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1. Application of quadrature-based uncertainty quantification to the NETL small-scale challenge problem SSCP-I

Author:
Hu, X.; Passalacqua, A.; Fox, R.O.
Source:
Powder technology 2015 v.272 pp. 100-112
ISSN:
0032-5910
Subject:
fluidized beds; models; powders; probability distribution; uncertainty
Abstract:
... Non-intrusive quadrature-based uncertainty quantification with reconstruction of the distribution of the system response is introduced and applied to the simulation of dense fluidized beds. This approach relies on the conditional quadrature method of moments (CQMOM) to generate a set of samples of the distribution of multiple uncertain parameters of the model. The moments of the system response ar ...
DOI:
10.1016/j.powtec.2014.11.030

2. CFD-PBM modeling polydisperse polymerization FBRs with simultaneous particle growth and aggregation: The effect of the method of moments

Author:
Yao, Ya; Su, Jun-Wei; Luo, Zheng-Hong
Source:
Powder technology 2015 v.272 pp. 142-152
ISSN:
0032-5910
Subject:
equations; hydrodynamics; models; particle size distribution; polymerization; powders; prediction
Abstract:
... Real solid systems in polymerization fluidized bed reactors (FBRs) are characterized by wide particle size distributions that change continuously due to particle micro-behavior, growth and aggregation, etc. Simulations of such gas–solid flow hydrodynamics require the solution of a coupled computational fluid dynamics (CFD)-population balance equation (PBE) model, i.e. the CFD-PBM. Therefore, the a ...
DOI:
10.1016/j.powtec.2014.11.037

3. Coal fragment size model in cutting process

Author:
Liu, Xiaohui; Liu, Songyong; Tang, Ping
Source:
Powder technology 2015 v.272 pp. 282-289
ISSN:
0032-5910
Subject:
coal; cutting; dust; mining; models; powders; specific energy
Abstract:
... The size of coal fragment cutoffs by cutting mechanisms is an important index of coal mining. The larger the coal fragments, the less the dust, the lower the specific energy consumption and the higher the benefit. Therefore, a coal fragment size model was formulated in order to obtain large coal fragments in the cutting process, which considered the effect of pick arrangements (sequence and Punnet ...
DOI:
10.1016/j.powtec.2014.12.015

4. Combined small- and wide-angle X-ray scattering studies on oxide-supported Pt nanoparticles prepared by a CVS and CVD process

Author:
Guo, Xiaoai; Gao, Kun; Gutsche, Alexander; Seipenbusch, Martin; Nirschl, Hermann
Source:
Powder technology 2015 v.272 pp. 23-33
ISSN:
0032-5910
Subject:
X-ray diffraction; aluminum oxide; atmospheric pressure; catalysts; crystallites; databases; fractal dimensions; mixing; models; nanoparticles; powders; quantitative analysis; silica; surface roughness; titanium dioxide; transmission electron microscopy; wide-angle X-ray scattering
Abstract:
... Various model oxide-supported metal catalyst particles (Pt nanodots supported on silica, titania and alumina) prepared by a CVS/CVD process at atmospheric pressure have been studied by using a self-developed SAXS and WAXS laboratory system. It has been shown that simultaneous SAXS and WAXS analyses offer a structural insight into the complexity of the supported metal catalysts, allowing quantitati ...
DOI:
10.1016/j.powtec.2014.11.028

5. Cyclone optimization including particle clustering

Author:
Alves, André; Paiva, Julio; Salcedo, Romualdo
Source:
Powder technology 2015 v.272 pp. 14-22
ISSN:
0032-5910
Subject:
biomass; equipment; models; particle size distribution; powders; prediction
Abstract:
... In this work, a new family of geometries of reverse-flow cyclones was obtained through numerical optimization, using a stochastic random search global optimizer coupled with the PACyc model. The objective was to optimize the geometry of a reverse-flow cyclone taking into account inter-particle agglomeration (clustering), since this phenomenon usually occurs to some degree in industrial cyclone ope ...
DOI:
10.1016/j.powtec.2014.11.016

6. Effects of nanoparticle migration and asymmetric heating on mixed convection of TiO2–H2O nanofluid inside a vertical microchannel

Author:
Hedayati, F.; Domairry, G.
Source:
Powder technology 2015 v.272 pp. 250-259
ISSN:
0032-5910
Subject:
convection; models; nanofluids; nanoparticles; powders; temperature profiles; titanium dioxide; viscosity; water
Abstract:
... The effects of nanoparticle migration on mixed convection of titania/water nanofluid inside a vertical microchannel have been investigated numerically via Runge–Kutta–Fehlberg method. A modified two-component heterogeneous model is employed for the nanofluid in the hypothesis that the Brownian motion and the thermophoresis are the only responsible mechanisms for nanoparticle migration. Because of ...
DOI:
10.1016/j.powtec.2014.12.003

