Pub Date : 2025-02-25DOI: 10.1016/j.powtec.2025.120850
Zhong Xiang , Xi Chen , Theodore J. Heindel
This study explores the gas-solid flow hydrodynamics in spouted beds with various types of draft tubes using X-ray computed tomography (XCT). We investigate the effects of different draft tube types (non-porous, porous, and open-sided), gas velocities, and tube diameters on the spouting behavior. XCT allows for the noninvasive, three-dimensional reconstruction of time-average voidage distribution within the spouted beds. Our findings indicate that draft tube types and diameters significantly influence the minimum spouting velocity, voidage distribution, and particle flow patterns. Porous and open-sided tubes demonstrate unique gas-solid flow characteristics, such as improved particle circulation and enhanced radial mixing, compared to non-porous tubes. This study provides critical insights into the mechanisms of spouting jet stability and the optimization of draft tube designs for industrial applications.
{"title":"Investigating gas-solid flow hydrodynamics in spouted beds with a draft tube using XCT: The role of tube types, gas velocity, and diameter","authors":"Zhong Xiang , Xi Chen , Theodore J. Heindel","doi":"10.1016/j.powtec.2025.120850","DOIUrl":"10.1016/j.powtec.2025.120850","url":null,"abstract":"<div><div>This study explores the gas-solid flow hydrodynamics in spouted beds with various types of draft tubes using X-ray computed tomography (XCT). We investigate the effects of different draft tube types (non-porous, porous, and open-sided), gas velocities, and tube diameters on the spouting behavior. XCT allows for the noninvasive, three-dimensional reconstruction of time-average voidage distribution within the spouted beds. Our findings indicate that draft tube types and diameters significantly influence the minimum spouting velocity, voidage distribution, and particle flow patterns. Porous and open-sided tubes demonstrate unique gas-solid flow characteristics, such as improved particle circulation and enhanced radial mixing, compared to non-porous tubes. This study provides critical insights into the mechanisms of spouting jet stability and the optimization of draft tube designs for industrial applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120850"},"PeriodicalIF":4.5,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-25DOI: 10.1016/j.powtec.2025.120841
Shukai Zhang , Xiaopeng Wang , Lu Zhang
Granular convection typically refers to the cyclic flow phenomenon observed in dense granular systems subjected to vertical sinusoidal vibration, where discrete particles descend along the container walls and rise in the center of the container. This process plays a crucial role in the overall transport and mixing of particles and has important applications in vibration processing techniques, such as Resonant Acoustic Mixing (RAM). However, current research on the changes in convection flow patterns and underlying mechanisms under conditions of low aspect ratio containers (< 1:4), high filling ratios of granular systems (nearly full), and inclined container walls is limited. Under these atypical conditions, the forms of granular convection and the associated dynamical mechanisms remain unclear. This study focuses on the effects of these three parameters on granular convection, employing the Discrete Element Method (DEM) to simulate and analyze granular convection phenomena in a 3D container. The results indicate that a multilayer convection pattern emerges under low aspect ratio conditions, a centrosymmetric convection pattern appears under nearly full-filling conditions, and a reverse convection pattern develops under inclined wall conditions. Furthermore, we analyze and explain the dynamical mechanisms behind these three unconventional convection patterns: the multilayer convection pattern arises from the longer time required for vibrations to propagate to higher positions in low aspect ratio conditions; the centrosymmetric convection pattern is caused by the top of the container becoming a new source of excitation; the dynamical mechanism of the reverse convection pattern not only involves shear forces along the walls but also considers the normal support force from the walls as a new driving force for convection. These findings are expected to provide theoretical support for granular convection control.
