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Related Concept Videos

Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
Steady, Laminar Flow in Circular Tubes01:23

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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
Steady, Laminar Flow Between Parallel Plates01:17

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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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Related Experiment Video

Updated: Jun 28, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Published on: August 27, 2013

Exploiting the hydrodynamic aspects of continuous-flow systems.

A Ríos1, M Valcárcel

  • 1Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Córdoba, Spain.

Talanta
|December 1, 1991
PubMed
Summary
This summary is machine-generated.

This study explores hydrodynamic flow manipulation in unsegmented flow systems for enhanced analytical capabilities. Techniques like stopped-flow and flow reversal offer new possibilities for chemical analysis.

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Area of Science:

  • Analytical Chemistry
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Unsegmented flow systems offer unique advantages for chemical analysis.
  • Hydrodynamic properties are crucial for optimizing flow-based analytical methods.

Purpose of the Study:

  • To present an overview of the analytical potential of hydrodynamic aspects in unsegmented flow systems.
  • To describe various flow manipulation techniques for analytical applications.

Main Methods:

  • Stopped-flow methodologies
  • Intermittent pumping
  • Selecting-diverting carrier (reagent) streams
  • Open-closed flow systems
  • Flow reversal
  • Flow gradient

Main Results:

  • Detailed description of various flow manipulation techniques.
  • Highlighting the analytical potential unlocked by controlling flow dynamics.
  • Demonstration of how different hydrodynamic approaches can be applied.

Conclusions:

  • Hydrodynamic manipulation significantly enhances the analytical capabilities of unsegmented flow systems.
  • The described techniques provide a versatile toolkit for optimizing flow-based analyses.
  • Further exploration of these methods can lead to novel analytical solutions.