Abstract
A study has been conducted to determine the effects of operating conditions such as vibration frequency, vibration amplitude on the fractal structure of silica (SiO 2 ) nanoparticle agglomerate in a vibro-fluidized bed. An improved model was proposed by assimilation of fractal theory, Richardson-Zaki equation and mass balance. This model has been developed to predict the properties of nanoparticle agglomerate, such as fractal dimension and its size. It has been found out the vibration intensity increase leads to a slight reduction in fractal dimension of agglomerate. This Paper is also indicated that the size of agglomerate has the same behavior as fractal dimension with respect to vibration intensity changes. This study demonstrated that the fractal dimension of Silica nanoparticle agglomerate is in the range of 2.61 to 2.69 and the number of primary particles in the agglomerate is in the order of 10 10 . The vibration frequency is more impressive than its amplitude on agglomerate size reduction. Calculated Minimum fluidization velocity by applying predicted agglomerate sizes and experimental data are acceptable fitted.
Highlights
In recent years, there has been growing interest in nanoparticle fluidization
To investigate the precision of the model presented in this work, results of this model, in terms of agglomerate size and minimum fluidization velocity, were compared to the results of models suggested by Nam et al [13], Zhu et al [6] and Wang et al [33] based on the experimental values reported by Zhu et al [6]
An improved model is proposed to determine size and fractal characteristics of nanoparticle agglomerates in vibro-fluidized beds
Summary
There has been growing interest in nanoparticle fluidization. Agglomeration is a common phenomenon in nanoparticles fluidization as result of strong interparticle force [1,2,3,4]. Several attempts have been made to determine the aspects of nanoparticle fluidization [3, 5,6,7,8,9]. Previous studies have revealed that the fluidization of nanoparticles can be classified into two categories, including agglomerate particulate fluidization (APF) and agglomerate bubbling fluidization (ABF). The APF shows homogeneous (bubble-less) fluidization, high bed expansion ratio by increasing the gas velocity and behaves as fluid-like fluidization [10]. The ABF has large bubbles and low bed expansion ratio [10]
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