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Related Concept Videos

Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

385
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...
385
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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Updated: Sep 11, 2025

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Improving stitching interferometry measurements by a continuous airflow.

Albert Van Eeckhout1, Guillem Alvarez1, Igors Sics1

  • 1ALBA Synchrotron Light Source, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Barcelona, Spain.

The Review of Scientific Instruments
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This summary is machine-generated.

A fan

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Area of Science:

  • Optical metrology
  • Surface metrology
  • Interferometry

Background:

  • Stitching interferometry systems, like ALBA's Fizeau interferometer, are susceptible to environmental noise, especially for long mirrors.
  • Averaging measurements reduces noise but increases measurement time and uncertainty.
  • Reducing environmental noise is crucial for accurate long mirror metrology.

Purpose of the Study:

  • To investigate the impact of fan-generated airflow on reducing environmental noise in stitching interferometry.
  • To assess the effect of airflow on the repeatability of Fizeau surface reconstruction.
  • To determine if airflow can improve measurement accuracy and reduce uncertainty.

Main Methods:

  • Frequency analysis of interferometric data.
  • Computational fluid dynamics (CFD) simulations.
  • Replication of ALBA's stitching measurement procedure on a 550 mm x-ray mirror section.

Main Results:

  • Fan-generated airflow was evaluated for its effect on Fizeau surface reconstruction repeatability.
  • Frequency analysis revealed the impact of airflow on interferometric signal stability.
  • CFD simulations provided insights into airflow dynamics and their influence on measurement stability.

Conclusions:

  • Fan-generated airflow can mitigate environmental noise in stitching interferometry.
  • Employing a fan with rotating blades can improve measurement repeatability for long mirrors.
  • This method offers a way to balance measurement time and uncertainty in optical metrology.