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Dodds D, Sarhan AAR, Naser J. Experimental and numerical study of free-falling streams of particles impacting an inclined surface. EXPERIMENTAL AND COMPUTATIONAL MULTIPHASE FLOW 2023; 5:381-395. [DOI: 10.1007/s42757-022-0144-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 08/06/2022] [Accepted: 08/15/2022] [Indexed: 09/02/2023]
Abstract
AbstractThis paper presents a detailed experimental and numerical analysis of free-falling particle streams impacting a 45° inclined surface of differing materials. The particles used in this study were glass spheres with average diameters of 136 and 342 µm and a density of 2500 kg/m3. The three mass flow rates considered are 50, 150, and 250 grams per minute (gpm). The effect of wall material on the collision process was also analysed. Special attention was paid to the influence of wall roughness. Therefore, a plate of stainless steel with polished surface, an aluminium sheet, and a Perspex plate with similar properties to those of the rest of the wall sections were used. The experimental data were used to improve and validate a wall collision model in the frame of the Lagrangian approach. A new drag force formula that includes the effects of particle concentration as well as particle Reynolds number was implemented into commercially available codes from CFX4-4 package. It was found that the improved CFD model better predicted the experimental measurements for the particle rebound properties. The rough-wall model in these results showed greater effect on smaller particles than on larger particles. The results also showed that the improved CFD model predicted the velocity changes slightly better than the standard model, and this was confirmed by both the quantitative velocity comparisons and the qualitative concentration plots. Finally, the inclusion of the particle-particle collision was shown to be the dominant factor in providing the dispersion of the particles post collision. Without a sufficient particle-particle collision model, the standard model showed all particles behaving virtually identical, with the main particle stream continuing after the collision process.
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Dodds D, Sarhan AAR, Naser J. CFD Investigation into the Effects of Surrounding Particle Location on the Drag Coefficient. FLUIDS 2022; 7:331. [DOI: 10.3390/fluids7100331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
In the simulation of dilute gas-solid flows such as those seen in many industrial applications, the Lagrangian Particle Tracking method is used to track packets of individual particles through a converged fluid field. In the tracking of these particles, the most dominant forces acting upon the particles are those of gravity and drag. In order to accurately predict particle motion, the determination of the aforementioned forces become of the upmost importance, and hence an improved drag force formula was developed to incorporate the effects of particle concentration and particle Reynolds number. The present CFD study examines the individual effects of particles located both perpendicular and parallel to the flow direction, as well as the effect of a particle entrain within an infinite matrix of evenly distributed particles. Results show that neighbouring particles perpendicular to the flow (Model 2) have an effect of increasing the drag force at close separation distances, but this becomes negligible between 5–10 particle diameters depending on particle Reynolds number (Rep). When entrained in an infinite line of particles co-aligned with the flow (Model 1), the drag force is remarkably reduced at close separation distances and increases as the distance increases. The results of the infinite matrix of particles (Model 3) show that, although not apparent in the individual model, the effect of side particles is experienced many particle diameters downstream.
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Song Z, Li Q, Li F, Chen Y, Ullah A, Chen S, Wang W. MP-PIC simulation of dilute-phase pneumatic conveying in a horizontal pipe. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang H, Tan Z, Kuang S, Yu A. Numerical modeling and analysis of particle-fluid flow and wall erosion in centrifugal slurry pumps under different solid concentrations. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Chen L, Sun Z, Ma H, Li P, Ma G, Gao K, Zhang Y. Energy loss caused by the elbow of stiff shotcrete pneumatic conveying based on response surface method and CFD-DEM. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Czernek K, Skotnicka E, Witczak S. Aerodynamics of two-phase gas-solid flow in a flat suction nozzle during vacuum pneumatic transport. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Pure Electric Sweeper Performance Analysis and Test Verification of Dust Extraction Port. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12105188] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Purely electric sweepers are widely used in the urban sanitation industry due to their emission-free nature and ease of miniaturisation. The dust suction port is the key to the dust suction system of the sweeper, and improving the design level of the dust suction port of the sweeper can effectively improve the operational performance of the sweeper. Using the company’s self-developed Ruiqing S26 pure electric sweeper as the research object, a CFD (Computational Fluid Dynamics) method was used to analyse the influence of the dust suction port structure parameters (front baffle tilt angle, outlet diameter) and sweeper operation parameters (driving speed, operating pressure) on the dust suction effect of the sweeper, and was verified through real vehicle tests. The results of the study show that changing the angle and outlet diameter results in a change in the flow field characteristics and, consequently, the same change in the removal efficiency, with 65° and 160 mm being the optimum angle and outlet diameter, respectively. The tests investigated the flow field characteristics of the dust extraction opening and the removal efficiency. This study can provide theoretical reference for performance optimisation and parameter matching of the sweeper.
