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You searched for: Journal name Powder technology Remove constraint Journal name: Powder technology Publication year rev 7978-2022 Remove constraint Publication year rev: 7978-2022 Source 2022 v.397 Remove constraint Source: 2022 v.397
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1. A microscopic study on the mixing process of binary solids in bubbling fluidized bed

Author:
Jikai Huang; Huanan Li; Chongliang Huang; Yake Jiang; Zhigang Liu
Source:
Powder technology 2022 v.397 pp. 117089
ISSN:
0032-5910
Subject:
convection; dispersibility; fluidized beds; technology
Abstract:
... A novel method for measuring the micro mixing ratio of binary solids in dense fluidizations is developed. The mixing process within a bubbling fluidized bed that can be assumed as one mixing cell is resolved. Dispersion coefficient and mixing index methods are applied to characterize the mixing process. Results show that diffusion has an important effect on mixing at the bottom and top of the flui ...
DOI:
10.1016/j.powtec.2021.117089

2. An improved multi-phase weakly-compressible SPH model for modeling various landslides

Author:
Youting Qi; Jianyun Chen; Guibin Zhang; Qiang Xu; Jing Li
Source:
Powder technology 2022 v.397 pp. 117120
ISSN:
0032-5910
Subject:
evolution; friction; landslides; mathematical models; mechanical properties; momentum; technology
Abstract:
... A novel weakly compressible multi-phase SPH method is developed for modeling various landslides. In this model, the multi-phase system of fluid and granular materials is regarded as a continuum with multi-viscosity and multi-density. The mechanical behavior of the granular materials is described by the μ(I) rheological model and the dynamic effective pressure. An incremental diffusive term is deve ...
DOI:
10.1016/j.powtec.2022.117120

3. Bulk densities and flowability of mono-sized, binary mixtures and particle size distributions of glass spheres

Author:
Haim Kalman
Source:
Powder technology 2022 v.397 pp. 117086
ISSN:
0032-5910
Subject:
angle of repose; equations; glass; particle size; particle size distribution; technology
Abstract:
... The angle of repose, angle of tilting, and Hausner ratio are frequently used to estimate the flowability of a particulate material. Also, the free and tapped densities are commonly used for design and operating of particulate solids handling systems. In this study, these properties were determined for mono-sized, binary mixtures and particle size distributions of spherical glass. It was found, as ...
DOI:
10.1016/j.powtec.2021.117086

4. CFD study of binary mixture mixing/segregation of supercritical carbon dioxide fluidized bed

Author:
Wenjian Cai; Shuyan Wang; Xiaoxue Jiang; Hassan Muhammad; Huilin Lu
Source:
Powder technology 2022 v.397 pp. 117029
ISSN:
0032-5910
Subject:
carbon dioxide; fluidized beds; technology; temperature
Abstract:
... Mixing of binary mixture with small-sized particles component (SC) and large-sized particles component (LC) is simulated using unequal granular temperature-based kinetic theory (UGT-KT) in supercritical carbon dioxide fluid (S-CO₂) fluidized bed. Synergy angle is applied to identify the tendency of mixing/segregation of SC and LC binary mixture according to the axial distribution of component volu ...
DOI:
10.1016/j.powtec.2021.117029

5. Calibration of wet sand and gravel particles based on JKR contact model

Author:
Jiacheng Zhou; Libin Zhang; Chao Hu; Zhihang Li; Junjie Tang; Kuanmin Mao; Xiaoyu Wang
Source:
Powder technology 2022 v.397 pp. 117005
ISSN:
0032-5910
Subject:
calibration; energy; friction; gravel; models; sand; technology; vibration
Abstract:
... The parameters of wet sand and gravel particles with different shapes are calibrated based on JKR contact model. The results reveal that surface energy and rolling friction coefficient are the significant factors affecting the tangent of repose angle, indicating the great influence on the simulation accuracy of wet sand and gravel particles during vibration screening. In addition, the tangent of r ...
DOI:
10.1016/j.powtec.2021.11.049

