Powder Technology最新文献

{"title":"Influence of dispersion gas flow on the spray characteristics and γ-Fe2O3 nanoparticles formation and properties in reference SpraySyn burners","authors":"Orlando Massopo ,&nbsp;Ricardo Tischendorf ,&nbsp;Munko Gonchikzhapov ,&nbsp;Tina Kasper ,&nbsp;Peter Augustin ,&nbsp;Burak Özer ,&nbsp;Manuel Reddemann ,&nbsp;Reinhold Kneer ,&nbsp;Mohammed-Ali Sheikh ,&nbsp;Aydan Akyildiz Mert ,&nbsp;Hartmut Wiggers ,&nbsp;Hans-Joachim Schmid","doi":"10.1016/j.powtec.2025.121992","DOIUrl":"10.1016/j.powtec.2025.121992","url":null,"abstract":"<div><div>This study investigates the effect of dispersion gas (DG) flow on the formation and properties of maghemite (γ-Fe₂O₃) nanoparticles using standardized <em>SpraySyn</em> burners (SS1 and SS2). Several diagnostics were employed to characterize the spray and nanoparticles.</div><div>Increasing DG flow (6<span><math><mo>−</mo></math></span>12 slm) results in smaller droplet sizes (DS), cooler flame temperatures, shorter high-temperature droplet/particle residence times, and smaller agglomerates in the size range of 5<span><math><mo>−</mo></math></span>12 nm with narrower primary particle size distribution, corresponding to higher mass fractal dimensions, as supported by <span>TEM</span> and SMPS analysis, resulting in more compact agglomerates. BET and TEM confirmed decreasing primary particle sizes with increasing DG flow. Raman and XRD analyses predominantly identified maghemite, which shows a bimodal distribution of crystallite sizes, while SS1 samples have a greater proportion of larger crystallites.</div><div>The self-preserving size distributions of agglomerates with a geometric standard deviation of 1.5 are reached faster with increasing DG flow. The barrier effect of DG observed in SS1 leads to slower droplet combustion kinetics, higher temperatures, and delayed precursor release, which, along with downstream flow recirculation, result in significantly higher agglomeration rates outside the visible flame. SS2 demonstrates improved atomization, more stable flames, and finer, uniform nanoparticles with less carbonaceous residues (CR). Conversely, SS1 showed broader DS distributions and higher CR levels on the γ-Fe₂O₃ surface, especially at higher DG flow.</div><div>This work highlights the essential role of DG flow and nozzle geometry in controlling droplet evaporation, flame stability, and nanoparticle growth, offering insights for optimizing SFS and validating numerical models.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 121992"},"PeriodicalIF":4.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682394","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}

{"title":"Emulsification-driven size control in supercritical PLGA-based encapsulation: from nanocapsules to microcapsules","authors":"Maria Chiara Iannaco,&nbsp;Stefania Mottola,&nbsp;Iolanda De Marco","doi":"10.1016/j.powtec.2025.122016","DOIUrl":"10.1016/j.powtec.2025.122016","url":null,"abstract":"<div><h3>Introduction</h3><div>Sustainable and adaptive technologies in drug delivery are essential in pharmaceutical engineering. This study explores supercritical emulsion extraction (SEE), a continuous and eco-efficient process that controls capsule morphology and enhances process efficiency.</div></div><div><h3>Methods</h3><div>We investigated the impact of sonication steps, polymer <em>co</em>ncentration, and polylactic-co-glycolic acid (PLGA) molecular weight on capsule size and distribution. Two PLGA grades were tested: Resomer® RG 752 S (low molecular weight) and Resomer® RG 504H (high molecular weight).</div></div><div><h3>Results</h3><div>Modifying the sonication protocol allowed control over particle size: single sonication produced microcapsules (400–600 nm), for sustained gastrointestinal delivery or injectable formulations, while double sonication yielded nanoscale carriers (130–250 nm) for intracellular targeting and trans-barrier transport. Bromelain, an enzyme derived from agro-industrial waste, was used as a model bioactive compound, demonstrating high encapsulation efficiency and retained activity. Capsule size significantly influenced the release profile: nanocapsules exhibited rapid, diffusion-driven release, whereas microcapsules followed a biphasic pattern, initially governed by diffusion and later by polymer degradation and erosion. These findings aligned with Korsmeyer–Peppas kinetic model.</div></div><div><h3>Conclusion</h3><div>SEE offers a versatile approach for producing tailored drug delivery platforms by adjusting internal processing steps, without altering system architecture. This method supports the development of greener, modular manufacturing pipelines for next-generation therapeutic systems.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 122016"},"PeriodicalIF":4.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682342","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}

