Powder Technology最新文献_第3页

Characterization of wood powder properties: A DEM-based calibration with rotating drum experiments 木粉特性表征：基于dem的旋转滚筒实验校准

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-21 DOI: 10.1016/j.powtec.2026.122157

Reem Khazem , Julien Colin , Hao Shi , Joel Casalinho , Dingena Schott , François Puel

Powder flowability underlies reliable solids handling, influencing dosing accuracy and production stability. Wood powders are usually cohesive and susceptible to flow problems like bridging because of their irregular, fibrous particles that are hygroscopic and heterogeneous. Two lignocellulosic powders were tested: spruce (softwood) and poplar (hardwood). Their particle size distribution, particle shape, and density were measured experimentally. Crucially, the interparticle parameters that govern powder bulk behavior, which are the cohesion energy density (

CED

), rolling friction coefficient (

μᵣ

), and sliding friction coefficient (

μₛ

), are not directly measurable at the scale and morphological complexity of fibrous wood particles. Therefore, using the Discrete Element Method (DEM), (

μₛ, μᵣ

,

CED

) were identified as effective DEM parameters by inverse calibration against rotating drum tests. A novel calibration workflow was developed to compare DEM simulations with real rotating drum experiment indicators, which can be used for unconfined, dynamic flow. These indicators correspond to newly discovered macroscopic flow descriptors that are processed from the powder bed: average projected area

\bar{Area}

, its fluctuation

σ (Area)

, and the average surface profile irregularity

\bar{r^{2}}

. Wood particles were modeled as multi-sphere clumps with different sizes to balance realism and computational cost. The calibrated parameters were: spruce—

μ_{s}

=0.10,

μ_{r}

=0.367,

CED

=130 kJ/m³; poplar—

μ_{s}

=0.10,

μ_{r}

=0.772,

CED

=100 kJ/m³. Following a comprehensive results analysis, increasing CED and friction parameters deteriorates powder unconfined flowability by promoting agglomeration and particle interlocking. The resulting calibrated DEM inputs provide a baseline for predicting and improving the handling of wood powders in hoppers, feeders, and conveying screws.

粉末流动性是可靠固体处理的基础，影响计量精度和生产稳定性。木粉通常具有凝聚力，容易出现桥接等流动问题，因为它们的不规则纤维颗粒具有吸湿性和异质性。测试了两种木质纤维素粉末：云杉（软木）和杨树（硬木）。实验测量了它们的粒径分布、颗粒形状和密度。至关重要的是，控制粉末体积行为的颗粒间参数，即聚能密度（CED）、滚动摩擦系数（μᵣ）和滑动摩擦系数（μₛ），不能直接测量纤维木颗粒的尺度和形态复杂性。因此，采用离散元法（DEM），（μₛ，μᵣ，CED）是有效的DEM参数。开发了一种新的校准工作流程，将DEM模拟与实际旋转鼓实验指标进行比较，可用于无约束动态流动。这些指标对应于新发现的从粉床上加工出来的宏观流动描述符：平均投影面积area¯，其波动σArea，平均表面轮廓不规则度r2¯。木材颗粒被建模成不同大小的多球团块，以平衡真实感和计算成本。标定参数为：云杉-μs =0.10, μr=0.367， CED=130 kJ/m3；μs=0.10, μr=0.772， CED=100 kJ/m3。综合结果分析，增大CED和摩擦参数会通过促进团聚和颗粒联锁而恶化粉末的无侧限流动性。由此校准的DEM输入为预测和改善料斗、给料器和输送螺钉中木粉的处理提供了基线。

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引用次数: 0

The utilization of waste cheese whey for retardation in alkali activated slag-based materials: Retarding performance and molecular hydration mechanism 废干酪乳清在碱活性渣基材料中的缓凝利用：缓凝性能及分子水化机理

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-21 DOI: 10.1016/j.powtec.2026.122161

Shuang Hu , Jiaqing Wang , Xin Zhou , Qiang Li , Dongzhao Jin , Dongdong Ge , Feng Shen