6. Characterization of electrohydrodynamic flow in a plate-plate electrostatic precipitator with a wire-cylinder pre-charger by data-driven vortex and residence time analysis

Author:
Shuran Li; Mengze Li; Jiahe Ma; Yihan Fu; Yu Tian; Xing Shen; Jiafeng Li; Weidong Zhu; Yinglin Ke; Herek L. Clack; Keping Yan
Source:
Powder technology 2022 v.397 pp. 117015
ISSN:
0032-5910
Subject:
air; electric potential difference; particle image velocimetry; quantitative analysis; technology
Abstract:
... The two-stage electrostatic precipitator (ESP) is widely used for indoor air cleaning field, while both the Particle Image Velocimetry (PIV) observations and well-characterized quantitative descriptions are probably scarce. In this work, we propose to use vortex analysis, which is the main quantitative method for flow field, and the relative residence time method (RRT) to evaluate the electrohydro ...
DOI:
10.1016/j.powtec.2021.11.059

7. Comparisons of particle clustering phenomenon between gas-solids high-density and low-density circulating fluidized bed risers via numerical study

Author:
Zeneng Sun; Chao Zhang; Jesse Zhu
Source:
Powder technology 2022 v.397 pp. 117009
ISSN:
0032-5910
Subject:
fluidized beds; models; probability distribution; technology
Abstract:
... The clustering phenomenon in gas-solids high-density (Gs ≥ 300 kg/m²s) and low-density circulating fluidized bed (CFB) risers for FCC particles are compared through CFD studies using a cluster-based drag model. Large clouds of clusters can be clearly identified from the contours of local solids holdup distribution from CFD results, which correspond well to experimental observations. The size, shap ...
DOI:
10.1016/j.powtec.2021.11.053

8. Effect of nozzle pressure ratios on the flow and distribution of abrasive particles in abrasive air jet machining

Author:
Changjiang Chen; Yong Liu; Jiren Tang; Huidong Zhang
Source:
Powder technology 2022 v.397 pp. 117114
ISSN:
0032-5910
Subject:
air; kinetic energy; technology
Abstract:
... Effect of nozzle pressure ratio (NPR) on the flow and distribution of abrasive particles was investigated to improve supersonic abrasive air jet machining (AAJM) effect. The supersonic air-particle flow was simulated via CFD-DEM modeling, which was verified by AAJM experiments. It was concluded that NPR determined the acceleration and distribution of particle flow by controlling the structure and ...
DOI:
10.1016/j.powtec.2022.117114

9. Enhancement of solid-liquid mixing state quality in a stirred tank by cascade chaotic rotating speed of main shaft

Author:
Lian Zhang; Kai Yang; Meng Li; Qingtai Xiao; Hua Wang
Source:
Powder technology 2022 v.397 pp. 117020
ISSN:
0032-5910
Subject:
algorithms; decision support systems; energy transfer; energy use and consumption; technology; time series analysis
Abstract:
... In this work, a novel stirring strategy that chaotic-speed with Logistic-Logistic cascade sequence (CS-LLCS) is proposed to enhance the solid-liquid mixing state quality. Specially, the effects of stirring strategy, peak level (nₚᵥcₛ) and speed changing time (tₛcₜ) of CS-LLCS stirring on the mixing state quality of the fluids in a stirred tank are focused on to illustrate it. Moreover, a modern ti ...
DOI:
10.1016/j.powtec.2021.11.064

10. Improving the properties of botanical concrete based on waste concrete, wood, and kraft lignin powder

Author:
Ren Wei; Yuya Sakai
Source:
Powder technology 2022 v.397 pp. 117024
ISSN:
0032-5910
Subject:
cement; concrete; hydrophilicity; hydrophobicity; lignin; lignin content; renewable resources; waste wood; water uptake; wood
Abstract:
... Botanical concrete (BC) is a novel sustainable material that can simultaneously recycle concrete and wood waste without using cement. It has potential for use provided its high water absorption and low stability, caused by the inclusion of hydrophilic wood particles, are mitigated. This study aims to improve the water resistance of BC by experimenting with forming conditions and varying the amount ...
DOI:
10.1016/j.powtec.2021.11.068

