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Related Concept Videos

Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
Rapidly Varying Flow01:24

Rapidly Varying Flow

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...
Gradually Varying Flow01:29

Gradually Varying Flow

Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
Streamlines, Streaklines, and Pathlines01:18

Streamlines, Streaklines, and Pathlines

A streamline represents the trajectory that is always tangent to the fluid's velocity vector at any given point. The velocity of a fluid particle is always directed along the streamline, ensuring the particle continuously follows the streamline's path. Streamlines are particularly useful for visualizing the overall direction of flow in a fluid system, and they provide an instantaneous representation of the flow's velocity field. In steady flow, where conditions do not change over time,...

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Related Experiment Video

Updated: Jun 21, 2026

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
09:17

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

Published on: April 23, 2018

Retroreflective shadowgraph technique for large-scale flow visualization.

Michael J Hargather1, Gary S Settles

  • 1Gas Dynamics Laboratory, Pennsylvania State University, 301D Reber Building, University Park, Pennsylvania 16802, USA. mjh340@psu.edu

Applied Optics
|August 4, 2009
PubMed
Summary

This study presents a simple retroreflective shadowgraph technique for visualizing refractive phenomena. The improved method enhances visualization of shock waves and turbulent eddies across various scales.

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Last Updated: Jun 21, 2026

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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Published on: April 23, 2018

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14:25

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Area of Science:

  • Optics and Photonics
  • Fluid Dynamics
  • Experimental Physics

Background:

  • Shadowgraphy is a classical optical technique for visualizing optical inhomogeneities.
  • Edgerton's original method lacked coincident illumination, limiting its robustness.
  • Visualizing dynamic phenomena like shock waves and turbulence requires sensitive and adaptable imaging techniques.

Purpose of the Study:

  • To present a simple, robust retroreflective shadowgraph technique.
  • To improve upon Edgerton's original method with coincident illumination.
  • To demonstrate the system's versatility for visualizing refractive phenomena.

Main Methods:

  • Utilizing a retroreflective screen for efficient light return.
  • Implementing techniques for coincident shadowgram illumination.
  • Exploring optical components and system sensitivity.

Main Results:

  • Demonstrated visualization of shock waves and turbulent eddies.
  • Showcased the technique's effectiveness across a broad range of spatial and temporal scales.
  • Successfully applied the shadowgraph system in diverse experimental settings.

Conclusions:

  • The retroreflective shadowgraph technique offers a simple and robust method for visualizing refractive phenomena.
  • The improved illumination technique enhances sensitivity and applicability.
  • The system is suitable for diverse applications, from laboratory experiments to field tests.