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Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization

Low-frequency flow pulsations were utilized to improve the hydrodynamics of the fluidized bed of hydrophilic ultrafine nanosilica powder with strong agglomeration behavior. A gradual fluidization of unassisted fluidized bed through stepwise velocity change was carried out over a wide range of veloci...

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Autores principales: Al-Ghurabi, Ebrahim H., Shahabuddin, Mohammed, Kumar, Nadavala Siva, Asif, Mohammad
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7075313/
https://www.ncbi.nlm.nih.gov/pubmed/32102201
http://dx.doi.org/10.3390/nano10020388
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author Al-Ghurabi, Ebrahim H.
Shahabuddin, Mohammed
Kumar, Nadavala Siva
Asif, Mohammad
author_facet Al-Ghurabi, Ebrahim H.
Shahabuddin, Mohammed
Kumar, Nadavala Siva
Asif, Mohammad
author_sort Al-Ghurabi, Ebrahim H.
collection PubMed
description Low-frequency flow pulsations were utilized to improve the hydrodynamics of the fluidized bed of hydrophilic ultrafine nanosilica powder with strong agglomeration behavior. A gradual fluidization of unassisted fluidized bed through stepwise velocity change was carried out over a wide range of velocities followed by a gradual defluidization process. Bed dynamics in different regions of the fluidized bed were carefully monitored using fast and sensitive pressure transducers. Next, 0.05-Hz square-wave flow pulsation was introduced, and the fluidization behavior of the pulsed fluidized bed was rigorously characterized to delineate its effect on the bed hydrodynamics by comparing it with one of the unassisted fluidized bed. Flow pulsations caused a substantial decrease in minimum fluidization velocity and effective agglomerate diameter. The frequencies and amplitudes of various events in different fluidized bed regions were determined by performing frequency domain analysis on real-time bed transient data. The pulsations and their effects promoted deagglomeration and improved homogeneity of the pulsed fluidized bed.
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spelling pubmed-70753132020-03-20 Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization Al-Ghurabi, Ebrahim H. Shahabuddin, Mohammed Kumar, Nadavala Siva Asif, Mohammad Nanomaterials (Basel) Article Low-frequency flow pulsations were utilized to improve the hydrodynamics of the fluidized bed of hydrophilic ultrafine nanosilica powder with strong agglomeration behavior. A gradual fluidization of unassisted fluidized bed through stepwise velocity change was carried out over a wide range of velocities followed by a gradual defluidization process. Bed dynamics in different regions of the fluidized bed were carefully monitored using fast and sensitive pressure transducers. Next, 0.05-Hz square-wave flow pulsation was introduced, and the fluidization behavior of the pulsed fluidized bed was rigorously characterized to delineate its effect on the bed hydrodynamics by comparing it with one of the unassisted fluidized bed. Flow pulsations caused a substantial decrease in minimum fluidization velocity and effective agglomerate diameter. The frequencies and amplitudes of various events in different fluidized bed regions were determined by performing frequency domain analysis on real-time bed transient data. The pulsations and their effects promoted deagglomeration and improved homogeneity of the pulsed fluidized bed. MDPI 2020-02-23 /pmc/articles/PMC7075313/ /pubmed/32102201 http://dx.doi.org/10.3390/nano10020388 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Al-Ghurabi, Ebrahim H.
Shahabuddin, Mohammed
Kumar, Nadavala Siva
Asif, Mohammad
Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization
title Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization
title_full Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization
title_fullStr Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization
title_full_unstemmed Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization
title_short Deagglomeration of Ultrafine Hydrophilic Nanopowder Using Low-Frequency Pulsed Fluidization
title_sort deagglomeration of ultrafine hydrophilic nanopowder using low-frequency pulsed fluidization
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7075313/
https://www.ncbi.nlm.nih.gov/pubmed/32102201
http://dx.doi.org/10.3390/nano10020388
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