Particuology最新文献

{"title":"Simulation of rice grain breakage process based on Tavares UFRJ model","authors":"Shaohang Shen ,&nbsp;Shouyu Ji ,&nbsp;Dan Zhao ,&nbsp;Yanlong Han ,&nbsp;Hao Li ,&nbsp;Ze Sun ,&nbsp;Zhuozhuang Li ,&nbsp;Anqi Li ,&nbsp;Wenyu Feng ,&nbsp;Jiaming Fei ,&nbsp;Fuguo Jia ,&nbsp;Yang Li","doi":"10.1016/j.partic.2024.05.019","DOIUrl":"https://doi.org/10.1016/j.partic.2024.05.019","url":null,"abstract":"<div><p>Understanding the breakage characteristics of rice grains is an important means to reduce rice breakage rate. However, the dynamic breakage mechanism of rice grain is unclear due to the lack of a reasonable breakage model. In this study, the uniaxial compression test and drop weight test of single rice were carried out, the breakage model of rice grain was constructed, the reliability of rice model was verified by the experiment and simulation results. The results showed that the fracture energy distribution of rice can be obtained by uniaxial compression test, the specific fracture energy of rice accords with a lognormal distribution, and the median specific fracture energy of rice is 479.75 J/kg. The damage accumulation coefficient and fragment size distribution of rice can be acquired by drop test, the result of damage accumulation coefficient of rice was 4.3. Rice grain breakage mainly occurs in the milling section of the vertical circulation rice mill.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"93 ","pages":"Pages 65-74"},"PeriodicalIF":4.1,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and numerical investigation of iron ore pellet firing using coupled CFD-DEM method","authors":"Hafez Amani ,&nbsp;Eskandar Keshavarz Alamdari ,&nbsp;Mostafa Keshavarz Moraveji ,&nbsp;Bernhard Peters","doi":"10.1016/j.partic.2024.05.018","DOIUrl":"https://doi.org/10.1016/j.partic.2024.05.018","url":null,"abstract":"<div><p>Iron ore pellets are the main feedstock in ironmaking processes. While extensive research has addressed numerical modeling of the iron ore pellet induration process, little effort has been made to describe the intricate thermochemical processes occurring within the reactor starting from the pellet and particularly at the intra-particle scale. In this regard, discrete-continuous methods like CFD-DEM can generate more realistic, irregular particle assemblies, which leads to significantly more accurate predictions of voidage variation, wall effects, temperature distribution, and associated mass transfer phenomena. This study presents a numerical model based on computational fluid dynamics (CFD) coupled with the discrete element method (DEM) to simulate the thermal induration process of iron ore pellets. The presented model solving heat, mass, and momentum conservation equations for both continuous and discrete phases, provides detailed information on the thermochemical aspects of the process. Pilot-scale induration experiment was conducted to validate model predictions in terms of thermal history and final conversion fraction. It was found that inlet charge specifications, such as particle and pellet size, significantly impact the productivity of pelletizing plants, highlighting the potential of the presented model to optimize the process and improve plant productivity.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"93 ","pages":"Pages 75-86"},"PeriodicalIF":4.1,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Steady-state multiscale CFD simulation of a circulating fluidized bed riser","authors":"Zhaojie Ke ,&nbsp;Yujie Tian ,&nbsp;Fei Li ,&nbsp;Bona Lu ,&nbsp;Wei Wang","doi":"10.1016/j.partic.2024.06.004","DOIUrl":"10.1016/j.partic.2024.06.004","url":null,"abstract":"<div><p>Compared to transient simulation, steady-state simulation of circulating fluidized bed risers is more efficient, but is also harder to perform due to the complex scale-dependency of dense gas-solid flows. In this work, steady-state computational fluid dynamics (CFD) simulation of a riser is performed using the steady energy-minimization multi-scale (EMMS) drag. It is found that the steady state corresponds to an extremely large scale of length and time, thus the grid size required in steady-state simulation is larger than that in transient one. The time-averaged two-fluid model (TFM) coupled with the steady-state EMMS/1M drag model enables a good prediction of the S-shaped, axial solids distribution and the choking transition, whereas the two-phase turbulence and solids stress models are important in predicting the radially core-annular distribution of solids. So far as we know, this is the first time that one can predict the choking transition in a steady-state CFD simulation. Further improvement may need an EMMS modeling of the time-averaged solid stresses.