{"title":"SAG mill design techniques and comprehensive design methodology","authors":"Tahir Jauhar ,&nbsp;Paul W. Cleary ,&nbsp;Craig Wheeler ,&nbsp;Michael Carr ,&nbsp;Dean Ellis ,&nbsp;Stephan Chalup","doi":"10.1016/j.powtec.2025.121998","DOIUrl":"10.1016/j.powtec.2025.121998","url":null,"abstract":"<div><div>This paper reviews design and analysis techniques for Semi-Autogenous Grinding (SAG) mills, categorizing key variables into constraints, controls, operating conditions, and preferred outcomes. Experimental and numerical approaches including Grinding Media Trajectory (GMT) models for impact predictions, Population Balance Models (PBM) for Particle Size Distributions (PSDs) evolution, and Discrete Element Method (DEM) for particle dynamics are reviewed and compared based on input requirements and insights for SAG modelling. A novel design methodology is proposed that combines GMT for particle impact energy estimation, PBM for optimizing mill length and grate size to enhance throughput, and DEM for detailed charge dynamics, incorporating bidirectional feedback loops: DEM-refined collision energies update PBM breakage rates, while PBM-predicted PSDs refine GMT trajectories. This integration improves energy spectra and utilization, achieving better product grind size under varying operational constraints. Applied to a 1.8 m diameter SAG mill belly, the methodology yields an optimized design with 12 lifters at a 22.5° face angle and 0.138 m height, minimizing media-to-lifter impacts and reducing wear. The iterative process advances internal mill mechanics and charge-lifter interactions, offering substantial improvements over standalone techniques through validated multiscale predictions.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 121998"},"PeriodicalIF":4.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682391","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}

{"title":"New insights into the role of positively charged CO2 nanobubbles in enhancing the flotation of cryptocrystalline graphite","authors":"Junchao Wang ,&nbsp;Kai Fan ,&nbsp;Lijun Deng ,&nbsp;Guosheng Li ,&nbsp;Yijun Cao","doi":"10.1016/j.powtec.2025.122010","DOIUrl":"10.1016/j.powtec.2025.122010","url":null,"abstract":"<div><div>An effective method for enhancing the flotation of cryptocrystalline graphite using positively charged CO₂ nanobubbles (NBs) based on electrostatic driving and NB bridging is proposed, targeting the difficult to float characteristics of cryptocrystalline graphite such as fine particle size, strong electronegativity, and low probability of bubble-particle collision and attachment. The effects of circulation time, gas flow rate and solution pH on the charging properties and size of CO₂ NBs were systematically investigated, and positively charged CO₂ NBs with an average size of approximately 280 nm and a zeta potential of about 13 mV were successfully prepared using a micro-nano bubble generator based on the circulating countercurrent and multiphase vortex gas-liquid shearing technology. Compared with the results of conventional flotation, introducing positively charged CO₂ NBs into the pulp could significantly improve the flotation efficiency of cryptocrystalline graphite. In addition, CO₂ NB flotation could also reduce the amount of kerosene by 58.3 % under the condition of similar separation indicators. The interaction mechanism of positively charged CO₂ NBs enhancing the flotation of cryptocrystalline graphite was elucidated through particle surface electrical properties analysis, flotation kinetics analysis, and particle agglomeration behavior analysis. It was found that positively charged CO₂ NBs mainly promoted particle agglomeration by weakening electrostatic repulsion and strengthening hydrophobic attraction, thereby increasing the apparent particle size and improving the collision efficiency between particles and macro-sized bubbles. Meanwhile, the attachment between particles and macro-sized bubbles was further strengthened based on NB bridging, thus improving the flotation efficiency of cryptocrystalline graphite. This research is of great significance to improve the flotation efficiency of cryptocrystalline graphite and facilitate the application of positively charged micro-nano bubble flotation technology in the field of fine mineral resource separation.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 122010"},"PeriodicalIF":4.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682341","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}

