Characterization of TiO2 nanoparticles fluidization using X-ray imaging and pressure signals

Gómez Hernández, Jesús; Sánchez Delgado, Sergio; Wagner, Evert; Mudde, Robert F.; Van Ommen, J Ruud

Publication:
Characterization of TiO2 nanoparticles fluidization using X-ray imaging and pressure signals

dc.affiliation.dpto	UC3M. Departamento de Ingeniería Térmica y de Fluidos	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Tecnologías Apropiadas para el Desarrollo Sostenible	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Ingeniería de Sistemas Energéticos	es
dc.contributor.author	Gómez Hernández, Jesús
dc.contributor.author	Sánchez Delgado, Sergio
dc.contributor.author	Wagner, Evert
dc.contributor.author	Mudde, Robert F.
dc.contributor.author	Van Ommen, J Ruud
dc.date.accessioned	2021-04-08T10:43:53Z
dc.date.available	2021-04-08T10:43:53Z
dc.date.issued	2017-07-01
dc.description.abstract	The fluidization of TiO2-P25 nanoparticles is characterized by studying the X-ray attenuation through the bed and the dynamic response of pressure fluctuations to the influence of the gas velocity. The X-ray results are based on a flat detector capable of measuring a 2D projection of the column from a height of 3 cm above the distributor to the freeboard. Pressure fluctuation signals are analyzed in the time and frequency domain. The strong influence of hysteresis when increasing or decreasing the gas flow is used in the experiments to compare a well fluidized state to channels formation. Thus, two experimental procedures were carried out changing the gas velocity. First, the gas flow is decreased changing from fully fluidized to packed bed. In the second type of tests, the gas velocity is increased from packed bed to well fluidized. The use of Digital Image Analysis (DIA) techniques to study the Xray images show the homogeneous distribution of solids within the bed when the gas velocity is decreased. In these tests, a smooth fluidization is found up to a gas velocity of 3 cm/s, while higher gas flows change the bed state to vigorous fluidization. Pressure signals revealed that Baskakov's frequency can be used to determine the regime of the bed, smooth or vigorous bubbling. Tests with poor fluidization show that the formation of channels modifies the bed structure, hindering to reach the fluidization quality of well fluidized tests for the same experimental conditions.	en
dc.format.extent	9
dc.identifier.bibliographicCitation	Gómez-Hernández, J., Sánchez-Delgado, S., Wagner, E., Mudde, R. F. & van Ommen, J. R. (2017). Characterization of TiO2 nanoparticles fluidization using X-ray imaging and pressure signals. Powder Technology, 316, pp. 446–454.	en
dc.identifier.doi	https://doi.org/10.1016/j.powtec.2016.11.068
dc.identifier.issn	0032-5910
dc.identifier.publicationfirstpage	446
dc.identifier.publicationlastpage	454
dc.identifier.publicationtitle	Powder Technology	en
dc.identifier.publicationvolume	316
dc.identifier.uri	https://hdl.handle.net/10016/32313
dc.identifier.uxxi	AR/0000020167
dc.language.iso	eng	en
dc.publisher	Elsevier	en
dc.rights	© 2016 Elsevier B.V.	en
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 España	*
dc.rights.accessRights	open access	en
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/es/	*
dc.subject.eciencia	Materiales	en
dc.subject.other	Fluidized bed	en
dc.subject.other	Nanoparticles	en
dc.subject.other	X-ray imaging	en
dc.subject.other	Pressure fluctuations	en
dc.subject.other	Hysteresis	en
dc.subject.other	Channels	en
dc.title	Characterization of TiO2 nanoparticles fluidization using X-ray imaging and pressure signals	en
dc.type	research article	*
dc.type.hasVersion	AM	*
dspace.entity.type	Publication