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"93 ","pages":"Pages 54-64"},"PeriodicalIF":4.1,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141403339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Voidage correction method for DEM study of 3D pebble flows in a bed of cycloidal base","authors":"Zirui Xia ,&nbsp;Minglei Shi ,&nbsp;Quan Zou ,&nbsp;Nan Gui ,&nbsp;Xingtuan Yang ,&nbsp;Jiyuan Tu ,&nbsp;Shengyao Jiang","doi":"10.1016/j.partic.2024.06.003","DOIUrl":"https://doi.org/10.1016/j.partic.2024.06.003","url":null,"abstract":"<div><p>Voidage (porosity or void fraction) in packed particles (or pebbles) is of fundamental importance in calculating the pressure drop, obtaining the drag, predicting the bed permeability, estimating the neutron streaming, etc. For the case when particles are deformed, a method of voidage correction during the packing state is proposed using a Discrete Element Method (DEM) simulation of 3D pebble flow inside a bed of cycloidal base. A function to evaluate the remaining volume of a pebble intercepted by horizontal and vertical planes is proposed for voidage calculation. After that, the process of solving voidage distribution is provided in detail. Using this method, the voidage inside the cycloidal-base pebble bed is obtained to refer to reported similar data for validation. This method can be potentially used for dynamical voidage calculation in CFD-DEM simulation which can get suitable voidage distribution after the correction.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"93 ","pages":"Pages 30-40"},"PeriodicalIF":3.5,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141325594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study on the filtration characteristics of fine particles in granular bed filter at high temperature","authors":"Kangning Zhu,&nbsp;Jie Cai,&nbsp;Yuan Li,&nbsp;Xiaoyou Shen,&nbsp;Jianfei Xi,&nbsp;Yunjun Wang,&nbsp;Zhongzhu Gu","doi":"10.1016/j.partic.2024.05.017","DOIUrl":"10.1016/j.partic.2024.05.017","url":null,"abstract":"<div><p>Granular bed filter (GBF) has become one of the current research hot topics due to its excellent performance in removing fine particles. In this paper, a three-dimensional fixed bed GBF filtration model was established and its accuracy was verified. Then, the GBF filtration performance at high temperature were studied. The results demonstrate that elevating the temperature diminishes the filtration efficiency, albeit to a limited extent. The increasing of inlet gas velocity can significantly improve pressure drop for GBF and the filtration efficiency for fine particles of sizes larger than 5 μm. As the diameter of stacked granular particle diameter grows, the filtration efficiency and pressure drop drops. The density of fine particles almost does not affect the filtration efficiency for fine particles of 1∼7 μm, but a higher density leads to a higher filtration efficiency for fine particles of sizes bigger than 9 μm. Additionally, as the fine particles size increases, the change of the filtration efficiency roughly goes through three stages: Stage 1: the filtration efficiency is basically unchanged; Stage 2: the filtration efficiency increases rapidly; Stage 3: the filtration efficiency increases steadily, but the rate of increase slows down. With the increase of the fine particles Stokes number, the filtration efficiency of GBF will pass through two phases of stabilization and rapid increase.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"93 ","pages":"Pages 41-53"},"PeriodicalIF":3.5,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141398414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Boosting Li-ion storage kinetics via constructing layered TiO2 anode","authors":"Jiyue Hou ,&nbsp;Fei Wang ,&nbsp;Enfeng Zhang ,&nbsp;Ying Wang ,&nbsp;Peng Dong ,&nbsp;Yunxiao Wang ,&nbsp;Yiyong Zhang ,&nbsp;Xue Li ,&nbsp;Yingjie Zhang","doi":"10.1016/j.partic.2024.06.002","DOIUrl":"https://doi.org/10.1016/j.partic.2024.06.002","url":null,"abstract":"<div><p>Due to the typical intercalation-deintercalation mechanism, TiO₂ holds great promise as a sustainable anode for next-generation lithium-ion batteries (LIBs). However, commercial TiO₂ (C–TiO₂) is granular and shows slow ionic conductivity, which greatly hinders its development due to sluggish kinetics, leading to low reversible capacity and inferior rate capability. In this study, a two-dimensional layered TiO₂ (L-TiO₂) anode is prepared via a one-step calcination process, which can effectively shorten the lithium ions diffusion path and