{"title":"The influence of filling ratio and container geometry on granular convection and the dynamical mechanisms of three unconventional convection patterns in a vibrated granular bed","authors":"Shukai Zhang , Xiaopeng Wang , Lu Zhang","doi":"10.1016/j.powtec.2025.120841","DOIUrl":"10.1016/j.powtec.2025.120841","url":null,"abstract":"<div><div>Granular convection typically refers to the cyclic flow phenomenon observed in dense granular systems subjected to vertical sinusoidal vibration, where discrete particles descend along the container walls and rise in the center of the container. This process plays a crucial role in the overall transport and mixing of particles and has important applications in vibration processing techniques, such as Resonant Acoustic Mixing (RAM). However, current research on the changes in convection flow patterns and underlying mechanisms under conditions of low aspect ratio containers (< 1:4), high filling ratios of granular systems (nearly full), and inclined container walls is limited. Under these atypical conditions, the forms of granular convection and the associated dynamical mechanisms remain unclear. This study focuses on the effects of these three parameters on granular convection, employing the Discrete Element Method (DEM) to simulate and analyze granular convection phenomena in a 3D container. The results indicate that a multilayer convection pattern emerges under low aspect ratio conditions, a centrosymmetric convection pattern appears under nearly full-filling conditions, and a reverse convection pattern develops under inclined wall conditions. Furthermore, we analyze and explain the dynamical mechanisms behind these three unconventional convection patterns: the multilayer convection pattern arises from the longer time required for vibrations to propagate to higher positions in low aspect ratio conditions; the centrosymmetric convection pattern is caused by the top of the container becoming a new source of excitation; the dynamical mechanism of the reverse convection pattern not only involves shear forces along the walls but also considers the normal support force from the walls as a new driving force for convection. These findings are expected to provide theoretical support for granular convection control.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120841"},"PeriodicalIF":4.5,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-25DOI: 10.1016/j.powtec.2025.120842
Chao Wang, Guoji Ma, Hui Cao, Xueling Ji, Jiamin Ye
Screw conveyors are widely used in industries such as construction, grain processing, and mining due to their low cost, ease of operation, and simple structure. Real-time measurement of the operational status of screw conveyors is crucial for enhancing conveyor efficiency, reducing energy consumption, and ensuring the safety of the production process. However, effective real-time measurement methods are currently lacking. This paper designs an electrostatic sensor that synchronously accounts for the influence of screw blades and finds that the detected electrostatic signals contain distinct primary and secondary frequency information. The signals are extracted using Harmonic Wavelet Transform (HWT), and the coal powder particle signals and screw blade signals are distinguished based on the presence of time delays in the decomposed signals. The results indicate that the primary frequency primarily reflects the motion of the screw blades, while the secondary frequency mainly corresponds to the motion of the coal dust particles. Using the proposed velocity measurement method, the absolute value of the relative error for the measured screw rotation speed was less than 1 %, and the absolute value of the relative error for the coal dust particle lifting speed was less than 2 %.
{"title":"Measurement method for screw conveyors based on electrostatic primary and secondary frequency signals","authors":"Chao Wang, Guoji Ma, Hui Cao, Xueling Ji, Jiamin Ye","doi":"10.1016/j.powtec.2025.120842","DOIUrl":"10.1016/j.powtec.2025.120842","url":null,"abstract":"<div><div>Screw conveyors are widely used in industries such as construction, grain processing, and mining due to their low cost, ease of operation, and simple structure. Real-time measurement of the operational status of screw conveyors is crucial for enhancing conveyor efficiency, reducing energy consumption, and ensuring the safety of the production process. However, effective real-time measurement methods are currently lacking. This paper designs an electrostatic sensor that synchronously accounts for the influence of screw blades and finds that the detected electrostatic signals contain distinct primary and secondary frequency information. The signals are extracted using Harmonic Wavelet Transform (HWT), and the coal powder particle signals and screw blade signals are distinguished based on the presence of time delays in the decomposed signals. The results indicate that the primary frequency primarily reflects the motion of the screw blades, while the secondary frequency mainly corresponds to the motion of the coal dust particles. Using the proposed velocity measurement method, the absolute value of the relative error for the measured screw rotation speed was less than 1 %, and the absolute value of the relative error for the coal dust particle lifting speed was less than 2 %.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120842"},"PeriodicalIF":4.5,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dust mitigation is one of the most critical challenges in lunar exploration activities, and an electrodynamic dust shield (EDS) has been developed as a promising technology for dust removal. This paper presents an investigation combining an EDS with the assistance of low-frequency vibrations. Cleaning experiments were conducted on size-sorted particles of the lunar-regolith simulant using an EDS system mounted on vibrating stages, where the vibration frequency, amplitude, strength, and direction could be varied. Experimental results revealed that the assistance of horizontal vibration combined with the electrostatic force led to higher removal efficiencies for small- and medium-sized particles (with diameters less than 25 μm, in the range 50–75 μm, respectively). The horizontal vibration caused the rotational motion of aggregates of small- and medium-sized particles, enhancing their transport by the electrostatic traveling wave. The vibration itself was the dominant force that contributed to cleaning of the larger particles with diameters of 250–500 μm. Increasing the vibration intensity improved removal efficiency.
