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Related Concept Videos

Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

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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...
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Uniform Depth Channel Flow: Problem Solving01:18

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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...
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Simultaneous Schlieren-Shadowgraph Visualization and Temperature Measurement Fields of Fluid Flow Using One Color CCD

Adrián Martínez-González1, David Moreno-Hernández2, Miguel León-Rodríguez3

  • 1Departamento de Ingeniería Robótica, Universidad Politécnica del Bicentenario, Carr. Silao-Romita Km 2, San Juan de los Duran, Silao 36283, Guanajuato, Mexico.

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Summary
This summary is machine-generated.

This study introduces an optical system using a color camera, RGB LED, and filters to capture fluid flow images and measure temperature fields. The system achieves a temperature resolution of approximately one degree Celsius.

Keywords:
Schlieren techniquescrosstalkmeasure temperatureshadowgraph

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Area of Science:

  • Fluid dynamics
  • Optical physics
  • Thermal imaging

Background:

  • Visualizing fluid flow often requires complex optical setups.
  • Measuring temperature fields in fluids is crucial for many applications.
  • Existing methods may lack the ability to capture multiple flow variables simultaneously.

Purpose of the Study:

  • To develop an integrated optical system for simultaneous visualization of fluid flow variables and temperature measurement.
  • To utilize a single snapshot to acquire shadowgraph and two-direction sensitivity Schlieren images.
  • To measure fluid temperature fields using the obtained Schlieren images.

Main Methods:

  • Employed an optical system comprising an RGB Light Emitting Diode (LED), shortpass and longpass ultra-thin filters as knife edges, and a color digital camera.
  • Recorded shadowgraph and two-direction sensitivity Schlieren images in a single snapshot.
  • Applied crosstalk correction to the shadowgraph images.
  • Utilized Schlieren images for temperature field measurements.

Main Results:

  • Successfully captured shadowgraph and Schlieren images simultaneously.
  • Identified and corrected crosstalk effects in shadowgraph images.
  • Achieved a temperature measurement resolution of approximately one degree Celsius.
  • Demonstrated the capability of the optical system for fluid flow visualization and thermal analysis.

Conclusions:

  • The developed optical system offers a streamlined approach to fluid flow analysis.
  • Simultaneous acquisition of shadowgraph and Schlieren data is feasible with the proposed setup.
  • The system provides quantitative temperature measurements with good resolution, valuable for thermal studies.