Liquid-particle surface properties on spouted bed coating and drying performance

2009 ◽  
Vol 87 (5) ◽  
pp. 695-703 ◽  
Author(s):  
S. C. S. Rocha ◽  
M. W. Donida ◽  
A. M. M. Marques
Keyword(s):  
Surface Properties ◽  
Particle Surface ◽  
Liquid Particle ◽  
Spouted Bed

scholarly journals CFD-DEM Simulation of Spouted Bed Dynamics under High Temperature with an Adhesive Model

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2276
Author(s):  
Zhao Chen ◽  
Lin Jiang ◽  
Mofan Qiu ◽  
Meng Chen ◽  
Rongzheng Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Particle Surface ◽  
Particle Collision ◽  
Gas Velocity ◽  
Spouted Bed ◽  
Dem Simulation ◽  
Linear Spring ◽  
Adhesion Model ◽  
Adhesive Model ◽  
Damping Model

Particle adhesion is of great importance to coating processes due to its effect on fluidization. Currently, Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) has become a powerful tool for the study of multiphase flows. Various contact force models have also been proposed. However, particle dynamics in high temperature will be changed with particle surface properties changing. In view of this, an adhesion model is developed based on approaching-loading-unloading-detaching idea and particle surface change under high temperature in this paper. Analyses of the adhesion model are given through two particle collision process and validated by experiment. Effects of inlet gas velocity and adhesion intensity on spouted bed dynamics are investigated. It is concluded that fluidization cycle will be accelerated by adhesion, and intensity of fluidization will be marginally enhanced by slight adhesion. Within a certain range, increasing inlet gas velocity will lead to strong intensity of particle motion. A parameter sensitivity comparison of linear spring-damping model and Hertz-Mindlin Model is given, which shows in case of small overlaps, forces calculated by both models have little distinction, diametrically opposed to that of large overlaps.

scholarly journals Effective Modification of Particle Surface Properties Using Ultrasonic Water Mist

2009 ◽  
Vol 10 (1) ◽  
pp. 282-288 ◽  
Author(s):  
Natalja Genina ◽  
Heikki Räikkönen ◽  
Jyrki Heinämäki ◽  
Osmo Antikainen ◽  
Simo Siiriä ◽  
...  
Keyword(s):  
Surface Properties ◽  
Particle Surface ◽  
Water Mist

Study on Particle Surface Modification Using a Spouted Bed Plasma Reactor

2018 ◽  
Vol 44 (4) ◽  
pp. 236-241
Author(s):  
Nobusuke Kobayashi ◽  
Baiqiang Zhang ◽  
Kengo Hanai ◽  
Yoshinori Itaya
Keyword(s):  
Surface Modification ◽  
Plasma Reactor ◽  
Particle Surface ◽  
Spouted Bed

Effect of Surface Properties on Particle Growth Kinetics for Polymer Coating in Spouted Bed

2012 ◽  
Vol 727-728 ◽  
pp. 1616-1621 ◽  
Author(s):  
Boeira Braga Matheus ◽  
Cristina dos Santos Rocha Sandra
Keyword(s):  
Surface Energy ◽  
Surface Properties ◽  
Growth Kinetics ◽  
Particle Growth ◽  
Operating Conditions ◽  
Polymeric Film ◽  
Spouted Bed ◽  
Particle Coating ◽  
Solids Concentration ◽  
Before And After

In this research, glass beads with size range between 1.68 and 2mm were coated with 5 polymeric suspensions. The suspensions formulations differ in relation to their employment and physical properties (solids concentration, surface tension and rheology), generating different characteristics of wettability and adhesion with the nucleus. The aim of this study was to evaluate particle coating in a spouted bed through analysis of particle growth in terms of solid surface energy, wettability, and adhesion before and after the formation of the first layer of polymeric film on the particle. The solid-suspension and film-suspension systems were characterized by contact angle and surface energy. The operating conditions were fixed for all suspensions: 1.5 kg of beads, air velocity of 0.369 m/s, air temperature of 60 °C, suspension flow rate of 4 ml and atomizing pressure of 10 psig. Analyzing particle growth kinetics, different behaviors were observed and related not only to glass-suspension wettability, but also to polymeric film-suspension surface properties.

scholarly journals The zeta potential measurements in sandpacks saturated with monovalent electrolytes

2018 ◽  
Vol 34 (2) ◽  
Author(s):  
Luong Duy Thanh
Keyword(s):  
Zeta Potential ◽  
Surface Properties ◽  
Electrolyte Concentration ◽  
Particle Surface ◽  
Binding Constants ◽  
Sand Particles ◽  
The Difference ◽  
Group 2 ◽  
Good Agreement ◽  
Group 1

Measurements of the zeta potential in sandpacks saturated with monovalent electrolytes at six different electrolyte concentrations have been reported. The values we record are classified into two groups based on the magnitude of the zeta potential: group 1 (samples S1 and S2) and group 2 (samples S3 and S4). The measured zeta potential in magnitude in group 1 is much smaller than that in group 2 and in literature at the same electrolyte concentration. The reason for a big variation of the zeta potential between group 1 and group 2 may be due to the difference in technique of making sand particles of different size leading to change of particle surface properties. Consequently, the zeta potential that depends on the surface properties would vary. The results show that there is a gradual decrease in the zeta potential with increase in monovalent electrolyte concentration (from 10−4 M to 10−2 M). Additionally, the empirical expressions between the zeta potential and electrolyte concentration are obtained in this work for both group 1 and group 2. The obtained expression for group 2 is in good agreement with those available in literature. From the experimental data in combination with a theoretical model, the binding constants for Na+ and K+ cations are obtained for the samples of group 2 and they are in the same range reported in literature for silica-based samples. 

Coating and Drying in Spouted Bed: Influence of the Liquid-Particle Work of Adhesion

2007 ◽  
Vol 25 (2) ◽  
pp. 319-326 ◽  
Author(s):  
M. W. Donida ◽  
S. C. S. Rocha ◽  
B. D. Castro ◽  
A. M. M. Marques
Keyword(s):  
Work Of Adhesion ◽  
Liquid Particle ◽  
Spouted Bed

Particle surface properties of stainless steel-coated tungsten carbide powders

2006 ◽  
Vol 164 (3) ◽  
pp. 124-129 ◽  
Author(s):  
C.M. Fernandes ◽  
A.M.R. Senos ◽  
M.T. Vieira
Keyword(s):  
Stainless Steel ◽  
Tungsten Carbide ◽  
Surface Properties ◽  
Particle Surface
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