{"title":"Cleaning performance of an electrodynamic dust shield under low-frequency vibrations","authors":"Ryudai Nitano , Shunsuke Mitsunaga , Shuntaro Yamato , Kosuke Tanaka , Hiroshi Kanamori , Masato Adachi","doi":"10.1016/j.powtec.2025.120845","DOIUrl":"10.1016/j.powtec.2025.120845","url":null,"abstract":"<div><div>Dust mitigation is one of the most critical challenges in lunar exploration activities, and an electrodynamic dust shield (EDS) has been developed as a promising technology for dust removal. This paper presents an investigation combining an EDS with the assistance of low-frequency vibrations. Cleaning experiments were conducted on size-sorted particles of the lunar-regolith simulant using an EDS system mounted on vibrating stages, where the vibration frequency, amplitude, strength, and direction could be varied. Experimental results revealed that the assistance of horizontal vibration combined with the electrostatic force led to higher removal efficiencies for small- and medium-sized particles (with diameters less than 25 μm, in the range 50–75 μm, respectively). The horizontal vibration caused the rotational motion of aggregates of small- and medium-sized particles, enhancing their transport by the electrostatic traveling wave. The vibration itself was the dominant force that contributed to cleaning of the larger particles with diameters of 250–500 μm. Increasing the vibration intensity improved removal efficiency.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120845"},"PeriodicalIF":4.5,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Acoustic air-jet generators show great potential in eliminating fire smokes. In this paper, to enhance the agglomeration performance and minimize the negative impact of exhaust airflow, a novel Hartmann whistle structure with swirl characteristics is designed. Experimental results indicate that the swirl blades have minimal effect on the fundamental frequency but reduce the sound amplitude as the blade size increases. When the blade height exceeds a certain size, the sound amplitude significantly drops. Compared to the structure without blades, the blades at the nozzle increase agglomeration efficiency by 24.5 % - 44.2 %, while the blades at the horn throat increase it by 21.4 % - 31.2 %. Overall, the agglomeration effect of the sound source with swirl blades decreases as the side opening sizes increase. In contrast, the sound source without blades shows a trend of first increasing and then decreasing, reaching the maximum at the flow-sound-separation point.
{"title":"Experimental study on the agglomeration of fire smoke by flow-sound-separation Hartmann whistle with swirl characteristics","authors":"Weihua Li, Guangxue Zhang, Shu Liu, Sirui Tong, Dingkun Yuan, Yunchao Li, Hailin Gu, Jiangrong Xu","doi":"10.1016/j.powtec.2025.120835","DOIUrl":"10.1016/j.powtec.2025.120835","url":null,"abstract":"<div><div>Acoustic air-jet generators show great potential in eliminating fire smokes. In this paper, to enhance the agglomeration performance and minimize the negative impact of exhaust airflow, a novel Hartmann whistle structure with swirl characteristics is designed. Experimental results indicate that the swirl blades have minimal effect on the fundamental frequency but reduce the sound amplitude as the blade size increases. When the blade height exceeds a certain size, the sound amplitude significantly drops. Compared to the structure without blades, the blades at the nozzle increase agglomeration efficiency by 24.5 % - 44.2 %, while the blades at the horn throat increase it by 21.4 % - 31.2 %. Overall, the agglomeration effect of the sound source with swirl blades decreases as the side opening sizes increase. In contrast, the sound source without blades shows a trend of first increasing and then decreasing, reaching the maximum at the flow-sound-separation point.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120835"},"PeriodicalIF":4.5,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-24DOI: 10.1016/j.powtec.2025.120836
Ruoyu Han , Shuhan Liu , Jingran Li , Jie Bai , Xinxuan Xian , Chen Li , Jinhao Wu , Sichao Qin , Xi Chen
The ability to synthesize nanoparticles (NPs) with desirable structural/compositional properties has been the driving goal of functional material applications. As a “one-step” evaporation-condensation method for NPs production, the electrical explosion can achieve ultrafast heating/quenching rates (dT/dt ∼ 1010 K/s) of current-carrying metals. This study proposes a spatial filter to control explosion energy release and product quenching procedure. A supersonic plasma jet (>2 Mach) erupts through the small hole of the filter, forming a high-pressure homogenizer structure, enhancing the diffusion and cooling down of explosion products. Microscopic characterization indicates NPs size decreases from 46.3±16.7 to 27.7±7.7 nm. Structural study has yielded two assembly routes of NPs: the first involves the top-down approach (Cu particles >100 nm), while the second concerns the bottom-up way (Cu and CuxO NPs <100 nm). The improved performance is attributed to the multi-stage control of explosion products, resulting in less instability development and a more reasonable evaporation-condensation process.
