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Evaluation of turbulence around a candle plume using Schlieren photography
Umeå University, Faculty of Science and Technology, Department of Physics.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Schlieren photography is a widely used technique that can visualize the invisible. The aim of this experiment was to construct a z-type Schlieren setup and photograph the turbulence around the flame of candle. Photos taken were analyzed using FracLac, a plugin of ImageJ. Fractal dimension, morphology and lacunarity were measured. Five photos were used to compare the character and the trend. The nonturbulent pattern had the largest fractal dimension, 1.80. The turbulent patterns had a fractal dimension range from 1.4 to 1.6. One of the patterns affected by a strong breeze had a fractal dimension of 1.3. Though the samples were less, it still revealed the tendency based on fractal dimension. The circularity, lacunarity or density were not a good measure to reveal differences of turbulent patterns and nonturbulent patterns.

Place, publisher, year, edition, pages
2015.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-117079OAI: oai:DiVA.org:umu-117079DiVA: diva2:904794
Subject / course
Fysik C - Examensarbete
Available from: 2016-02-19 Created: 2016-02-19 Last updated: 2016-02-19Bibliographically approved

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