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Related Concept Videos

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...
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...
Uniform Depth Channel Flow01:27

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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...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
Irrotational Flow01:28

Irrotational Flow

Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:

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Related Experiment Video

Updated: Jun 7, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
12:26

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Refractive surface flow visualization using image processing.

D F Britton, L M Smith

    Applied Optics
    |November 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new free-surface visualization technique effectively maps submerged object wakes. This method uses image processing to detail surface deformation, aiding in object detection and tracking in water tunnels.

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    Published on: March 6, 2013

    Area of Science:

    • Fluid dynamics
    • Hydrodynamics
    • Optical measurement techniques

    Background:

    • Wake-free-surface interaction is crucial for detecting submerged objects.
    • Existing methods for visualizing surface disturbances are limited.
    • Controlled water-tunnel experiments are essential for studying fluid phenomena.

    Purpose of the Study:

    • To develop and verify a simple, effective free-surface visualization technique.
    • To demonstrate the applicability of the method in controlled water-tunnel experiments.
    • To analyze the wake-free-surface interaction for submerged object detection.

    Main Methods:

    • Acquisition of digital images of a sinusoidal grid viewed through surface disturbances.
    • Application of image-processing techniques, specifically phase demodulation.
    • Experimental determination of optimal digital filter specifications and grid frequencies.

    Main Results:

    • The technique successfully visualizes surface deformation in a gray-scale format.
    • The resulting images clearly detail the outline, location, and extent of surface disturbances.
    • Optimal parameters were identified for various surface-flow conditions.

    Conclusions:

    • The developed free-surface visualization technique is effective and applicable for water-tunnel experiments.
    • The method provides detailed information about surface deformation for improved submerged object analysis.
    • Further research can optimize parameters for diverse flow conditions and applications.