Experimental investigation into transient pressure pulses during pneumatic conveying of fine powders using Shannon entropy |
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| Affiliation: | 1. Beijing Key Laboratory of Process Fluid Filtration and Separation, College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China;2. College of Energy, Xiamen University, Xiamen 361005, China;1. University of South Australia, Future Industries Institute, Mawson Lakes Campus, Mawson Lakes, Adelaide, South Australia 5095, Australia;2. Current affiliation: School of Engineering Edith Cowan University, 270 Joondalup Drive, Joondalup 6027, Australia;1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China;1. Faculty of Mechanical Engineering, Semnan University, Iran;2. Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Iran;1. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Gamma Technologies, LLC., 601 Oakmont Ln, Suite 220, Westmont, IL 60559, USA;2. Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA;3. Wanger Institute for Sustainable Energy Research, Illinois Institute of Technology, Chicago, IL 60616, USA |
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| Abstract: | This paper presents the results of an ongoing investigation into transient pressure pulses using Shannon entropy. Pressure fluctuations (produced by gas–solid two-phase flow during fluidized dense-phase conveying) are recorded by pressure transducers installed at strategic locations along a pipeline. This work validates previous work on identifying the flow mode from pressure signals (Mittal, Mallick, & Wypych, 2014). Two different powders, namely fly ash (median particle diameter 45 μm, particle density 1950 kg/m3, loosely poured bulk density 950 kg/m3) and cement (median particle diameter 15 μm, particle density 3060 kg/m3, loosely poured bulk density 1070 kg/m3), are conveyed through different pipelines (51 mm I.D. × 70 m length and 63 mm I.D. × 24 m length). The transient nature of pressure fluctuations (instead of steady-state behavior) is considered in investigating flow characteristics. Shannon entropy is found to increase along straight pipe sections for both solids and both pipelines. However, Shannon entropy decreases after a bend. A comparison of Shannon entropy among different ranges of superficial air velocity reveals that high Shannon entropy corresponds to very low velocities (i.e. 3–5 m/s) and very high velocities (i.e. 11–14 m/s) while low Shannon entropy corresponds to mid-range velocities (i.e. 6–8 m/s). |
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| Keywords: | Transient pressure fluctuations Fluidized dense phase Shannon entropy Flow pattern Solid loading ratio Superficial air velocity |
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