Powder Technology最新文献_第4页

A mesoscopic DEM framework for cohesive soil hardening: Formulation, validation, and data-driven insights 黏性土壤硬化的中观DEM框架：配方、验证和数据驱动的见解

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-15 DOI: 10.1016/j.powtec.2026.122151

Da Chen, Xiaoling Wang, Dawei Tong, Binping Wu, Jiajun Wang, Zhijian Cai

The discrete element method (DEM) is widely adopted for investigating cohesive soil mechanisms at the microscale due to its capacity to directly capture particle-scale kinematics. However, its extension to the simulation of macroscopic behavior remains challenging. Applying insights from the microscale by merely upscaling particle sizes leads to incomplete physical mechanisms and poor response accuracy. To overcome these limitations, this study proposes a mesoscopic Hardening Plastic Cohesive (HPC) contact model, formulated through several advancements: (1) A solid-phase conservation framework accurately quantifies compressed void volume, which resolves persistent errors in porosity calculation; (2) Compression-plasticity-related parameters drive the soil's compressive strength and rebound collectively by governing the hardening level; (3) The friction coefficient between mesoscopic elements evolves with the saturating growth in the coordination number of their underlying microparticles during densification; (4) A tension-fracture-healing mechanism for cohesive soils is incorporated into the cohesion interaction against plastic yielding. High accuracy (average RMSE=0.0035) confirms the model's performance at 13%-25% moisture content by experimental validation. The key insights through Shapley Additive Explanations (SHAP) analysis reveal a decoupled control mechanism: hardening exponent

n_{h}

governs the overall compressive strength, while elastic ratio

λ_{e}

determines rebound magnitude. Critically, the saturation-increasing friction mechanism, controlled by the friction exponent

n_{f}

, is essential for correcting the flattening feature in the late stage of consolidation curves. The cohesive modulus

C_{c}

and cohesive exponent

n_{c}

further enhance simulation accuracy, particularly in the early stage of consolidation. Ultimately, the optimized calibration workflow with clear physics-informed characterization of HPC model achieves a balance between calibration efficiency and high-fidelity results.

离散元法（DEM）由于能够直接捕获颗粒尺度的运动学，在微观尺度上广泛应用于研究黏性土壤机制。然而，将其扩展到宏观行为的模拟仍然具有挑战性。从微观尺度应用的见解，仅仅通过扩大颗粒尺寸导致不完整的物理机制和较差的响应精度。为了克服这些局限性，本研究提出了一种介观硬化塑性内聚（HPC）接触模型，该模型通过以下几个方面的改进：(1)固相守恒框架准确地量化了压缩空隙体积，从而解决了孔隙度计算中的持续误差；(2)压缩塑性相关参数通过调控土体的硬化程度共同驱动土体的抗压强度和回弹；(3)致密化过程中，介观元件间的摩擦系数随其下垫微粒配位数的饱和增长而变化；(4)黏性土的拉伸-断裂-愈合机制被纳入黏性土对抗塑性屈服的相互作用。高精度（平均RMSE=0.0035）通过实验验证了模型在13% ~ 25%含水率下的性能。Shapley加性解释（SHAP）分析揭示了一种解耦控制机制：硬化指数nh控制整体抗压强度，而弹性比λe决定回弹幅度。关键是，由摩擦指数nf控制的饱和增加摩擦机制对于纠正固结曲线后期的平坦特征至关重要。黏结模量Cc和黏结指数nc进一步提高了模拟精度，特别是在固结初期。最终，优化的校准工作流程与清晰的HPC模型物理信息表征实现了校准效率和高保真度结果之间的平衡。

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引用次数: 0

Magnetoelectric synergy enhances droplet wetting and capture of respirable hydrophobic coal dust: Mechanisms and suppression performance 磁电协同作用增强了可吸入疏水性煤尘的液滴润湿和捕获：机制和抑制性能

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.powtec.2026.122152

Guangting Xiong , Shaocheng Ge , Shuo Liu , Weizhi Zhao , Liying Sun , Xingyu Pang

Magnetoelectric coupling technology shows considerable potential for dust pollution control, yet the wetting and adhesion mechanisms of magnetized charged droplets remain unclear. Using hydrophobic anthracite dust, this study combines experiments and numerical simulations to incorporate droplet–particle impact dynamics into a magnetoelectric-synergistic dust suppression framework. The macroscopic wetting performance and mesoscopic impact dynamics of magnetized charged droplets on coal-dust particles are investigated, and their adhesion behavior is evaluated under varying droplet–dust size ratios and relative impact velocities. The results show that magnetic–electric synergy substantially enhances droplet wettability and that an optimal set of coupling parameters exists. At 300 mT and 9 kV, the droplet surface tension decreases to 32.9 mN/m, the rebound of small droplets impacting coal dust is greatly reduced, and the surface-wetting behavior is improved, leading to a 1.4-fold increase in maximum spreading on coal-dust particles compared with ordinary water droplets. As droplet diameter increases, the impact velocity required for optimal wetting decreases. When the droplet–dust size ratio exceeds 2, most of the droplet volume makes little contribution to effective wetting and instead traps air within the liquid film, weakening liquid–dust adhesion. With increasing relative impact velocity, droplet spreading accelerates and secondary droplets are generated. When the relative impact velocity exceeds 24 m/s, the liquid–dust contact behavior shifts from surface contact to point contact, and droplet dynamics become nearly independent of the coal-dust properties. These findings provide mechanistic insights and design guidance for magnetoelectric-assisted dust suppression.

