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Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
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Laminar flow occurs when a fluid moves smoothly in parallel layers with minimal mixing and turbulence. In fluid mechanics, ensuring laminar flow within a pipe is essential for precise control of flow characteristics, especially in engineering applications. The key factor in determining whether flow remains laminar is the Reynolds number, a dimensionless quantity that depends on the fluid's velocity, density, viscosity, and the pipe's diameter. A Reynolds number of 2100 or lower...
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Pipe flow refers to the movement of fluids within fully enclosed conduits, typically cylindrical in shape, such as water pipes or hydraulic hoses. These conduits are designed to withstand high-pressure gradients that drive fluid movement, contrasting with open-channel flows, where gravity is the primary driving force. Rectangular conduits, like air conditioning and heating ducts, generally operate at lower pressures and are less suited for high-pressure applications.
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Related Experiment Video

Updated: Sep 16, 2025

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Pulsatile pipe flow experiment to study particle-fluid interactions using Lagrangian flow measurements.

Bastian Bäuerlein1,2,3,4,5, Kerstin Avila1,2,3,4,5

  • 1Institute of Physics, University of Oldenburg, Ammerländer Heerstrasse. 114-118, 26129 Oldenburg, Germany.

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Summary
This summary is machine-generated.

This study introduces a novel pipe flow experiment for tracking particle and fluid motion simultaneously. It enables detailed analysis of particle-laden flows, crucial for understanding complex fluid dynamics and validating simulations.

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Area of Science:

  • Fluid Dynamics
  • Multiphase Flow
  • Experimental Physics

Background:

  • Simultaneously tracking particle and fluid motion is critical for understanding their interaction dynamics.
  • Existing experimental methods face challenges in capturing complex, three-dimensional particle-laden flows.

Purpose of the Study:

  • To present a novel experimental setup for comprehensive 3D measurements of particle-laden flow in a pipe.
  • To demonstrate the capability of advanced particle tracking algorithms for analyzing complex flow dynamics.
  • To provide high-fidelity data for validating multiphase flow simulations and understanding turbulence transitions.

Main Methods:

  • Utilized a novel pipe flow experiment (28 mm diameter, up to 20 m length) with a piston-driven system for steady and pulsatile flows.
  • Employed three-dimensional Lagrangian particle tracking with the Shake-The-Box algorithm to capture particle position, velocity, and rotation.
  • Incorporated single-camera particle migration detection and high-resolution differential pressure measurements.

Main Results:

  • Achieved simultaneous 3D tracking of fluid flow and hydrogel particle dynamics, including rotational motion.
  • Explored Reynolds numbers from 50 to 7400, covering laminar to turbulent regimes.
  • Demonstrated the system's suitability for studying physiological pulsatile waveforms and particle-induced turbulence transitions.

Conclusions:

  • The developed experimental method offers unprecedented potential for analyzing spatiotemporally complex particle-laden flows.
  • The generated datasets are valuable for validating four-way coupling in multiphase flow simulations.
  • This research provides critical insights into particle effects on turbulence and flow behavior.