{"title":"Tailoring size and shape of silicon grinding media for optimized autogenous stirred media milling","authors":"Marcel Filipe Möller,&nbsp;Arno Kwade","doi":"10.1016/j.powtec.2025.121996","DOIUrl":"10.1016/j.powtec.2025.121996","url":null,"abstract":"<div><div>This study investigates the influence of mechanical pretreatment methods – screening, mixing, and spheroidizing - on the performance of autogenous silicon grinding media (aGM) in stirred media milling. Screening resulted in steeper particle size distributions (PSD) and increased bulk porosity, but did not significantly affect wear rate or energy consumption. Mixing different aGM sizes broadened PSD and reduced porosity, particularly in bimodal mixtures, leading to notably lower wear rates during abrasion-dominated wear phases, though without being beneficial for the energy efficiency. Spheroidization, achieved during autogenous milling, increased sphericity and reduced bulk porosity at rest, leading to reduced wear rate by abrasion and a slight improvement in energy efficiency, especially at coarser particle sizes. High-resolution particle size analysis confirmed that the PSD generated with aGM are comparable to those achieved using conventional ZrO₂ media. These findings highlight spheroidized aGM as a promising, low-contamination alternative to traditional grinding media.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 121996"},"PeriodicalIF":4.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733752","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}

{"title":"Reshaping particle entrainment dynamics in single-source airborne sound fields","authors":"Pengzhan Liu ,&nbsp;Duojia Shi ,&nbsp;Morgan WeiZhi Tan ,&nbsp;Ming Li ,&nbsp;Xin Zhang ,&nbsp;Guicai Liu ,&nbsp;Shi Hao Lim ,&nbsp;Hang Yin ,&nbsp;Man Pun Wan ,&nbsp;Grzegorz Lisak ,&nbsp;Bing Feng Ng","doi":"10.1016/j.powtec.2025.122015","DOIUrl":"10.1016/j.powtec.2025.122015","url":null,"abstract":"<div><div>As a promising aerosol processing technology for air sustainability, acoustic agglomeration (AA) primarily leverages the oscillating air medium to entrain aerosol particles by different extents, thereby inducing particle collision and agglomeration. This effect is commonly known as the orthokinetic effect, where the particle entrainment dynamics is typically resolved through the analytical expressions, which however, are still unable to predict experimental observations accurately. Here, we physically establish and numerically resolve an acoustic-thermoviscous acoustic-particle (ATAP) coupling model for the particle entrainment dynamics under single-source airborne sound waves. We find that the thermoviscous interaction around the air-particle interface can significantly lead to reshaping of particle entrainment dynamic behaviors as compared to the classical analytical solutions, including shrinking of entrainment coefficient and shift of entrainment phase difference. Through our ATAP coupling model, we investigate the dependency of particle entrainment dynamics on multiple parameters and compare them with the two classical analytical solutions. More importantly, we propose a hybrid analytical-numerical (HAN) approach to mathematically calibrate classical solutions for accurate results, the feasibility of which is verified by comparisons against simulation results in sound fields of different waveforms. Our results present an innovative insight of particle entrainment dynamics under single-source airborne acoustic waves, which can be extensively harnessed for accurate derivation of orthokinetic kernels for population balance modeling of AA.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 122015"},"PeriodicalIF":4.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733748","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}