11. Magnetic segregation behaviors of a binary mixture in fluidized beds

Author:
Biao Wang; Tianqi Tang; Shengnan Yan; Yurong He
Source:
Powder technology 2022 v.397 pp. 117031
ISSN:
0032-5910
Subject:
energy; magnetic fields; models; technology
Abstract:
... In industrial processes, external energy fields are used to efficiently regulate the segregation behaviors of fluidized beds containing binary mixtures. We added a magnetic field force model to the discrete element method used to numerically investigate the segregation behaviors of binary component particles in magnetic field-fluidized beds. We explored the effects of magnetic field intensity, gra ...
DOI:
10.1016/j.powtec.2021.117031

12. Measurement of particle adhesion force and effective contact radius via centrifuge equipped with horizontal and vertical substrates

Author:
Yasuhiro Shimada; Motohiro Tsubota; Shuji Matsusaka
Source:
Powder technology 2022 v.397 pp. 117103
ISSN:
0032-5910
Subject:
adhesion; centrifugation; models; particle size; relative humidity; surface roughness
Abstract:
... A centrifugal method was used to analyze and evaluate particle–surface interactions. Particles with count median diameters of 9.7, 14.5, and 32.8 μm were removed from horizontally and vertically mounted metal substrates. A point-mass model is conventionally used to analyze the forces exerted on particles during centrifugation. Conversely, in this study, a rigid-body model was employed considering ...
DOI:
10.1016/j.powtec.2021.117103

13. Microwave-assisted calcination of spodumene for efficient, low-cost and environmentally friendly extraction of lithium

Author:
Mohammad Rezaee; Shihua Han; Daulet Sagzhanov; Behzad Vaziri Hassas; Tania M. Slawecki; Dinesh Agrawal; Hamid Akbari; Robert Mensah-Biney
Source:
Powder technology 2022 v.397 pp. 116992
ISSN:
0032-5910
Subject:
X-ray diffraction; heat; lithium; microwave treatment; phase transition
Abstract:
... To utilize the advantages of microwave-assisted calcination over conventional heating, this work studied the effect of microwave power on phase transformation and leachability of spodumene. X-ray diffraction (XRD) and scanning electron microscope (SEM) were utilized to characterize the phase transformation and structural changes of spodumene calcined by both microwave and conventional heating meth ...
DOI:
10.1016/j.powtec.2021.11.036

14. Modeling and experimental verification of a novel vacuum dust collector for cleaning photovoltaic panels

Author:
Xiaoqiang Du; Yuechan Li; Ziyu Tang; Zenghong Ma; Feng Jiang; Haili Zhou; Chuanyu Wu; Fathi H. Ghorbel
Source:
Powder technology 2022 v.397 pp. 117014
ISSN:
0032-5910
Subject:
dust; fluid mechanics; photography; simulation models; solar collectors
Abstract:
... The multi-stage expansion chamber (MEC) nozzle can remove the dust particles from photovoltaic (PV) panels, but the nozzle shows a lack of dust collection. To address this issue, a novel vacuum dust collector is proposed in this study. The coupled computational fluid dynamics and discrete element method simulation model simulates the dust particle-airflow motions to optimize the structure of the c ...
DOI:
10.1016/j.powtec.2021.11.058

15. Modelling vertical water distribution and separation in the unsaturated coal and iron ores during oscillation

Author:
Jian Chen; Zhenjiang You; Ognjen Orozovic; Geoff Wang
Source:
Powder technology 2022 v.397 pp. 116996
ISSN:
0032-5910
Subject:
coal; equations; hydraulic conductivity; models; technology; water content; water distribution
Abstract:
... The effect of oscillation on the water distribution in unsaturated coal and iron ores plays a significant role in the material processing but has not been analysed quantitatively. This paper developed a model based on the Richards equation to describe the transient residual water distribution in the unsaturated coal and iron ores, and predicted the separated water with time. In this model, the eff ...
DOI:
10.1016/j.powtec.2021.11.040