{"title":"Toward refinement and homogenization of heterogeneous metal nanoparticle prepared by electrical explosion with spatial filter","authors":"Ruoyu Han , Shuhan Liu , Jingran Li , Jie Bai , Xinxuan Xian , Chen Li , Jinhao Wu , Sichao Qin , Xi Chen","doi":"10.1016/j.powtec.2025.120836","DOIUrl":"10.1016/j.powtec.2025.120836","url":null,"abstract":"<div><div>The ability to synthesize nanoparticles (NPs) with desirable structural/compositional properties has been the driving goal of functional material applications. As a “one-step” evaporation-condensation method for NPs production, the electrical explosion can achieve ultrafast heating/quenching rates (d<em>T</em>/d<em>t</em> ∼ 10<sup>10</sup> K/s) of current-carrying metals. This study proposes a spatial filter to control explosion energy release and product quenching procedure. A supersonic plasma jet (>2 Mach) erupts through the small hole of the filter, forming a high-pressure homogenizer structure, enhancing the diffusion and cooling down of explosion products. Microscopic characterization indicates NPs size decreases from 46.3<sup>±16.7</sup> to 27.7<sup>±7.7</sup> nm. Structural study has yielded two assembly routes of NPs: the first involves the top-down approach (Cu particles >100 nm), while the second concerns the bottom-up way (Cu and Cu<sub>x</sub>O NPs <100 nm). The improved performance is attributed to the multi-stage control of explosion products, resulting in less instability development and a more reasonable evaporation-condensation process.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120836"},"PeriodicalIF":4.5,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Supercritical water gasification is an innovative way to clean and green coal conversion. Nevertheless, the flow dynamics of the fluid-particle introduced into the reactor via the nozzle still require further investigation. In this study, the fluid-particle flow dynamics within the supercritical water environment are examined by an improved Coarse-grained CFD-DEM method. The fluid flow field, particle evolution process, particle velocity and temperature distributions, as well as the particle forces and energy variations during evolution are analyze. The primary findings indicate that the instability of the jet flow field in a supercritical water environment is amplified with a reduction in incident temperature, thereby enhancing heat transfer and mixing. The violent perturbations between the fluid and the particles result in a more complex particle evolution process. In contrast, incidence conditions of transcritical and supercritical have no significant effect on the particle velocity distribution. Furthermore, the variation of particle temperature along the jet axis approaches the incident temperature as the incident temperature increases. Additionally, the particle drag force accounts for 70 % of the total force, and its translational and rotational kinetic energy decreases with increasing incident temperature. This research reveals the mechanism of particle dispersion in supercritical water environment, and supplies a reference for optimized configuration of supercritical water gasification reactor and the improvement of model.