{"title":"The stabilizing effect and mechanism of nano-silica on bubbles in cemented paste backfill","authors":"Liuhua Yang ,&nbsp;Pengyao Zhao ,&nbsp;Zhenhua Li ,&nbsp;Huazhe jiao ,&nbsp;Peng Li ,&nbsp;Qiusong Chen ,&nbsp;Yu Zheng","doi":"10.1016/j.powtec.2025.122005","DOIUrl":"10.1016/j.powtec.2025.122005","url":null,"abstract":"<div><div>Tailings utilization and the creation of high-performance backfill materials remain significant challenges. To tackle these, this study developed a stable bubble system by synergistically combining nano-silica with an air-entrainment agent (TTAB). The influence of varying nano-silica content (0–25 g) on bubble stability and the resulting backfill properties was systematically investigated. Theoretical analysis, drawing on the Young-Laplace and Stefan-Reynolds equations to interpret capillary pressure differences, revealed that nano-silica nanoparticles create bridging structures that impede liquid drainage. SEM-EDS analysis confirmed this mechanism, establishing a direct link between the material's microstructural evolution and its macroscopic mechanical behavior. Results show that nano-silica forms robust interfacial networks within bubble liquid films, markedly enhancing stability. At 25 g of nano-silica, the 1-h settling distance and drainage height plummeted by 85.9 % and 28.6 %, respectively. This dosage also refined the pore structure, with over 60 % of pores measuring below 200 μm and an 84.6 % reduction in density variation. Notably, an optimal nano-silica dosage of 15 g delivered the best overall performance, achieving a balance between peak flowability (12.75 cm spread diameter) and the highest 28-day compressive strength (2.24 MPa, a 21.1 % increase). This enhancement stems from improved bubble uniformity and the pozzolanic reaction that generates additional C-S-H gel. However, excessive nano-silica (&gt;15 g) led to particle agglomeration, undermining performance. This study offers an innovative strategy for enhancing the stability and strength of tailings-based backfill materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 122005"},"PeriodicalIF":4.6,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733749","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}

{"title":"Morphology-preserving remeshing approach to particulate microstructures via harmonic decomposition","authors":"Mahmoud Shaqfa","doi":"10.1016/j.powtec.2025.121991","DOIUrl":"10.1016/j.powtec.2025.121991","url":null,"abstract":"<div><div>Harmonic decomposition of surfaces, such as spherical and spheroidal harmonics, is used to analyze morphology, reconstruct, and generate surface inclusions of particulate microstructures. However, obtaining high-quality meshes of engineering microstructures using these approaches remains an open question. In harmonic approaches, we usually reconstruct surfaces by evaluating the harmonic bases on equidistantly sampled simplicial complexes of the base domains (e.g., triangulated spheroids and disks). However, this traditional sampling does not account for local changes in the basis-function Jacobian, leading to nonuniform discretization after reconstruction or generation. As it impacts the accuracy and time step, high-quality discretization of microstructures is crucial for efficient numerical simulations (e.g., finite element and discrete element methods, contact detection, and computation of contact forces). To circumvent this issue, we propose an efficient hierarchical diffusion-based algorithm for resampling surfaces, i.e., performing a reparameterization, to yield an equalized mesh triangulation. Analogous to heat problems, we use nonlinear diffusion to resample the curvilinear coordinates of the analysis domain, thereby enlarging small triangles at the expense of large triangles on surfaces. We tested isotropic and anisotropic diffusion schemes on the recent spheroidal and hemispheroidal harmonics methods. The results show a substantial improvement in the quality metrics for surface triangulation. Unlike traditional surface reconstruction and meshing techniques, this approach preserves surface morphology, along with the areas and volumes of surfaces. We discuss the results and the associated computational costs for large 2D and 3D microstructures, such as digital twins of concrete and stone masonry, and their future applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 121991"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682339","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}