The strong early-stage reaction and short initial setting time characteristic of alkali activated slag hinders its potential for widespread field application, thus necessitating the use of retarders to prolong the setting time. However, conventional chemical retarders are generally characterized by high energy consumption and substantial carbon emissions. This study utilized waste cheese whey, biomass waste that causes resource depletion and environmental pollution, to prepare sodium galactonate (SGA) as a bio-retarder through a process involving biological fermentation and electrodialysis. The impact of SGA on the setting time, flowability, mechanical strength, and drying shrinkage of alkali activated slag (AAS) mixtures was assessed and compared with the commonly used sodium gluconate (SG) retarder. Results demonstrated that SGA effectively prolonged the setting time and enhanced the flowability, with effects becoming more pronounced as the dosage rose. SGA enhanced the setting time and maximum flowability by up to 120% and 32%, respectively. SEM-EDS, XRD, hydration heat test were conducted to investigate the effects of SGA on hydration products and microstructure. Meanwhile, SAXS test was used to investigate the impact of SGA incorporation on C-A-S-H gel agglomerations and the pore structure. Furthermore, in order to elucidate SGA's effect on the formation of silicate gels, XPS analysis of O 1 s, Al 2p, and Si 2p was performed. This study achieved a valorization of waste biomass resources with promoting the implementation of alkali activated materials in engineering applications.

碱活性渣早期反应强、初凝时间短的特点阻碍了其在现场的广泛应用，因此需要使用缓凝剂来延长其凝结时间。然而，传统的化学缓凝剂通常具有高能耗和大量碳排放的特点。本研究利用造成资源枯竭和环境污染的生物质废弃物奶酪乳清，通过生物发酵和电渗析工艺制备半胱胺酸钠（SGA）作为生物缓凝剂。考察了SGA对碱活性渣（AAS）混合料凝结时间、流动性、机械强度和干燥收缩率的影响，并与常用的葡萄糖酸钠（SG）缓凝剂进行了比较。结果表明，SGA能有效延长凝固时间，提高流动性，且效果随着用量的增加而明显。SGA将凝固时间和最大流动性分别提高了120%和32%。通过SEM-EDS、XRD、水化热测试研究了SGA对水化产物及微观结构的影响。同时，采用SAXS试验考察SGA掺入对C-A-S-H凝胶团聚和孔隙结构的影响。此外，为了阐明SGA对硅酸盐凝胶形成的影响，对O - 1s、Al - 2p和Si - 2p进行了XPS分析。本研究实现了废生物质资源的价值增值，促进了碱活性材料在工程应用中的实现。

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引用次数: 0

Morphological characterisation of particulate emissions from various welding techniques used in industrial environments 工业环境中使用的各种焊接技术产生的颗粒排放物的形态特征

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-19 DOI: 10.1016/j.powtec.2026.122156

Rubal Dhiman , Abhishek Singh , Adarsh Prakash , Akshat Jain , Sachin D. Kore , Anirudha Ambekar , Thaseem Thajudeen

Particulates emitted from industrial welding are a major occupational concern, as their size and morphology strongly influence exposure–response relationships and associated adverse health effects. We systematically characterise the effective density, monomer number (N_p), primary particle size (a_p), shape factor (χ), and fractal dimension (D_f) of particulates emitted from shielded metal arc welding (SMAW) and wire arc additive manufacturing (WAAM) under varying operating parameters using field-emission scanning electron microscopy (FE-SEM). A hybrid image analysis approach integrating optimisation techniques with FracVAL was used to reconstruct three-dimensional aggregate structures from two-dimensional FE-SEM images of welding particulates, for detailed morphological evaluation. The FE-SEM images from two welding techniques at different operating parameters revealed the presence of both spherical particles and fractal aggregates. WAAM mainly produced bare-like particles, whereas SMAW generated both bare and partially coated particles due to differences in operating principles. As particle mobility diameter increased during welding, the N_p (10−220) and χ (1.5–1.8) increased, while effective density (5000–1000 kg/m³) decreased. During SMAW, higher welding current and sampling height increased D_f (1.25–2.12) and polydispersity index (1.3–1.6), indicating progressively more compact particle structures. SMAW produced more compact aggregates (D_f: 1.25–2.15) than WAAM (D_f: 1.36–1.74). Morphological analysis indicates diffusion-controlled aggregation, with a mean D_f value of ∼1.6, consistent with diffusion-limited cluster aggregation (DLCA) behaviour. These results provide crucial insights into how specific welding techniques influence particulate structure, underscoring the need to include the effect of particle shape as well in exposure studies and in tailoring control measures.

