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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Updated: Sep 9, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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使用静态波声流体的连续和可调节的滴滴分裂

Duo Xu1,2, Yongmao Pei1, Wei Qiu2

  • 1State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, China. peiym@pku.edu.cn.

Lab on a chip
|September 5, 2025
PubMed
概括

一种新的声学方法可以在微流体中精确地分离液滴,克服传统技术的局限性. 这种高通量方法允许对高级应用程序进行受控的滴滴处理.

科学领域:

  • 微流体学
  • 声学操纵
  • 生物技术

背景情况:

  • 在单细胞分析和材料制造等微流体应用中,滴滴分裂至关重要.
  • 传统的滴滴分离方法在控制分离比率和吞吐量方面存在局限性.
  • 现有的有效方法通常是复杂的,缓慢的,或特定于某些液滴类型.

研究的目的:

  • 展示使用声场进行滴滴分裂的简单有效方法.
  • 研究声滴分裂的基本机制.
  • 展示高吞吐量和可控滴滴操纵的潜力.

主要方法:

  • 在微通道中激发一维静止波场.
  • 理论分析和数值模拟以了解分裂机制.
  • 高速成像以观察滴滴分裂的动态.

主要成果:

  • 通过压力节点附近的对立声辐射压力实现滴滴分裂.
  • 分裂过程涉及分别的,全伸和分裂模式,在1 ms内完成.
  • 在可控制的比率下,在高达161μL分1的流量下证明了高吞吐量滴滴分裂.

结论:

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  • 声学静止波场提供了一种简单,高效,高通量的液滴分裂方法.
  • 这种技术可以精确地控制微流体应用的液滴大小和操作.
  • 该方法通过选择性颗粒操纵扩展了微反应和药物输送的能力.