{"title":"Numerical simulation of particle jet in supercritical water environment based on an improved coarse-grained CFD-DEM method","authors":"Chuan Zhang, Shenghui Guo, Fei Shang, Zhiwei Ge, Liejin Guo","doi":"10.1016/j.powtec.2025.120833","DOIUrl":"10.1016/j.powtec.2025.120833","url":null,"abstract":"<div><div>Supercritical water gasification is an innovative way to clean and green coal conversion. Nevertheless, the flow dynamics of the fluid-particle introduced into the reactor via the nozzle still require further investigation. In this study, the fluid-particle flow dynamics within the supercritical water environment are examined by an improved Coarse-grained CFD-DEM method. The fluid flow field, particle evolution process, particle velocity and temperature distributions, as well as the particle forces and energy variations during evolution are analyze. The primary findings indicate that the instability of the jet flow field in a supercritical water environment is amplified with a reduction in incident temperature, thereby enhancing heat transfer and mixing. The violent perturbations between the fluid and the particles result in a more complex particle evolution process. In contrast, incidence conditions of transcritical and supercritical have no significant effect on the particle velocity distribution. Furthermore, the variation of particle temperature along the jet axis approaches the incident temperature as the incident temperature increases. Additionally, the particle drag force accounts for 70 % of the total force, and its translational and rotational kinetic energy decreases with increasing incident temperature. This research reveals the mechanism of particle dispersion in supercritical water environment, and supplies a reference for optimized configuration of supercritical water gasification reactor and the improvement of model.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120833"},"PeriodicalIF":4.5,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-24DOI: 10.1016/j.powtec.2025.120838
Solange Magalhães , Magnus Norgren , Luís Alves , Bruno Medronho , Maria da Graça Rasteiro
This study explores the performance of novel cellulose-derived sustainable flocculants in the flocculation of different model microplastics (MPs), including polyethylene (PE), polyethylene terephthalate (PET) and polyvinyl chloride (PVC). The influence of key parameters, such as pH, flocculant structure and concentration was evaluated by Laser Diffraction Spectroscopy (LDS) and optical microscopy to access their effects on flocculation performance, kinetics and floc structure. The results reveal that a bioflocculant concentration of 0.001 g·mL−1 is ideal for effective flocculation, as lower concentrations lead to insufficient floc growth. While electrostatic interactions are a dominant factor in the flocculation process, the study also highlights the role of hydrophobic interactions, its contribution depending on the characteristics of the MPs. Overall, this research highlights the importance of understanding the key interactions governing the flocculation process. It further paves the way for designing and fine-tuning cellulose-based flocculants with improved efficiency and optimized dosages for effective MPs removal strategies.
{"title":"Tailored cellulose-based flocculants for microplastics removal: Mechanistic insights, pH influence, and efficiency optimization","authors":"Solange Magalhães , Magnus Norgren , Luís Alves , Bruno Medronho , Maria da Graça Rasteiro","doi":"10.1016/j.powtec.2025.120838","DOIUrl":"10.1016/j.powtec.2025.120838","url":null,"abstract":"<div><div>This study explores the performance of novel cellulose-derived sustainable flocculants in the flocculation of different model microplastics (MPs), including polyethylene (PE), polyethylene terephthalate (PET) and polyvinyl chloride (PVC). The influence of key parameters, such as pH, flocculant structure and concentration was evaluated by Laser Diffraction Spectroscopy (LDS) and optical microscopy to access their effects on flocculation performance, kinetics and floc structure. The results reveal that a bioflocculant concentration of 0.001 g·mL<sup>−1</sup> is ideal for effective flocculation, as lower concentrations lead to insufficient floc growth. While electrostatic interactions are a dominant factor in the flocculation process, the study also highlights the role of hydrophobic interactions, its contribution depending on the characteristics of the MPs. Overall, this research highlights the importance of understanding the key interactions governing the flocculation process. It further paves the way for designing and fine-tuning cellulose-based flocculants with improved efficiency and optimized dosages for effective MPs removal strategies.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120838"},"PeriodicalIF":4.5,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-23DOI: 10.1016/j.powtec.2025.120821
Pengzhan Liu , Xiaopeng Shang , Morgan WeiZhi Tan , Duojia Shi , Xin Zhang , Guicai Liu , Shi Hao Lim , Hang Yin , Man Pun Wan , Grzegorz Lisak , Bing Feng Ng
Acoustic agglomeration (AA), which harnesses sound waves to enhance particle collision for agglomeration, is a promising technology for aerosol emission control. In addition to direct experimentation, numerical modeling has become another type of useful auxiliary toolsets for AA research. However, the existing modeling methods are computationally demanding and fail to precisely capture critical information on evolution of particle statistics with a versatile manner. Here, we present a novel temporal population balance modeling (PBM) methodology for AA processes using an efficient fixed-pivot strategy, which is capable of implementing rapid and versatile numerical simulations to investigate time-domain evolution of statistical properties of aerosol particles under sound waves. The reliability of the algorithm is validated through a classic analytical solution and a set of experimental results from a previous study. Furthermore, by incorporating multiple AA kernels, we cover a wide spectrum of aerosol and acoustic conditions and numerically investigate and analyze a series of simulation cases. This universal and robust PBM tool based on the fixed pivot method provides a rapid approach to theoretically predict, visualize, and understand sound-induced evolution behaviors of aerosol particle populations, which could further be favored by other physical aerosol agglomeration topics.