工业焊接排放的微粒是一个主要的职业问题，因为它们的大小和形态强烈影响接触-反应关系和相关的不利健康影响。我们使用场发射扫描电子显微镜（FE-SEM）系统地表征了不同操作参数下屏蔽金属弧焊（SMAW）和丝弧增材制造（WAAM）发射的颗粒的有效密度、单体数（Np）、初级粒径（ap）、形状因子（χ）和分形维数（Df）。采用一种结合优化技术和分形法的混合图像分析方法，从焊接颗粒的二维FE-SEM图像中重建三维集合体结构，以进行详细的形态学评估。两种焊接工艺在不同操作参数下的FE-SEM图像均显示球形颗粒和分形聚集体的存在。WAAM主要产生裸状颗粒，而SMAW由于工作原理不同，产生裸状颗粒和部分包覆颗粒。随着焊接过程中颗粒迁移率直径的增大，Np（10 ~ 220）和χ(1.5 ~ 1.8)增大，有效密度（5000 ~ 1000 kg/m3）减小。在SMAW过程中，较高的焊接电流和取样高度增加了Df（1.25-2.12）和多分散性指数（1.3-1.6），表明颗粒结构逐渐致密化。SMAW比WAAM （Df: 1.36-1.74）产生更致密的聚集体（Df: 1.25-2.15）。形态学分析表明扩散控制聚集，平均Df值为~ 1.6，与扩散限制簇聚集（DLCA）行为一致。这些结果为特定焊接技术如何影响颗粒结构提供了重要见解，强调了在暴露研究和定制控制措施中包括颗粒形状影响的必要性。

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引用次数: 0

An experimental investigation into the rheology of fine powders for modelling fluidised dense-phase pneumatic conveying 细粉流化密相气力输送的流变学实验研究

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-19 DOI: 10.1016/j.powtec.2026.122159

Bheeni Bhatt , S.S. Mallick , Kapil Sharma , Gautam Setia , Anu Mittal

Fluidised dense-phase pneumatic conveying systems are increasingly used in industry to transport fine powders efficiently and with minimal environmental impact. However, accurate modelling and design remain challenging due to the complex behaviour of fluidised dunes. Accurate prediction of key parameters, including minimum transport limits and the influence of particle size distribution, requires understanding powder rheology. This study investigates the rheology of six fine powders, including fly ash and cement (

d_{50}

: 19-139 μm;

ρ_{s}

: 1950-2910 kg/m³;

ρ_{bl}

: 660-1080 kg/m³). An experimental facility was developed to determine yield stress under fluidized and unfluidized conditions, using three immersion depths and three spindle rotational speeds. Results showed that fluidization significantly reduced yield stress. In the unfluidized state, yield stress increased with particle size, with greater values at higher immersion depths but lower values at higher spindle speeds. Froude numbers were calculated for minimum transport boundary points from pipeline conveying characteristics of fly ash and cement in two pipelines (65 mm I.D × 254 m; 80/100 mm I.D × 407 m). These values were correlated with yield stress at standard test conditions, revealing that higher yield stress corresponded to greater Froude number requirements for transport. A new model was developed to predict the pipeline pressure drop (during pneumatic conveying of powders) using powder yield stress. The model has been validated by using it to predict the pipeline pressure drop for higher tonnages by comparing the experimental values of pressure drops versus predicted values. Results have shown the new model could predict pressure drop quite accurately.

流化密相气动输送系统越来越多地应用于工业中，以有效地输送细粉末，并以最小的环境影响。然而，由于流化沙丘的复杂行为，精确的建模和设计仍然具有挑战性。准确预测关键参数，包括最小输运限制和粒度分布的影响，需要了解粉末流变学。研究了粉煤灰、水泥等6种细粉（d50: 19 ~ 139 μm; ρs: 1950 ~ 2910 kg/m3; ρbl: 660 ~ 1080 kg/m3）的流变学特性。在三种浸没深度和三种主轴转速下，建立了一套测定流化和非流化条件下屈服应力的实验装置。结果表明，流态化显著降低了屈服应力。在非流化状态下，屈服应力随颗粒尺寸的增大而增大，浸泡深度越深，屈服应力越大，主轴转速越高，屈服应力越小。根据两条管道（65 mm I.D × 254 m; 80/100 mm I.D × 407 m）中粉煤灰和水泥的管道输送特性，计算最小输送边界点的弗劳德数。这些值与标准测试条件下的屈服应力相关，表明更高的屈服应力对应于更高的运输弗劳德数要求。建立了一种利用粉末屈服应力预测粉体气力输送过程中管道压降的新模型。通过对比压降的实验值和预测值，验证了该模型对高吨位管道压降的预测效果。结果表明，新模型能较准确地预测压降。