7. Ignition time of nanopowders during milling: A novel simulation

Author:
Ebrahimi-Kahrizsangi, Reza; Abdellahi, Majid; Bahmanpour, Maryam
Source:
Powder technology 2015 v.272 pp. 224-234
ISSN:
0032-5910
Subject:
X-ray diffraction; algorithms; arithmetics; energy; melting point; milling; models; powders; process control; spinning; temperature
Abstract:
... Detecting the sudden temperature increase of the milling vial, detecting the sudden total pressure increase inside the vial as well as XRD analysis from the synthesized phases are techniques that can be used to determine the ignition time in mechanically self-sustaining reactions (MSRs) induced by ball milling. In the present study a novel technique based on the Gene Expression Programming (GEP) a ...
DOI:
10.1016/j.powtec.2014.12.009

8. Influence of drying conditions on layer porosity in fluidized bed spray granulation

Author:
Rieck, C.; Hoffmann, T.; Bück, A.; Peglow, M.; Tsotsas, E.
Source:
Powder technology 2015 v.272 pp. 120-131
ISSN:
0032-5910
Subject:
air; aluminum oxide; coatings; drying; fluidized beds; glass; heat; models; particle size distribution; porosity; powders; sodium benzoate; spraying; temperature
Abstract:
... Particle coating experiments were performed in a lab-scale fluidized bed with varying process parameters, such as spraying rate and air inlet temperature, leading to different drying conditions. Porous (γ-Al2O3) and non-porous (glass) initial particles were sprayed with a sodium benzoate solution. For each experiment, the particle size distribution as well as the layer porosity was measured. The r ...
DOI:
10.1016/j.powtec.2014.11.019

9. Investigating the conveying mechanism of particulate plugs with stationary layers

Author:
Shaul, Semion; Kalman, Haim
Source:
Powder technology 2015 v.272 pp. 322-331
ISSN:
0032-5910
Subject:
bulk density; conveyors; energy; models; powders; prediction
Abstract:
... This paper presents an investigation into pneumatic conveying mechanism of particulate plugs with stationary layers. A plug flow regime may exist in pneumatic conveying systems operating with high-pressure gradients and low gas velocities. The most significant advantages of transporting particulate materials in a plug form is low energy consumption, low particle attrition and low pipe erosion. How ...
DOI:
10.1016/j.powtec.2014.12.004

10. Numerical study of a lab-scale double slot-rectangular spouted bed with the parallel CFD–DEM coupling approach

Author:
Yang, Shiliang; Luo, Kun; Zhang, Ke; Qiu, Kunzan; Fan, Jianren
Source:
Powder technology 2015 v.272 pp. 85-99
ISSN:
0032-5910
Subject:
equations; hydrodynamics; models; powders; turbulent flow
Abstract:
... The hydrodynamics of a three-dimensional double slot-rectangular spouted bed with two uniform chambers and two parallel slots are numerically studied by means of the parallel CFD–DEM coupling approach. In the coupling framework, the gas flow is described using the Navier–Stokes equations while the particles are tracked with the discrete element method. The start-up procedure and the typical flow s ...
DOI:
10.1016/j.powtec.2014.11.035

11. On the origin of non-linear breakage kinetics in dry milling

Author:
Capece, M.; Davé, R.N.; Bilgili, E.
Source:
Powder technology 2015 v.272 pp. 189-203
ISSN:
0032-5910
Subject:
dry milling; energy; grinding; models; powders
Abstract:
... While population balance models (PBMs) have described the impact of mechanical interparticle interactions on the specific breakage rate in dry milling processes through a phenomenological effectiveness factor, such models lack particle-scale information and thus a mechanistic basis. In this study, a mechanistic effectiveness factor of the non-linear PBM was derived and calculated by coupling a par ...
DOI:
10.1016/j.powtec.2014.11.040

12. Thermodynamic properties, kinetics and adsorption mechanisms of Swiss cheese bioaroma powder

Author:
Silva, Eric Keven; Borges, Soraia Vilela; da Costa, Joyce Maria Gomes; Queiroz, Fabiana
Source:
Powder technology 2015 v.272 pp. 181-188
ISSN:
0032-5910
Subject:
Swiss cheese; adsorption; corn starch; encapsulation; enthalpy; entropy; maltodextrins; microparticles; models; powders; spray drying; temperature; water; water activity; water vapor
Abstract:
... Water adsorption kinetics of Swiss cheese bioaroma microparticles were determined by a static method at 15°C, 25°C, 35°C and 45°C. This work used the Guggenheim–Anderson–de Boer (GAB) model to calculate thermodynamic properties of water adsorption. Additionally, this work predicted conditions for the stable storage of microparticles obtained through a spray drying encapsulation process with maltod ...
DOI:
10.1016/j.powtec.2014.12.002