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Related Concept Videos

Accelerating Fluids01:17

Accelerating Fluids

When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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

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Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging
05:45

Uncovering Hidden Dynamics of Natural Photonic Structures Using Holographic Imaging

Published on: March 31, 2022

High-performance holographic technologies for fluid-dynamics experiments.

Sergei S Orlov1, Snezhana I Abarzhi, Se Baek Oh

  • 1Department of Electric Engineering, Stanford University, Stanford, CA, USA. orlov@stanford.edu

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|March 10, 2010
PubMed
Summary

High-performance digital holography advances fluid dynamics research by enabling precise measurements of complex turbulent flows. This technology offers high resolution and data rates for detailed flow analysis and comparison with simulations.

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Area of Science:

  • Fluid Dynamics
  • Experimental Physics
  • Optical Measurement Techniques

Background:

  • Modern experimental fluid dynamics requires enhanced precision, dynamic range, and data acquisition for studying complex turbulent flows.
  • Accurate comparisons between experimental data, theoretical models, and numerical simulations are crucial for advancing the field.
  • High Reynolds number flows present significant challenges for traditional measurement techniques.

Purpose of the Study:

  • To introduce high-performance digital holography as a novel technology for fluid dynamics research.
  • To demonstrate the capability of this technology in achieving high space-time resolutions and bandwidth for turbulent flow analysis.
  • To highlight its application in quantitative description of fluid flows, including multi-phase and unsteady conditions.

Main Methods:

  • Utilizing state-of-the-art motion control, electronics, and optical imaging.
  • Implementing in-line digital holographic technology for flow diagnostics.
  • Achieving high Reynolds number ( > 10^7) turbulent flows at laboratory scale.
  • Employing high data rates (> 1000 fps) for capturing dynamic flow phenomena.

Main Results:

  • Complete three-dimensional mapping of flow velocity and density fields.
  • High spatial resolution (1-10 microm) and temporal resolution (nanoseconds).
  • Accurate quantitative description of fluid flows, including multi-phase and unsteady scenarios.
  • Enabling the study of turbulent flows with very high Reynolds numbers.

Conclusions:

  • High-performance digital holography significantly enhances experimental capabilities in fluid dynamics.
  • This technology facilitates detailed analysis of complex flows, aiding fundamental research.
  • It enables robust validation of theoretical and numerical simulation approaches in fluid dynamics.