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引用次数: 0

A review of ash deposition modeling and anti-deposition structures 灰沉积模型与反沉积构造研究进展

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-19 DOI: 10.1016/j.powtec.2026.122160

Xiaobing Zhang , Ran An

Ash deposition is an urgent problem that deteriorates heat transfer efficiency and reduces the operational safety of equipment. This paper provides a comprehensive review of the development of ash deposition modeling, including the deposition mechanisms, particle adhesion criteria, heat transfer modeling, and the evolution of deposition layer morphology. In addition, the deposition suppression models are elaborated and analyzed for the most common tube bundle structures in heat exchange equipment, emphasizing the effectiveness of each model in improving the anti-deposition performance under applicable conditions. As an auxiliary means of experimentation, numerous attempts have been made to develop numerical models suitable for various conditions to enhance simulation accuracy. Some primary deposition mechanisms have been proposed and applied to predict particle transport behavior, showing unique deposition mechanisms for particles with different properties. As a key component of dynamic comprehensive deposition models, a series of sub-models describing particle deposition behavior and heat transfer mechanisms have been developed. The main focus on deposition layer parameters includes porosity, effective thermal conductivity, and surface emissivity, all dependent on deposit layer characteristics, with various models proposed for solving these. Finally, this paper summarizes the development of deposition modeling, identifies current challenges, and offers suggestions for future research in deposition. This paper aims to provide a valuable modeling review and reference for research in the deposition field, aiding in a deeper understanding of deposition mechanisms and the refinement of anti-deposition strategies.

灰积是影响设备换热效率、降低设备运行安全性的紧迫问题。本文综述了灰沉积模型的发展，包括沉积机制、颗粒粘附标准、传热模型和沉积层形貌的演变。此外，对换热设备中最常见的管束结构的抑制沉积模型进行了阐述和分析，强调了每种模型在适用条件下提高抗沉积性能的有效性。作为实验的辅助手段，为了提高模拟精度，人们进行了许多尝试，开发适合各种条件的数值模型。一些原始沉积机制被提出并应用于预测颗粒的输运行为，显示出不同性质颗粒的独特沉积机制。作为动态综合沉积模型的关键组成部分，一系列描述颗粒沉积行为和传热机理的子模型已经被开发出来。主要关注沉积层参数包括孔隙度、有效导热系数和表面发射率，这些参数都取决于沉积层的特征，并提出了各种模型来求解这些参数。最后，对沉积建模的发展进行了总结，指出了当前面临的挑战，并对今后的沉积研究提出了建议。本文旨在为沉积领域的研究提供有价值的建模综述和参考，有助于更深入地了解沉积机制和完善反沉积策略。

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引用次数: 0

Hydration behavior, microstructural evolution, and mechanical performance of tailings-based solid waste cemented backfill under high-temperature conditions 高温条件下尾砂基固体废物胶结充填体水化行为、微观结构演化及力学性能

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-19 DOI: 10.1016/j.powtec.2026.122155

Chao Zhang , Weidong Song , Jinping Guo , Yuan Wang , Xiaolin Wang , Xiangyang Li