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Ji Y, Hao Y, Yi N, Guan T, Gao D. Particle flow regime in a swirling pneumatic conveying system. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117328] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Chen L, Sun Z, Ma H, Pan G, Li P, Gao K. Flow characteristics of pneumatic conveying of stiff shotcrete based on CFD-DEM method. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117109] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Chen WH, Chang CM, Mutuku JK, Lam SS, Lee WJ. Aerosol deposition and airflow dynamics in healthy and asthmatic human airways during inhalation. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125856. [PMID: 34492805 DOI: 10.1016/j.jhazmat.2021.125856] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 03/13/2021] [Accepted: 04/06/2021] [Indexed: 05/07/2023]
Abstract
Inhalation of aerosols such as pharmaceutical aerosols or virus aerosol uptake is of great concern to the human population. To elucidate the underlying aerosol dynamics, the deposition fractions (DFs) of aerosols in healthy and asthmatic human airways of generations 13-15 are predicted. The Navier-stokes equations governing the gaseous phase and the discrete phase model for particles' motion are solved using numerical methods. The main forces responsible for deposition are inertial impaction forces and complex secondary flow velocities. The curvatures and sinusoidal folds in the asthmatic geometry lead to the formation of complex secondary flows and hence higher DFs. The intensities of complex secondary flows are strongest at the generations affected by asthma. The DF in the healthy airways is 0%, and it ranges from 1.69% to 52.93% in the asthmatic ones. From this study, the effects of the pharmaceutical aerosol particle diameters in the treatment of asthma patients can be established, which is conducive to inhibiting the inflammation of asthma airways. Furthermore, with the recent development of COVID-19 which causes pneumonia, the predicted physics and effective simulation methods of bioaerosols delivery to asthma patients are vital to prevent the exacerbation of the chronic ailment and the epidemic.
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Affiliation(s)
- Wei-Hsin Chen
- Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan; Research Center for Smart Sustainable Circular Economy, Tunghai University, Taichung 407, Taiwan; Department of Mechanical Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan.
| | - Che-Ming Chang
- Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan; International Master Degree Program on Energy Engineering, National Cheng Kung University, Tainan 701, Taiwan
| | - Justus Kavita Mutuku
- Department of Environmental Engineering, National Cheng Kung University, Tainan 701, Taiwan; Center for Environmental Toxin and Emerging-Contaminant Research, Cheng Shiu University, Kaohsiung 833, Taiwan; Super micro mass research and technology center, Cheng Shiu University, Kaohsiung 833, Taiwan
| | - Su Shiung Lam
- Pyrolysis Technology Research Group, Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, Kuala Nerus 21030, Terengganu, Malaysia; Henan Province Engineering Research Center for Biomass Value-Added Products, Henan Agricultural University, Zhengzhou 450002, Henan, China
| | - Wen-Jhy Lee
- Department of Environmental Engineering, National Cheng Kung University, Tainan 701, Taiwan
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Jia W, Yan J. Pressure drop characteristics and minimum pressure drop velocity for pneumatic conveying of polyacrylamide in a horizontal pipe with bends at both ends. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ding T, Deng Z, Hou X, Liu Y, Liu Y, Li M, Li M. Investigation on the simulation approach for Martian rarefied aeolian activities based on discrete element method. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.05.055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Dodds D, Sarhan A, Naser J. Experimental and numerical study of drag forces on particles in clusters. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.05.082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Kang R, Liu H. An integrated model of predicting sand erosion in elbows for multiphase flows. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.02.072] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Yang D, Xing B, Li J, Wang Y, Gao K, Zhou F, Xia Y, Wang C. Experimental study on the injection performance of the gas-solid injector for large coal particles. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.11.087] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Guo J, Chen Z, Shen B, Wang J, Yang L. Numerical study on characteristics of particle deposition efficiency on different walls of 90° square bend. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.01.059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Alkassar Y, Agarwal VK, Pandey RK, Behera N. Analysis of dense phase pneumatic conveying of fly ash using CFD including particle size distribution. PARTICULATE SCIENCE AND TECHNOLOGY 2020. [DOI: 10.1080/02726351.2020.1727592] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Yassin Alkassar
- Centre for Automotive Research and Tribology (former ITMMEC), Indian Institute of Technology Delhi, New Delhi, India
| | - Vijay K. Agarwal
- Centre for Automotive Research and Tribology (former ITMMEC), Indian Institute of Technology Delhi, New Delhi, India
| | - R. K. Pandey
- Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India
| | - Niranjana Behera
- School of Mechanical Engineering (SMEC), VIT University, Vellore, India
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Ge L, Gui N, Yang X, Tu J, Jiang S. Effects of aspect ratio and component ratio on binary-mixed discharging pebble flow in hoppers. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.07.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kuang S, Li K, Yu A. CFD-DEM Simulation of Large-Scale Dilute-Phase Pneumatic Conveying System. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b03008] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shibo Kuang
- ARC Research Hub for Computational Particle Technology, Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Ke Li
- ARC Research Hub for Computational Particle Technology, Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Aibing Yu
- ARC Research Hub for Computational Particle Technology, Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia
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