16. Numerical study on targeted delivery of magnetic drug particles in realistic human lung

Author:
Chenbing Wu; Weiwei Yan; Rou Chen; Yang Liu; Guozhan Li
Source:
Powder technology 2022 v.397 pp. 116984
ISSN:
0032-5910
Subject:
breathing; drugs; humans; lungs; magnetic fields; models; mouth; particle size; technology; turbulent flow
Abstract:
... Inhalation of medical drug particles through human airway is widely utilized for the remedy of lung diseases. Due to the complexities of airway morphology, flow turbulence and particle deposition, the drug delivery efficiency to the morbid region of lung is always unsatisfactory. In this research, a 3D anatomically accurate human airway model from oral cavity to lung is reconstructed, and the larg ...
DOI:
10.1016/j.powtec.2021.11.028

17. Particle decontamination from elliptical bubbles in scrubbing pools simulated using Eulerian–Lagrangian method

Author:
Dan Sun
Source:
Powder technology 2022 v.397 pp. 117003
ISSN:
0032-5910
Subject:
aerosols; coagulation; decontamination; swarms
Abstract:
... The particle dynamics in the rising bubble swarm is dominant in the scrubbing pools to remove the contaminated aerosol/particles. These gas bubbles occurred in the three shapes, spherical for small bubbles, ellipsoidal for median-size bubbles and spherical cap for large bubbles. In this paper, the aerosol particle decontamination in the median-sized rising bubble in the ellipsoidal shape is simula ...
DOI:
10.1016/j.powtec.2021.11.047

18. Particle scale modelling of melt pool dynamics and pore formation in selective laser melting additive manufacturing

Author:
Erlei Li; Zongyan Zhou; Lin Wang; Haopeng Shen; Ruiping Zou; Aibing Yu
Source:
Powder technology 2022 v.397 pp. 117012
ISSN:
0032-5910
Subject:
liquids; mathematical models; solidification
Abstract:
... Selective laser melting is an advanced additive manufacturing technology to use laser beams to melt metal powder and fabricate parts layer by layer. To understand the involved multi-physics, a validated mathematical model is employed in this work to assess effect of material properties such as powder melting and solidification coefficients and mushy zone constant. The results show that large pores ...
DOI:
10.1016/j.powtec.2021.11.056

19. Particle subgrid scale modeling in hybrid RANS/LES of turbulent channel flow at low to moderate Reynolds number

Author:
Mohamed Aly Sayed; Abdel Dehbi; Bojan Niceno; Konstantin Mikityuk
Source:
Powder technology 2022 v.397 pp. 117013
ISSN:
0032-5910
Subject:
Reynolds number; dynamic models; equations; hybrids; viscosity
Abstract:
... Particle dispersion in a periodic channel is studied using the elliptic relaxation hybrid RANS/LES (ER-HRL) model. This approach employs a four-equation linear eddy viscosity (LEV) model while in Reynolds Averaged Navier-Stokes (RANS) mode near the wall, and switches to the LES Smagorinsky dynamic model in the outer flow region. We perform a systematic analysis of the dispersion of six sets of par ...
DOI:
10.1016/j.powtec.2021.11.057

20. Performances of three models in predicting packing densities and optimal mixing fractions of mixtures of micropowders with different sizes

Author:
Wenchao Du; Ming Li; Zhijian Pei; Chao Ma
Source:
Powder technology 2022 v.397 pp. 117095
ISSN:
0032-5910
Subject:
models; prediction; technology
Abstract:
... Mixing powders with different sizes is a common method to tune the packing density. For the first time, predicted packing density and optimal mixing fraction from different linear packing models (de Larrard's, Kwan's, and Yu's) are compared against the experimental results of mixtures of micropowders (with different particle sizes: 2, 10, and 70 μm). Regarding the predicted packing density, Kwan's ...
DOI:
10.1016/j.powtec.2021.117095