Multifractal characterization of flow in circulating fluidized beds

✍ Scribed by Huang Zhong; Bhavik R. Bakshi; Peijun Jiang; Liang-Shih Fan

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 940 KB
• Volume: 64
• Category: Article
• ISSN: 0923-0467
• DOI: 10.1016/s0923-0467(96)03131-4

✦ Synopsis

The intermittent flow in a circulating fluidized bed is shown to possess a multifractal character. The voidage signals at different solids concentrations and radial positions are characterized by defining an intermittency measure selected from a hierarchy of multifractal exponents. The intermittency profiles based on the raw measured data are consistent with the findings of Brereton and Grace (Chem. Eng. Sci., 48 ( 14) ( 1993) 2565-2572), while the results obtained after removing the contribution from clusters match those of Jiang et al. (Circulating Fluid&d Bed Technology IV, AICE Publications, 1994, pp. 11 l-l 17). The success of multifractal characterization of CFB flow suggests that the cluster motion may behave as a multiplicative cascade process.