Author
Andrew Sowinski
Bio: Andrew Sowinski is an academic researcher from University of Ottawa. The author has contributed to research in topics: Fluidized bed & Fluidization. The author has an hindex of 9, co-authored 24 publications receiving 390 citations.
Topics: Fluidized bed, Fluidization, Particle, Fouling, Particle size
Papers
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TL;DR: In this paper, a new system was developed that aimed to quantifying the electrostatic charge generation in three key areas within a gas-solid fluidized bed simultaneously: the bed particles, the particles that adhered to the column wall, and those that were entrained from the column.
107 citations
TL;DR: In this paper, the effect of particle size of polyethylene resin received directly from industrial reactors on electrostatic charge generation and reactor wall fouling was studied, and it was found that the smaller particles had a higher charge and resulted in more particle-reactor wall adhesion.
60 citations
TL;DR: In this article, a Faraday cup placed within the windbox of a fluidization column was used to measure the total net electrostatic charges in gas-solid fluidized beds. But the Faraday Cup was not suitable for measuring the total charge of the bed particles rather than a local measurement.
51 citations
TL;DR: In this paper, the authors investigated the charge distribution within the wall fouling region and bulk of a fluidized bed reactor and found that wall particles were predominantly negatively charged while those which did not adhere to the wall were predominantly positively charged.
46 citations
TL;DR: In this paper, a combined multi-fluid and electrostatic model was used to simulate laboratory-scale experiments on electrostatics in gas-solid fluidized beds conducted by Sowinski et al.
43 citations
Cited by
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TL;DR: In this paper, it was shown that the role played by contact/friction force is to induce strong overlap between the electron clouds (or wave function in physics, bonding in chemistry), which leads to electron transition between the atoms/molecules owing to the reduced interatomic potential barrier.
774 citations
Journal Article•
TL;DR: This book presents the separation-of-variables and T-matrix methods of calculating the scattering of electromagnetic waves by particles, and the connection between the theory and the computer programs is reinforced by references in thecomputer programs to equations in the text.
Abstract: This book presents the separation-of-variables and T-matrix methods of calculating the scattering of electromagnetic waves by particles. Analytical details and computer programs are provided for determining the scattering and absorption characteristics of the finite-thickness slab, infinite circular cylinder (normal incidence), general axisymmetric particle, and sphere.The computer programs are designed to generate data that is easy to graph and visualize, and test cases in the book illustrate the capabilities of the programs. The connection between the theory and the computer programs is reinforced by references in the computer programs to equations in the text. This cross-referencing will help the reader understand the computer programs, and, if necessary, modify them for other purposes.
487 citations
TL;DR: The electrostatic charge that is generated when two materials are contacted or rubbed and then separated is a well-known physical process that has been studied for more than 2500 years as discussed by the authors.
Abstract: The electrostatic charge that is generated when two materials are contacted or rubbed and then separated is a well-known physical process that has been studied for more than 2500 years Contact electrification occurs in many contexts, both natural and technological For example, in dust storms the collisions between particles lead to electrostatic charging and in extreme cases, extraordinary lightning displays In electrophotography, toner particles are intentionally charged to guide their deposition in well-defined patterns Despite such a long history and so many important consequences, a fundamental understanding of the mechanism behind contact electrification remains elusive An open question is what type of species are transferred between the surfaces to generate charge—experiments suggest various species ranging from electrons to ions to nanoscopic bits of material, and theoretical work suggests that non-equilibrium states may play an important role Another open question is the contact electrification that occurs when two insulating materials with identical physical properties touch—since there is no apparent driving force, it is not clear why charge transfer occurs A third open question involves granular systems—models and experiments have shown that a particle-size dependence for the charging often exists In this review, we discuss the fundamental aspects of contact electrification and highlight recent research efforts aimed at understanding these open questions
456 citations
15 Jul 2019
TL;DR: A review of recent advances and their accompanying surprises can be found in this paper. Yet, its most basic foundations remain poorly understood, and progress is often countered by the emergence of baffling new observations.
Abstract: Static electrification is among the earliest of the sciences, well known to us all and with widespread and important consequences. Yet, its most basic foundations remain poorly understood. For example, after centuries of research, it is still not clear whether electrons, ions or even bulk material transfer is responsible for the observed charging. Recent work has leveraged the most advanced experimental and theoretical approaches, and has addressed the phenomenon from perspectives of quantum mechanics, surface chemistry, mechanochemistry and statistical physics. While the resulting findings have advanced many aspects of our understanding, they have also led to the discovery of new surprises that we are only beginning to appreciate. This Review addresses both recent advances and their accompanying surprises. Triboelectric charging is well known to us all and has widespread and important consequences. Nonetheless, its most basic foundations remain poorly understood, and progress is often countered by the emergence of baffling new observations. Recent work shows the difficulty may arise because charging is governed by competing and unstable dynamical processes.
197 citations
TL;DR: In this paper, the Navier-Stokes order continuum theory is used for CFD simulation of the hydrodynamics of gas-solid fluidization, without taking the effects of heat and mass transfer as well as chemical reactions into consideration.
179 citations