Deep underground mining operations are frequently characterized by high-temperature environments, which pose significant challenges to stope stability and the performance of backfill structures. To promote the sustainable utilization of solid waste, this study systematically investigated the hydration behavior, microstructural evolution, and mechanical performance of tailings-based cemented backfill under elevated temperature conditions. Experimental tests were conducted to quantify the effects of curing temperature on compressive strength and hydration heat evolution. Furthermore, the Krstulovic–Dabic kinetic model and CEMHYD3D numerical simulation were integrated to elucidate the hydration kinetics and the underlying micro-mechanisms. The results show that the compressive strength of the backfill exhibits an “increase–decrease” trend with rising temperature, with an optimal curing temperature around 40 °C. The hydration kinetics analysis reveals that the process follows a typical three-stage evolution pattern: Nucleation and Crystal Growth (NG), Phase Boundary Interactions (I), and Diffusion (D). Among these, the I-stage (Phase Boundary Interactions) plays a critical role in product formation and structural densification. Microstructural observations indicate that elevated temperatures accelerate early hydration reactions, but excessive heat (>40 °C) leads to non-uniform product distribution, increased porosity, and microcrack formation. The fractal dimension of pores is negatively correlated with mechanical parameters, confirming that structural compactness is a key factor controlling strength development. These findings elucidate the thermo-hydration coupling mechanism of tailings-based backfill under high temperatures and provide actionable theoretical support for optimizing curing protocols and mix designs for green backfilling and efficient solid waste utilization in deep mining environments.

深埋地下采矿作业经常面临高温环境，这对采场稳定性和充填体结构性能提出了重大挑战。为了促进固体废物的可持续利用，本研究系统研究了高温条件下尾砂基胶结充填体的水化行为、微观结构演变和力学性能。通过试验研究了养护温度对混凝土抗压强度和水化热演化的影响。结合Krstulovic-Dabic动力学模型和CEMHYD3D数值模拟，阐明了水化动力学及其微观机制。结果表明：充填体抗压强度随温度升高呈“增减”趋势，最佳养护温度在40℃左右；水化动力学分析表明，该过程遵循典型的三阶段演化模式：成核和晶体生长（NG）、相界相互作用(I)和扩散(D)。其中，i阶段（相边界相互作用）在产物形成和结构致密化中起着关键作用。显微结构观察表明，高温加速了早期水化反应，但过热（40°C）导致产物分布不均匀，孔隙率增加，微裂纹形成。孔隙分形维数与力学参数呈负相关，说明结构密实度是控制强度发展的关键因素。研究结果阐明了高温条件下尾砂充填体的热-水化耦合机理，为深部采矿环境下绿色充填体的养护方案和配合比优化及固废高效利用提供了可行的理论支持。

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引用次数: 0

Numerical simulation study on particle migration and clogging behavior in typical pore-throat structures based on the resolved CFD-DEM method 基于解析CFD-DEM方法的典型孔喉结构中颗粒迁移与堵塞行为数值模拟研究

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-16 DOI: 10.1016/j.powtec.2026.122154

Zheng Yu , Baolei Liu , Liang Zhao , Cunyou Zou

Particle migration and clogging in porous media significantly impact reservoir development and groundwater remediation. However, systematic comparisons of typical pore-throat structures and their influence on particle dynamics remain insufficient. This study employs a fully resolved CFD-DEM-IBM framework integrated with dynamic mesh refinement to simulate particle transport and clogging in three representative pore-throat geometries: constricted, bifurcated, and large-pore throats. Results show that, in constricted pore throat, the propensity for clogging is primarily governed by the particle-to-throat size ratio and the hydrodynamic conditions, with a clear transition observed from free migration to intermittent and finally stable clogging as particle size increases. For bifurcated pore throat, clogging in the narrower branch induces significant flow redistribution and markedly alters the local pressure field. Within large pore throat, particle accumulation leads to complex internal flow patterning and can ultimately result in throat clogging. The proposed model accurately captures clogging dynamics and provides a reference for predicting particle migration and clogging behavior in complex porous media.

多孔介质中的颗粒迁移和堵塞对储层发育和地下水修复具有重要影响。然而，系统比较典型的孔喉结构及其对颗粒动力学的影响仍然不足。本研究采用完全解析的CFD-DEM-IBM框架，结合动态网格细化，模拟三种代表性孔喉几何形状（收缩孔喉、分叉孔喉和大孔喉）中的颗粒传输和堵塞。结果表明，在收缩孔喉中，堵塞倾向主要受颗粒与喉道尺寸比和水动力条件的影响，随着颗粒尺寸的增加，从自由迁移到间歇性堵塞，最后是稳定堵塞的明显转变。对于分叉孔喉，较窄分支的堵塞会引起明显的流动再分布，并显著改变局部压力场。在大孔喉内，颗粒积聚导致复杂的内部流动模式，最终导致孔喉堵塞。该模型准确地捕捉了堵塞动态，为预测复杂多孔介质中的颗粒迁移和堵塞行为提供了参考。