磁电耦合技术在粉尘污染控制方面显示出巨大的潜力，但磁化荷电液滴的润湿和粘附机理尚不清楚。本研究以疏水无烟煤粉尘为研究对象，结合实验和数值模拟，将液滴-颗粒碰撞动力学纳入磁电协同抑尘框架。研究了磁化荷电液滴在煤尘颗粒上的宏观润湿性能和细观冲击动力学，并对不同粒径比和相对冲击速度下的黏附行为进行了评价。结果表明，磁电协同作用显著提高了液滴的润湿性，存在一组最优耦合参数。在300 mT和9 kV条件下，液滴表面张力降至32.9 mN/m，小液滴撞击煤尘时的回弹大大减少，表面润湿行为得到改善，在煤尘颗粒上的最大扩散比普通水滴增加了1.4倍。随着液滴直径的增大，最佳润湿所需的冲击速度减小。当液滴与粉尘粒径比大于2时，大部分液滴体积对有效润湿的贡献不大，反而将空气困在液膜内，削弱液尘粘附力。随着相对冲击速度的增大，液滴扩散速度加快，产生二次液滴。当相对冲击速度超过24 m/s时，液尘接触行为由表面接触转变为点接触，液滴动力学几乎与煤尘性质无关。这些发现为磁电辅助抑尘提供了机理见解和设计指导。

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引用次数: 0

Effect of cohesion on the gravity-driven evacuation of metal powder through Triply-Periodic Minimal Surface structures 黏聚力对金属粉末通过三周期极小表面结构的重力驱动疏散的影响

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.powtec.2026.122123

Aashish K. Gupta , Christopher Ness , Sina Haeri

Evacuating the powder trapped inside the complex cavities of Triply Periodic Minimal Surface (TPMS) structures remains a major challenge in metal-powder-based additive manufacturing. The Discrete Element Method offers valuable insights into this evacuation process, enabling the design of effective de-powdering strategies. In this study, we simulate gravity-driven evacuation of trapped powders from inside unit cells of various TPMS structures. We systematically investigate the role of cohesive energy density in shaping the retention profile. Overall, we conclude that the Schwarz-P and Gyroid topologies enable the most efficient powder evacuation, remaining resilient to cohesion-induced flow hindrance. As the cohesion energy density is increased from 0 to

35 {kJ/m}^{3}

, the two geometries transition from trapping almost negligible powder to 4.10% and 22.2% respectively. However, our results reveal that powders beyond a cohesive energy density of

35 {kJ/m}^{3}

should be strictly avoided due to catastrophic retention across all TPMS structures. Furthermore, for the two unit cells, we analyse detailed kinematics and interpret the results in relation to particle overlaps and contact force distributions, finding that the Schwarz-P is uniquely hindered by transient arching. This insight is valuable for devising cost-optimized, energy-efficient protocols for de-powdering.

在金属粉末增材制造中，如何将被困在三周期最小表面（TPMS）结构复杂腔内的粉末清除出来仍然是一个主要挑战。离散元方法提供了宝贵的见解到这个疏散过程，使有效的脱粉策略的设计。在本研究中，我们模拟了在重力驱动下被困粉末从不同TPMS结构的单元胞内的疏散。我们系统地研究了内聚能密度在形成保留剖面中的作用。总的来说，我们得出的结论是，Schwarz-P和Gyroid拓扑结构能够最有效地排出粉末，并对黏结引起的流动障碍保持弹性。当聚能密度从0增加到35kJ/m3时，两种几何形状的粉末捕获率分别从几乎可以忽略的4.10%和22.2%转变。然而，我们的研究结果表明，由于所有TPMS结构的灾难性保留，应严格避免超过35kJ/m3的内聚能密度的粉末。此外，对于两个单元格，我们分析了详细的运动学并解释了与粒子重叠和接触力分布有关的结果，发现Schwarz-P受到瞬态拱的独特阻碍。这种见解对于设计成本优化、节能的脱粉方案是有价值的。

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引用次数: 0

Designing CoFe nanocrystalline powders for powder metallurgy and soft magnetic applications: Phase evolution, defect structuring and magnetic performance engineering 设计用于粉末冶金和软磁应用的CoFe纳米晶粉末：相演化、缺陷结构和磁性工程

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.powtec.2026.122131

Myriam Azabou , Fahad M. Alminderej , Abdulrahman Alsawi , Marzook Alshammari , Joan-Josep Suñol , Mohamed Khitouni

