Enhanced fluidization of nanoparticles in an oscillating magnetic field

Fluidization Characteristics of SiO2 Nanoparticles in an Acoustic Fluidized

“…With respect to an oscillating magnetic field, Yu et al [8] found that the beds nanoparticle agglomerates can be smoothly fluidized, and the minimum fluidization velocity is significantly reduced. Moreover, channelling and plugging of the bed disappears and the bed expands uniformly without bubbles, together with negligible elutriation.…”

Role of Acoustic Fields in Promoting the Gas-Solid Contact in a Fluidized Bed of Fine Particles

“…In other words, the achievement of a smooth fluidization regime is closely related to an efficient break-up of the large aggregates yielded by cohesive forces. To this aim and to overcome these inter-particle forces and achieve a smooth fluidization regime, externally assisted fluidization can be used, thus involving the application of additional forces generated, for instance, by acoustic (Ammendola and Chirone, 2010;Raganati et al, 2011a;Raganati et al, 2011b), electric (Lepek et al, 2010b;Valverde et al, 2009) and magnetic (Zeng et al, 2008;Yu et al, 2005) fields or mechanical vibrations (Nam et al, 2004;Yang et al, 2009a) to excite the fluidized bed, thus avoiding channelling and enhancing the dynamics of the powder. Among all these available techniques, sound-assisted fluidization has been indicated as one of the best technological options to smoothly fluidize fine and ultra-fine powders: under the influence of appropriate acoustic fields, channelling and/ or slugging tends to disappear, the bed expands uniformly and the minimum fluidization velocity is distinctly reduced (Ammendola and Chirone, 2010;Raganati et al, 2011a;Raganati et al, 2011b).…”

An evaluation of the solid hold‐up distribution in a fluidized bed of nanoparticles using radioactive densitometry and fibre optics

“…Consequently, the objective of the current paper is to focus on the fluidization of zirconia and aluminum nanoparticles to investigate their performance in a fluidized bed. Although the fluidization of nanoparticles happens in an agglomerate state (Chaouki et al, 1985;Morooka et al, 1988;Iwadate and Horio, 1998;Wang et al, 1998Wang et al, , 2006Li et al, 1999;Li, 1999, 2000;Lu and Li, 2000;Matsuda et al, 2001Matsuda et al, , 2004Jung and Gidaspow, 2002;Yao et al, 2002;Watano et al, 2003;Mawatari et al, 2003a,b;Li and Tong, 2004;Nam et al, 2004;Zhu et al, 2004Zhu et al, , 2005Hakim et al, 2005;Yu et al, 2005;Jiradilok et al, 2006;Guo et al, 2006aGuo et al, ,b, 2007Gundogdu et al, 2007;Liu et al, 2007;Quevedo et al, 2007), it is very important to understand if the fluidization of these particles would be carried out homogeneously in terms of solid and gas phase concentrations within the bed. Otherwise, the polymer encapsulation will not be uniformly applied on the surface of ultrafine particles.…”

“…n the last two decades, the fluidization of nanoparticles has been one of the most important research interests in the area of nanoparticle handling and processing (Chaouki et al, 1985;Morooka et al, 1988;Iwadate and Horio, 1998;Wang et al, 1998Wang et al, , 2006Li et al, 1999;Li, 1999, 2000;Lu and Li, 2000;Matsuda et al, 2001Matsuda et al, , 2004Jung and Gidaspow, 2002;Yao et al, 2002;Watano et al, 2003;Mawatari et al, 2003a,b;Li and Tong, 2004;Nam et al, 2004;Zhu et al, 2004Zhu et al, , 2005Hakim et al, 2005;Yu et al, 2005;Jiradilok et al, 2006;Guo et al, 2006aGuo et al, ,b, 2007Gundogdu et al, 2007;Liu et al, 2007;Quevedo et al, 2007). Researchers have dealt with different aspects of nanoparticle fluidization, for example, the evaluation of agglomerate size via force and energy balance (Chaouki et al, 1985;Morooka et al, 1988;Iwadate and Horio, 1998;Li, 1999, 2000;Lu and Li, 2000;Mawatari et al, 2003a;Matsuda et al, 2004;Guo et al, 2007), hydrodynamic modelling of the phenomenon (Chaouki et al, 1985;Iwadate and Horio, 1998;Wang et al, 1998;Li et al, 1999;Jung and Gidaspow, 2002;…”

“…Researchers have dealt with different aspects of nanoparticle fluidization, for example, the evaluation of agglomerate size via force and energy balance (Chaouki et al, 1985;Morooka et al, 1988;Iwadate and Horio, 1998;Li, 1999, 2000;Lu and Li, 2000;Mawatari et al, 2003a;Matsuda et al, 2004;Guo et al, 2007), hydrodynamic modelling of the phenomenon (Chaouki et al, 1985;Iwadate and Horio, 1998;Wang et al, 1998;Li et al, 1999;Jung and Gidaspow, 2002;Yao et al, 2002;Nam et al, 2004;Zhu et al, 2004;Jiradilok et al, 2006;Quevedo et al, 2007), and improving fluidization using external forces, such as a magnetic field (Lu and Li, 2000;Yu et al, 2005;Quevedo et al, 2007), centrifuge and rotation (Matsuda et al, 2001(Matsuda et al, , 2004Watano et al, 2003), vibration (Mawatari et al, 2003a,b;Nam et al, 2004;Quevedo et al, 2007) and ultrasound (Zhu et al, 2004;Guo et al, 2006aGuo et al, ,b, 2007Liu et al, 2007). However, aside from a small number of studies, no clear objective or application has been presented as a motivation for nanoparticle fluidization.…”