improve its lithium ions conductivity. We elucidated the enhanced electrochemical performance of L-TiO₂ as an anode in LIBs through pseudocapacitive acceleration of lithium ions intercalation and deintercalation using various characterization techniques, including different scan rate cyclic voltammetry tests, in situ electrochemical impedance spectroscopy, in situ Raman spectroscopy, and in situ X-ray diffraction. In comparison to C–TiO₂ material, L-TiO₂ material showcases remarkable electrochemical performance, achieving a capacity of 166 mAh/g after 100 cycles at 0.1 C. Additionally, the lithium-ion diffusion coefficient calculated for the L-TiO₂ is two orders of magnitude greater, underscoring its potential as a negative electrode material for LIBs.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"93 ","pages":"Pages 22-29"},"PeriodicalIF":3.5,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141325595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of micro spherulitic particles of carbamazepine-hesperetin cocrystal via QESD with enhanced manufacturability and dissolution","authors":"Jinbo Ouyang ,&nbsp;Lishan Liu ,&nbsp;Zichen Ning ,&nbsp;Zhuoshan Gong ,&nbsp;Limin Zhou ,&nbsp;Feiqiang He ,&nbsp;Zhi Gao ,&nbsp;Li Xu ,&nbsp;Shichao Du ,&nbsp;Huaiyu Yang","doi":"10.1016/j.partic.2024.06.001","DOIUrl":"https://doi.org/10.1016/j.partic.2024.06.001","url":null,"abstract":"<div><p>Granulation is an effective method for improving the flowability of drugs, particularly when they are in needle form. Carbamazepine-hesperetin (CBZ-HPE) cocrystal is a needle-like crystal with low solubility and poor flowability, which limits its application. To address this issue, this study aimed to obtain CBZ-HPE microspheres using the quasi-emulsion solvent diffusion (QESD) technique. The preparation process was monitored using polarized light microscopy, and the formation mechanism was elucidated using the radial distribution function (RDF). The microspheres were extensively characterized using PXRD, DSC, TGA, and SEM. Furthermore, the effects of surfactants, contents, and rotational speeds on the morphology and particle size distribution of microspheres were analyzed to determine the optimal experimental conditions. Based on these findings, naringenin and quercetin, the active ingredients of traditional Chinese medicine, were chosen to successfully prepare CBZ-HPE multicomponent microspheres. This research provides a foundation for increasing drug powder properties and drug conjugation through the preparation of microspheres.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"93 ","pages":"Pages 11-21"},"PeriodicalIF":3.5,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141294279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the force chain characteristics with coal dust layer and the three-body contact stiffness","authors":"Xinwei Yang ,&nbsp;Dongxuan Wu ,&nbsp;Hongyue Chen ,&nbsp;Dong Wang","doi":"10.1016/j.partic.2024.05.014","DOIUrl":"https://doi.org/10.1016/j.partic.2024.05.014","url":null,"abstract":"<div><p>To explore the influence of the meso-mechanical behaviors of the wet coal dust layers on the contact stiffness of mechanical bonding surfaces, a three-body contact model incorporating an interface with wet coal dust was constructed based on breakage theory. The model considered the mechanical surface morphology and contact characteristics of the wet coal dust. The force chain evolution laws of the wet coal dust layer were elucidated under the effects of gap filling and the cover layer, and the bearing characteristics of the three-body contact bonding surfaces were revealed by quantitative analyses of the number, length, collimation coefficient, and coordination number of the force chains within the wet coal dust layer. Finally, the three-body normal contact stiffness under various preload forces was computed and experimentally validated. The results demonstrate that the external load transfer path of the three-body contact bonding surfaces was from mechanical surface (macroscopic stress) to wet coal dust layer (mesoscopic force chains) and then to mechanical surface (peaks and valleys). The interactions among these three elements contributed to transforming the distributions of the macroscopic stresses and mesoscopic force chains to the locations at the peaks and valleys of the mechanical surface. Among them, the proportion of short force chains in the wet coal dust layer increased from approximately 0.8% to 91%, while the proportion of long force chains exhibited an opposite changing trend. The force chain collimation coefficient initially increased and subsequently stabilized, reaching a maximum value of 0.93. A large number of broken, small particles in the wet coal dust layer mainly served to fill the gaps among large particles. The maximum relative error between the experimental and simulated values on the three-body contact stiffness is 7.26%, indicating that the simulation results can be an approximate substitute for the experimental results with a certain degree of accuracy and practicality. The research results are of great significance for understanding the contact characteristics of mechanical surfaces containing particulate media.