Experimental investigation into transient pressure pulses during pneumatic conveying of fine powders using Shannon entropy--颗粒学报PARTICUOLOGY

Goel, A., Mittal, A., Mallick, S. S., & Sharma, A. (2016). Experimental investigation into transient pressure pulses during pneumatic conveying of fine powders using Shannon entropy. Particuology, 29, 143-153. https://doi.org/10.1016/j.partic.2016.03.003

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

Amit Goel ^*, Anu Mittal, S.S. Mallick, Atul Sharma

Department of Mechanical Engineering, Thapar University, Patiala, Punjab 147004, India

10.1016/j.partic.2016.03.003

Volume 29, December 2016, Pages 143-153

Received 3 December 2015, Revised 4 March 2016, Accepted 22 March 2016, Available online 25 June 2016, Version of Record 18 November 2016.

E-mail: amitgoel3304@gmail.com

Highlights

• Transient pressure fluctuations for dense-phase conveying were investigated using Shannon entropy.

• Shannon entropy value was increased along the straight section of pipeline.

• At low superficial air velocity, Shannon entropy value was highest.

• At low solid loading ratio, addition of solids material increased pressure fluctuations.

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).

Graphical abstract

Keywords

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

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