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Multifractality analysis of crack images from indirect thermal drying of thin-film dewatered sludge

Author

Listed:
  • Wang, Weiyun
  • Li, Aimin
  • Zhang, Xiaomin
  • Yin, Yulei

Abstract

Crack formation is inevitable during sludge drying because of the existence of uneven thermal stress. Experiments have been conducted to study crack pattern formation in thin film sludge. Crack images show that the thinner the sewage sludge film, the more even the crack distribution. The crack changes from a flaky texture to a banded structure with increasing thickness. Multifractal methods are proposed to analyze the crack image of four different thicknesses of dried sludge. Several parameters are conducted for quantification of the crack image and the results indicate that the width of spectra increases with thicker sludge film, that is to say, nonunifromity of crack distribution increases with increasing thickness, which proves that the multifractal method is sensitive enough to quantify the crack distribution and can be seen as a new approach for the changing research of crack images of sewage sludge drying.

Suggested Citation

  • Wang, Weiyun & Li, Aimin & Zhang, Xiaomin & Yin, Yulei, 2011. "Multifractality analysis of crack images from indirect thermal drying of thin-film dewatered sludge," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 390(14), pages 2678-2685.
    • Handle: RePEc:eee:phsmap:v:390:y:2011:i:14:p:2678-2685
    DOI: 10.1016/j.physa.2011.03.011
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    References listed on IDEAS

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    1. Moktadir, Z. & Kraft, M. & Wensink, H., 2008. "Multifractal properties of Pyrex and silicon surfaces blasted with sharp particles," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 387(8), pages 2083-2090.
    2. Yang, Xiaodong & Ning, Xinbao & Wang, Jun, 2007. "Multifractal analysis of human synchronous 12-lead ECG signals using multiple scale factors," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 384(2), pages 413-422.
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