪切的低速区域附近的壁。模式被放大，因为剪切诱导的扩散不能有效地分散粒子从扰动速度场的空腔。
英文摘要：
We investigate the stability of the pressure-driven, low-Reynolds flow of Brownian suspensions with spherical particles in microchannels. We find two general families of stable/unstable modes: (i) degenerate modes with symmetric and anti-symmetric patterns; (ii) single modes that are either symmetric or anti-symmetric. The concentration profiles of degenerate modes have strong peaks near the channel walls, while single modes diminish there. Once excited, both families would be detectable through high-speed imaging. We find that unstable modes occur in concentrated suspensions whose velocity profiles are sufficiently flattened near the channel centreline. The patterns of growing unstable modes suggest that they are triggered due to Brownian migration of particles between the central bulk that moves with an almost constant velocity, and highly-sheared low-velocity region near the wall. Modes are amplified because shear-induced diffusion cannot efficiently disperse particles from the cavities of the perturbed velocity field.
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。
