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Related Concept Videos

Flame Photometry: Overview01:02

Flame Photometry: Overview

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

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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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Plane Potential Flows01:23

Plane Potential Flows

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Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform...
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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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Flame Photometry: Lab01:16

Flame Photometry: Lab

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Related Experiment Video

Updated: Jul 4, 2025

Determining 3D Flow Fields via Multi-camera Light Field Imaging
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Simultaneous two-plane flame front detection using PIV based on defocusing.

Qichi He, Christopher Willman, Benjamin A O Williams

    Optics Letters
    |February 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method for simultaneous two-plane flame front detection using particle image velocimetry (PIV) and an image splitter. This technique effectively captures turbulent flame fronts on two planes for combustion analysis.

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    Related Experiment Videos

    Last Updated: Jul 4, 2025

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    Area of Science:

    • Combustion science
    • Optical diagnostics
    • Fluid dynamics

    Background:

    • Accurate flame front detection is crucial for understanding combustion processes.
    • Existing methods often lack the ability to capture multi-plane flame dynamics simultaneously.
    • Particle Image Velocimetry (PIV) is a standard technique for flow visualization.

    Purpose of the Study:

    • To develop a simultaneous two-plane flame front detection method.
    • To enhance the capabilities of standard single-camera PIV systems.
    • To enable detailed analysis of turbulent flame structures in three dimensions.

    Main Methods:

    • Utilized a standard single-camera PIV system.
    • Incorporated an inexpensive, compact image splitting device to capture two depth-offset planes.
    • Employed a shallow depth of field to ensure focus on distinct planes.
    • Developed a novel two-step filtering process to remove out-of-focus images.

    Main Results:

    • Successfully detected turbulent flame fronts on two separate planes simultaneously.
    • Effectively removed out-of-focus particle images using the developed filtering technique.
    • Maintained high in-plane spatial resolution comparable to single-plane measurements.

    Conclusions:

    • The proposed method enables simultaneous multi-plane flame front detection.
    • This technique is suitable for practical combustion devices with limited optical access.
    • It can be combined with polarization/wavelength discrimination for advanced flame reconstruction.