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"92 ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141264090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MnO2-coated nanodiamond-driven photodynamic therapy for enhanced antitumor effect by addressing hypoxia and glutathione depletion","authors":"Jicheng Cui ,&nbsp;Dongmei Zhang ,&nbsp;Hui Qiao ,&nbsp;Zeyu Yan ,&nbsp;Wenxia Zhang ,&nbsp;Yingqi Li","doi":"10.1016/j.partic.2024.05.016","DOIUrl":"https://doi.org/10.1016/j.partic.2024.05.016","url":null,"abstract":"<div><p>The generation of reactive oxygen species (ROS) at the tumor site to induce destruction is emerging as a novel strategy for cancer treatment, which involves photodynamic therapy (PDT). Nevertheless, tumors typically create a hypoxic environment and are equipped with an endogenous antioxidant defense system that could potentially impede the efficiency of the therapeutic approach. To overcome these drawbacks, herein, a tumor microenvironment-responsive the ND-PAA-CD-Ce6@MnO₂ (NPCC@M) delivery system was fabricated by disulfide bond coupling chlorin e6 (Ce6) to nanodiamond (ND) and further wrapped by MnO₂ nanosheets to facilitate PDT. The use of disulfide bond not only stabilizes Ce6 in the blood circulation to prevent premature leakage, but also destroys the antioxidant barrier of overexpressed glutathione (GSH) in tumor cells. Moreover, the outer MnO₂ was rapidly degraded by the endogenous hydrogen peroxide (H₂O₂) in the acidic pH and GSH within the tumor cells, which leads to an abundance of O₂ and while increases the level of ¹O₂ under laser irradiation. The results eventually broke the redox homeostasis and attenuate hypoxia, thereby inducing apoptosis and necrosis of tumor cells. Detailed <em>in vitro</em> and <em>in vivo</em> biological effect has revealed a good biosafety profile and a high tumor suppression effect. Such a novel ND-based system with tumor microenvironment-modulating capability to elevate oxygen content and promote GSH consumption in tumor cells opens new opportunities for enhanced ROS treatment paradigms.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"92 ","pages":"Pages 305-315"},"PeriodicalIF":3.5,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141264093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modification of LiMn0·6Fe0·4PO4 lithium-ion battery cathode materials with a fluorine-doped carbon coating","authors":"Debao Pan ,&nbsp;Ziyuan Liu ,&nbsp;Chengping Li ,&nbsp;Rundong Wan ,&nbsp;Jinsong Wang ,&nbsp;Jiangzhao Chen ,&nbsp;Ding Wang ,&nbsp;Jinkun Liu ,&nbsp;Yingjie Zhang ,&nbsp;Jianhong Yi ,&nbsp;Rui Bao ,&nbsp;Zhengfu Zhang ,&nbsp;Peng Dong","doi":"10.1016/j.partic.2024.05.013","DOIUrl":"https://doi.org/10.1016/j.partic.2024.05.013","url":null,"abstract":"<div><p>In this study, glucose and NH₄F were utilized as sources of carbon and fluorine, respectively, for the synthesis of LiMn_0·6Fe_0·4PO₄ (LMFP) nanoscales. These nanoscales were subsequently modified with varying levels of fluorine-doped carbon through co-precipitation and mechanical ball milling processes. The LMFP, incorporating carbon and varying levels of fluoride ions, exhibit higher specific discharge capacities at 0.2 Cand electrochemical characteristics compared to the original LMFP coated solely with carbon. The inclusion of fluorine-doped carbon in the composite material creates numerous pathways for expeditious electron transfer. Moreover, the partial formation of metal fluoride at the interface between the surface of LMFP and the layer of carbon coating doped with fluorine enhances the reduction in the charge-transfer resistance. The modified ferromanganese phosphate cathode material reveals an outstanding discharge capacity displaying a reversible discharge specific capacity value of 131.73 mA h g⁻¹ at 10C and 154.6 mA h g⁻¹ at 0.2C, due to its unique structure.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"92 ","pages":"Pages 278-287"},"PeriodicalIF":3.5,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141264089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}