Effect of Particle and Fluid Properties on the Pickup Velocity of Fine Particles

Abstract

Systems involving fluid-particle flows are a key component of many industrial processes, but they are not well-understood. One important parameter to consider when designing a conveying system is pickup velocity, the minimum fluid velocity required for particle entrainment. Many theoretical and experimental analyses have been performed to better understand pickup velocity, but there is little consistency with regard to system conditions, fluid properties, and particle characteristics, which makes comparisons between these studies very difficult. Although the proper design of many conveying systems requires the utilization of expressions that are applicable across a broad range of operating parameters, most expressions are system specific, which means that they are not extendable to other conditions. Also, there is currently an absence of a universal expression to predict particle entrainment in both gases and liquids. in this work, the pickup velocity of glass spheres, crushed glass, and stainless steel spheres in water has been measured for particles less than 450 μm. the effects of particle size, particle shape, and particle density are discussed and compared to the pickup velocity trends previously determined for similar gas-phase systems. in addition, the experimental data are used to assess an existing force balance model previously developed for gas-phase systems. © 2009 Elsevier B.V. All rights reserved.

Department(s)

Chemical and Biochemical Engineering

Comments

American Chemical Society Petroleum Research Fund, Grant 44508-G9

Keywords and Phrases

Electrostatic forces; Entrainment; Pickup velocity; Pneumatic conveying; Powder technology

International Standard Serial Number (ISSN)

0032-5910

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

10 Dec 2009

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