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Related Concept Videos

Flame Photometry: Overview01:02

Flame Photometry: Overview

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...
Flame Photometry: Lab01:16

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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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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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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the streamlines...

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Related Experiment Video

Updated: Jun 22, 2026

High-speed Particle Image Velocimetry Near Surfaces
11:59

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Published on: June 24, 2013

Flame front detection and characterization using conditioned particle image velocimetry (CPIV).

Sebastian Pfadler, Frank Beyrau, Alfred Leipertz

    Optics Express
    |June 25, 2009
    PubMed
    Summary

    Conditioned Particle Image Velocimetry (CPIV) accurately determines turbulent premixed flame front positions. This technique, based on particle density changes, aligns well with heat release and OH measurements, validating its use in combustion research.

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    Area of Science:

    • Combustion Science
    • Fluid Dynamics
    • Chemical Engineering

    Background:

    • Accurate flame front detection is crucial for understanding turbulent premixed flames.
    • Traditional methods can be complex or limited in turbulent environments.
    • Conditioned Particle Image Velocimetry (CPIV) offers a novel approach based on optical properties.

    Purpose of the Study:

    • To evaluate the efficacy of CPIV in determining the precise flame front position in turbulent premixed flames.
    • To compare CPIV-derived flame front data with established measurement techniques.
    • To assess the impact of CPIV on derived flame dynamics parameters.

    Main Methods:

    • Utilizing Conditioned Particle Image Velocimetry (CPIV) to analyze particle density variations.
    • Employing simultaneous heat release measurements for validation.
    • Conducting planar Laser-Induced Fluorescence (LIF) measurements of OH and CH2O radicals.

    Main Results:

    • CPIV successfully identified flame front positions comparable to heat release and OH distribution peaks.
    • Statistical flame dynamics quantities (turbulent flux, surface density, curvature) showed minimal discrepancies between methods.
    • The study confirmed CPIV's capability to accurately map flame front behavior.

    Conclusions:

    • CPIV is a reliable technique for deriving actual flame front positions in turbulent premixed flames.
    • The method provides results consistent with established combustion diagnostics.
    • CPIV offers a valuable tool for detailed analysis of turbulent flame dynamics.