Experimental investigation into transient pressure pulses during pneumatic conveying of fine powders using Shannon entropy

作     者：Amit Goel Anu Mittal S.S. Mallick Atul Sharma 

作者机构：Department of Mechanical Engineering Thapar University Patiala Punjab 147004 India 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2016年第14卷第6期

页      面：143-153页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070104[理学-应用数学] 081701[工学-化学工程] 0701[理学-数学] 

基　　金：the Young Scientist Scheme 

主　　题：Transient pressure fluctuations Fluidized dense phase Shannon entropy Flow pattern Solid loading ratio Superficial air velocity 

摘      要：This paper presents the results of an ongoing investigation into transient pressure pulses using Shan- non 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 den- sity 1950 kg/m3. loosely poured bulk density 950 kg/m3） and cement （median particle diameter 15 p,m, 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 fluc- tuations （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）.