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引用次数: 0

Refined segmentation of synchrotron XCT-based characterization of metal powders under different noise conditions 基于同步加速器xct的金属粉末在不同噪声条件下精细分割

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-16 DOI: 10.1016/j.powtec.2026.122153

Ananthakrishna Sajithkumar , Yunhui Chen , Jordi Pijuan , Benedicta Arhatari , Andrew Stevenson , Maria Niubó , Mark Easton

The characterization of metal powders is crucial for assessing their suitability in additive manufacturing applications. Synchrotron X-ray computed tomography provides high-resolution, three-dimensional data for evaluating particle morphology and internal porosity. However, accurate interpretation of such datasets, particularly for metallic powders, remains challenging due to reconstruction artifacts and segmentation sensitivity. This study presents an optimized post-reconstruction segmentation framework using marker-controlled watershed implemented using Fiji, aimed at improving robustness and reproducibility in synchrotron-based powder analysis. Aluminum alloy powders sieved to less than 150 μm and less than 100 μm were analyzed to investigate the influence of image quality, filtering, and marker definition on segmentation outcomes. The finer powder sample, affected by noise voxels, required a two-step adaptive filtering strategy and careful tuning of the contrast threshold based on the distance map, using the h-parameter in the extended maxima function. In contrast, the coarser sample, exhibiting minimal noise, showed stable segmentation performance across a broader range of threshold values. Morphological metrics such as Feret diameter and Equivalent Spherical Diameter were employed to evaluate the accuracy of segmentation and particle shape. Results indicate that dataset-specific preprocessing and distance-driven marker definition are essential for minimizing under- and over-segmentation in noise-affected data. The proposed framework enhances the reliability of synchrotron X-ray computed tomography-based powder analysis, supporting its use in quality control of feedstock materials for additive manufacturing.

金属粉末的表征对于评估其在增材制造应用中的适用性至关重要。同步加速器x射线计算机断层扫描为评估颗粒形态和内部孔隙度提供了高分辨率的三维数据。然而，由于重建工件和分割敏感性，对这些数据集的准确解释，特别是对金属粉末的数据集，仍然具有挑战性。本研究提出了一个优化的重建后分割框架，使用斐济实施的标记控制分水岭，旨在提高基于同步加速器的粉末分析的稳健性和可重复性。分析了筛选到小于150 μm和小于100 μm的铝合金粉末，研究了图像质量、滤波和标记定义对分割结果的影响。对于受噪声体素影响的细粉样品，需要采用两步自适应滤波策略，并使用扩展极大值函数中的h参数，根据距离图仔细调整对比度阈值。相比之下，粗糙的样本表现出最小的噪声，在更大的阈值范围内表现出稳定的分割性能。形态学指标如Feret直径和等效球面直径用于评估分割的准确性和颗粒形状。结果表明，数据集特定的预处理和距离驱动的标记定义对于最小化受噪声影响的数据的过分割和欠分割至关重要。提出的框架增强了同步加速器x射线计算机层析成像粉末分析的可靠性，支持其在增材制造原料质量控制中的应用。

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引用次数: 0

Discrete element method reveals flow mechanism and lateral pressure characteristics of grain storage in sector-shaped silos 离散元法揭示了扇形筒仓储粮的流动机理和侧压特性

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-16 DOI: 10.1016/j.powtec.2026.122126

Haiyan Liu , Hongbo Qu , Xuefei Lu , Jinyong Guo , Xianmei He , Ying Li , Xiaoxuan Fan , Xiangnan Xu