{"title":"Reaction molecular dynamics simulation of pressurized co-pyrolysis of waste plastic and coal: Synergistic mechanism analysis","authors":"Guanwen Zhou ,&nbsp;Yifei Zhou ,&nbsp;Kang Du","doi":"10.1016/j.powtec.2025.121980","DOIUrl":"10.1016/j.powtec.2025.121980","url":null,"abstract":"<div><div>The graded and quality-based utilization of low-rank coal via pyrolysis is a promising approach for achieving clean and efficient conversion of coal-based resources, with tar being a key high-value product. Waste plastics, with their high H/C atom ratio, can serve as excellent hydrogen donors, and co-pyrolysis with coal can significantly enhance both tar yield and quality. In this study, reaction molecular dynamics simulations (ReaxFF-MD) were conducted on the pressurized <em>co</em>-pyrolysis process of polypropylene (PP), coal, and mixed systems. The effects of pressure on carbon component distribution and tar quality were investigated. The evolution of typical hydrogen-containing radicals and their contributions to tar formation and the generation mechanisms of major pyrolysis products were analyzed. The results show that light tar content generally increases with pressure, reaching a peak at 0.2 MPa. Based on their contribution to oil formation reactions, the contribution of hydrogen radicals to tar formation was ranked as follows: ∙H &gt; ∙CH₃ &gt; ∙CH₂ &gt; ∙CHO, with most hydrogen radicals originating from PP pyrolysis, indicating that the synergistic effect of PP can effectively enhance tar yield and quality. PP pyrolysis begins with C<img>C bond cleavage, while coal pyrolysis starts with C<img>O bond cleavage. Synergistic tar primarily originates from the decomposition of functional groups in coal, breakage of long-chain PP molecules, combination of active free radicals, and depolymerization and polymerization of primary tar. This study provides a theoretical basis for enhancing tar yield and quality through pressurized co-pyrolysis and lays the foundation for developing more accurate co-pyrolysis models.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 121980"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682395","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}

{"title":"DEM-CFD simulation and optimization of an air-assisted seed guide tubes with guided-groove for high-speed maize delta-row dense-plantings planter","authors":"Wensheng Sun ,&nbsp;Shujuan Yi ,&nbsp;Hailong Qi ,&nbsp;Yifei Li ,&nbsp;Yupeng Zhang ,&nbsp;Jiasha Yuan ,&nbsp;Song Wang","doi":"10.1016/j.powtec.2025.121942","DOIUrl":"10.1016/j.powtec.2025.121942","url":null,"abstract":"&lt;div&gt;&lt;div&gt;During high-speed operation of the maize delta-row dense-planting planter, seeds in the seed guide tubes are unstable due to the restriction of airflow, and are easy to collide with the tube wall violently, so that it is difficult to maintain the single-seed state, resulting in poor uniformity and consistency during two tubes alternating seed-throwing and adversely affecting the delta-row seeding quality. To solve this problem, based on the brachistochrone theory considering the friction force, an air-assisted seed guide tubes with guided-groove was improved. The migration mechanism of seed in the seed-guiding device was analysed theoretically. The movement process of the qualified delta-row group seeds in the seed-guiding device was simulated by using the coupled simulation method of discrete element method and computational fluid dynamics (DEM-CFD), and the movement law of seeds in the seed guide tubes was explored under the conditions of different types of seeds, chamber pressure and operating speeds combined with single-factor experiment. The characteristics of the flow field in the tubes were analysed. The simulation test results show that the variation of the falling displacement of seeds in the device with time is a power function; the seeding performance of small-flat (SF) seeds in the tubes is the best; the dynamic response of the two tubes of the device with the change of chamber pressure is consistent, and no discernible differential impact on seed movement. Through high-speed camera technology and bench testing, the reliability of simulation results, the feasibility of “ zero-speed of seed-throwing “, and the performance superiority of the optimized seed guide tube (Type C) were verified. The results showed that the delta-row qualified index (DRQI) and the qualified coefficient of variation of projected spacing (QCVPS) of the type C tubes were better than those of the other two tubes under different operating speeds and chamber pressures, which indicated that the method of “ airflow assistance + guided-groove structure + brachistochrone “ could more effectively restrict the migration process of seeds in the tubes, enhancing seed-guiding stability and uniformity. Through orthogonal experimental design, primary and secondary factors influencing the tubes performance and their significant levels were identified. The optimal parameter combination was determined as chamber pressure 4.2 kPa and operating speed 12 km/h, under this combination, yielding the DRQI of 97.33 % and the QCVPS of 5.94 %. A field experiment was conducted to test the delta-row seeding quality of the tubes under the condition of high-speed operation. At operating speeds of 12–16 km/h, the type C tubes achieved the DRQI ≥80.95 %, the row spacing qualified index (RSQI) ≥ 88.89 %, the QCVPS ≤11.36 %, and the qualified coefficient of variation of row spacing (QCVRS) ≤ 6.43 %, thereby meeting the high-speed seeding quality requirements for the maize delta-row dens","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"470 ","pages":"Article 121942"},"PeriodicalIF":4.6,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682340","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}