{"title":"Rapid and versatile numerical simulations of acoustic agglomeration by the fixed pivot-based population balance modeling","authors":"Pengzhan Liu , Xiaopeng Shang , Morgan WeiZhi Tan , Duojia Shi , Xin Zhang , Guicai Liu , Shi Hao Lim , Hang Yin , Man Pun Wan , Grzegorz Lisak , Bing Feng Ng","doi":"10.1016/j.powtec.2025.120821","DOIUrl":"10.1016/j.powtec.2025.120821","url":null,"abstract":"<div><div>Acoustic agglomeration (AA), which harnesses sound waves to enhance particle collision for agglomeration, is a promising technology for aerosol emission control. In addition to direct experimentation, numerical modeling has become another type of useful auxiliary toolsets for AA research. However, the existing modeling methods are computationally demanding and fail to precisely capture critical information on evolution of particle statistics with a versatile manner. Here, we present a novel temporal population balance modeling (PBM) methodology for AA processes using an efficient fixed-pivot strategy, which is capable of implementing rapid and versatile numerical simulations to investigate time-domain evolution of statistical properties of aerosol particles under sound waves. The reliability of the algorithm is validated through a classic analytical solution and a set of experimental results from a previous study. Furthermore, by incorporating multiple AA kernels, we cover a wide spectrum of aerosol and acoustic conditions and numerically investigate and analyze a series of simulation cases. This universal and robust PBM tool based on the fixed pivot method provides a rapid approach to theoretically predict, visualize, and understand sound-induced evolution behaviors of aerosol particle populations, which could further be favored by other physical aerosol agglomeration topics.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120821"},"PeriodicalIF":4.5,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-23DOI: 10.1016/j.powtec.2025.120803
M. Dikty
When reducing the conveying gas velocity during the pneumatic transport of fine-grained bulk materials, the process goes through a wide variety of flow modes. Along this reduction in velocity, there are pressure fluctuations of varying degrees, the so-called pressure pulsations. These have been intensively studied over the past 30 years, mainly about the associated flow mode. In this work, the pressure pulsation is systematically investigated. For this purpose, conveying tests were carried out with cement as bulk solid and varying solid loadings and air mass flows, starting with the dilute mode, and ending with pipe blockage. The pressures were sampled and evaluated. Criteria for assessing pressure pulsations are applied. These are systematically related to the solid loading ratio (SLR), the Froude number (gas velocity) and the Euler number related to the pressure drop, based on a dimensional analysis. The resulting dependencies are evaluated qualitatively and quantitatively.
{"title":"Experimental investigation and analysis of pressure fluctuations in pneumatic conveying systems with fine bulk solids","authors":"M. Dikty","doi":"10.1016/j.powtec.2025.120803","DOIUrl":"10.1016/j.powtec.2025.120803","url":null,"abstract":"<div><div>When reducing the conveying gas velocity during the pneumatic transport of fine-grained bulk materials, the process goes through a wide variety of flow modes. Along this reduction in velocity, there are pressure fluctuations of varying degrees, the so-called pressure pulsations. These have been intensively studied over the past 30 years, mainly about the associated flow mode. In this work, the pressure pulsation is systematically investigated. For this purpose, conveying tests were carried out with cement as bulk solid and varying solid loadings and air mass flows, starting with the dilute mode, and ending with pipe blockage. The pressures were sampled and evaluated. Criteria for assessing pressure pulsations are applied. These are systematically related to the solid loading ratio (SLR), the Froude number (gas velocity) and the Euler number related to the pressure drop, based on a dimensional analysis. The resulting dependencies are evaluated qualitatively and quantitatively.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120803"},"PeriodicalIF":4.5,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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