To achieve classified, quality-based grain storage, the grain industry has proposed a novel silo design incorporating partition walls within traditional circular silos. After adding these partitions, the silo cross-section transforms from circular to sector-shaped, resulting in distinct discharging flow patterns and lateral pressure characteristics compared to conventional center-discharge silos. This study established a 1000 mm-high, 250 mm-radius sector silo model via SolidWorks. Using soybeans as stored material, three parallel filling and discharging simulations were conducted with EDEM. Methods such as stratified dyeing and force chain analysis were employed to investigate flow patterns and lateral pressure distribution. Results show that during static storage, force chain strength in the lower silo section was about 1.8 times that of the upper section, while angle-constrained regions exhibit roughly 1.2 times the strength of unconstrained areas. This results in peak static lateral pressures concentrating in the middle-lower portion of the silo, with higher peaks near the angle-constrained zones. Discharge flow evolves through three stages: “mass flow–mixed flow–funnel flow,” with a “lower inside, higher outside” height profile influenced by angular constraints. Force chains cyclically form and collapse during discharge. About 70% of measurement points showed peak dynamic pressure during mass flow, with maxima concentrated near the flow transition depth. The average dynamic pressure at 94% of points exceeded GB50077-2017 code values, highlighting code limitations for multi-compartment silos. Overpressure occurred at all points, more severely in middle-upper sections. Modified lateral pressure formulas are provided, offering a theoretical reference for sector silo design.

为了实现分类、质量为基础的粮食储存，粮食行业提出了一种新的筒仓设计，在传统的圆形筒仓内结合隔墙。在增加这些隔板后，筒仓的横截面从圆形变为扇形，与传统的中心卸料筒仓相比，产生了不同的卸料流动模式和侧压力特性。本研究通过SolidWorks建立了一个1000 mm高、250 mm半径的扇形筒仓模型。以大豆为储料，利用EDEM进行了3次平行充放模拟。采用分层染色和力链分析等方法研究了血流模式和侧压力分布。结果表明：在静力储存过程中，下仓段的力链强度约为上仓段的1.8倍，而角约束区域的力链强度约为无约束区域的1.2倍。这导致静侧压力峰值集中在筒仓的中下部，在角约束区附近峰值较高。排出流经历了“质量流-混合流-漏斗流”三个阶段，受角度约束的影响，排出流呈现“内低外高”的高度分布。力链在放电过程中循环形成和崩溃。约70%的测点在质量流过程中出现动压力峰值，峰值集中在流动过渡深度附近。94%点的平均动压超过GB50077-2017规范值，突出了多隔间筒仓规范的局限性。各部位均发生超压，中上段超压更为严重。给出了修正后的侧压力计算公式，为扇形筒仓的设计提供了理论参考。

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引用次数: 0

Calibration of discrete element parameters using an RBF model and effect of milling parameters on particle breakage in a hammer mill 用RBF模型标定离散元参数及磨粒参数对锤式磨粒破碎的影响

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-16 DOI: 10.1016/j.powtec.2026.122130

Qin Xiao , Chi Ma , Chiyu Huang , Zeng Liu , Huai He , Hanwen Zhang , Yu Zhou , Shuangkou Chen , Huimin Sun , Chuanyun Dai

This research utilizes the Discrete Element Method (DEM) to explore the dynamics of particle breakage in hammer mills. In order to precisely simulate the fracture behavior of pharmaceutical ingredients, the parameters of the Hertz-Mindlin with Bonding V2 (HMB V2) model which is employed to characterize particle breakage need to be appropriately calibrated. A Radial Basis Function (RBF) model was developed to efficiently calibrate HMB V2 parameters within DEM simulations of the hammer milling process. The RBF-based calibration method provides higher predictive accuracy than traditional approaches and effectively captures strongly coupled parameter interactions. The findings indicated that rotor speed and screen aperture size exerted a substantial influence on bond status, particle size distribution (PSD), and energy dissipation. Moreover, particle breakage was primarily regulated by shear forces. By taking power consumption and hammer wear, the optimal process parameters were determined. This study offers an efficient and reliable approach for DEM parameter calibration and process optimization in pharmaceutical milling.

本研究利用离散元法（DEM）对锤式磨机颗粒破碎动力学进行了研究。为了准确模拟药物成分的断裂行为，用于表征颗粒断裂的Hertz-Mindlin with Bonding V2 （HMB V2）模型的参数需要进行适当的校准。建立了径向基函数（RBF）模型，在锤击铣削过程的DEM模拟中有效地标定了HMB V2参数。基于rbf的校准方法比传统方法具有更高的预测精度，并能有效捕获强耦合参数相互作用。结果表明，转子转速和筛孔尺寸对黏结状态、粒径分布和能量耗散有较大影响。颗粒破碎主要受剪切力调控。通过计算能耗和锤头磨损，确定了最优工艺参数。该研究为制药加工过程的DEM参数标定和工艺优化提供了有效可靠的方法。

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