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Indexed by:期刊论文

Date of Publication:2011-07-15

Journal:PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS

Included Journals:Scopus、SCIE、EI

Volume:390

Issue:14

Page Number:2678-2685

ISSN No.:0378-4371

Key Words:Dewatered sludges; Indirect drying; Crack distribution; Multifractality

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. (C) 2011 Elsevier B.V. All rights reserved.