Nanocrystalline CoFe powders were synthesized by high-energy mechanical alloying and examined to correlate milling time with microstructure, morphology, and magnetic behavior. SEM, XRD/Rietveld, and VSM analyses confirmed a progressive refinement and morphological transition from coarse irregular particles to fine, near-spherical agglomerates, along with a phase evolution from CoFe biphasic (Im3̅m and P6₃/mmc) to a single BCC solid solution after 100 h. Rietveld results indicated BCC lattice expansion and strong distortion, evidencing high defect density induced by milling. These defects significantly influenced magnetic performance: coercivity remained relatively high (∼120 Oe at 10 K and ∼ 50 Oe at 100 K) while saturation magnetization stayed high (∼134 emu/g). Although these Hc values exceed classical soft magnetic limits, they are mainly governed by strain hardening and defect pinning ZFC–FC measurements under 100 Oe revealed superparamagnetic tendencies related to nanocrystalline size scale. The results confirm mechanical alloying as a viable route to engineer CoFe powders for future PM magnetic applications.

采用高能机械合金化法制备了纳米晶咖啡粉，并对其微观结构、形貌和磁性能进行了研究。SEM、XRD/Rietveld和VSM分析证实了BCC的细化和形态转变，从粗糙的不规则颗粒到细小的近球形团聚体，以及100 h后由CoFe双相（Im3′m和P6₃/mmc）到单一BCC固溶体的相演变。Rietveld结果表明BCC晶格膨胀和强畸变，表明铣削引起的高缺陷密度。这些缺陷显著影响了磁性：矫顽力保持相对较高（10k时~ 120oe， 100k时~ 50oe），而饱和磁化强度保持较高（~ 134 emu/g）。虽然这些Hc值超出了经典的软磁极限，但它们主要是由应变硬化和缺陷钉钉控制的。ZFC-FC在100 Oe下的测量显示出与纳米晶尺寸尺度有关的超顺磁趋势。结果证实，机械合金化是一种可行的路线，工程的咖啡粉，为未来的PM磁性应用。

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引用次数: 0

Deformation behavior and corrosion resistance of bio-inspired porous Ti-6Al-4V implants fabricated by selective laser melting 选择性激光熔融制备仿生多孔Ti-6Al-4V植入物的变形行为和耐蚀性

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-13 DOI: 10.1016/j.powtec.2026.122147

Xianzheng Lu , Zhizhou Guo , Xiaojie Zhou , Jian Zhang , Xiaomin Chen , Xiaotong Pang , Yan Li , Chiping Lai , Luenchow Chan

Radially graded porous implants mimic natural bone's multi-level structure by precisely tailoring porosity distributions to address complex mechanical demands in bone grafting. This study thus designed three types of radially graded bio-inspired porous Ti-6Al-4 V (TC4) implants (i.e.: Gyroid, Diamond, and Schwarz structures) with approximately 63% average porosity based on triply periodic minimal surfaces (TPMS), and fabricated via selective laser melting (SLM). Their deformation behaviors, mechanical properties, and corrosion resistance were systematically investigated using finite element analysis (FEA), compression testing, and electrochemical measurements. FEA results revealed that under compression, Gyroid and Diamond structures undergo cyclic deformation involving elastic yielding followed by progressive layer-by-layer fracture, whereas the Schwarz structure behaved similarly to brittle lattices, exhibiting a cycle of elastic yielding and bulk fracture of entire layers, eventually leading to gradual densification. These findings aligned with experimental observations: Gyroid suppressed delamination fracture through diagonal struts, Diamond showed progressive layer-by-layer compaction, and Schwarz underwent brittle collapse. The straight-through channels formed in Schwarz's orthogonal strut network (compared to the spiral/oblique channels of Gyroid/Diamond) facilitated uniform simulated body fluid (SBF) permeation and full surface coverage. This promoted the homogeneous formation of passive film, yielding superior long-term corrosion resistance (R_ct of 351.2 kΩ·cm² after 12 days immersion). In contrast, Diamond's high pore connectivity led to weakened corrosion resistance. Overall, the Schwarz structure demonstrated the closest elastic modulus to natural bone (2.25 GPa), the highest yield strength (203 MPa), and the lowest corrosion rate (1.62 × 10⁻⁵ mm·year⁻¹), satisfying both mechanical and corrosion resistance requirements for bone implants.

径向梯度多孔植入物通过精确调整孔隙度分布来模拟天然骨的多层次结构，以满足骨移植中复杂的机械需求。因此，本研究设计了三种径向梯度仿生多孔ti - 6al - 4v （TC4）植入物（即：Gyroid， Diamond和Schwarz结构），基于三周期最小表面（TPMS），平均孔隙率约为63%，并通过选择性激光熔化（SLM）制造。通过有限元分析（FEA）、压缩测试和电化学测量，系统地研究了它们的变形行为、力学性能和耐腐蚀性。有限元分析结果表明，在压缩作用下，Gyroid和Diamond结构经历了弹性屈服和逐层渐进断裂的循环变形，而Schwarz结构则类似于脆性晶格，经历了整个层的弹性屈服和整体断裂的循环，最终导致逐渐致密化。这些发现与实验观察一致：Gyroid通过对角支柱抑制分层断裂，Diamond表现出逐层渐进的压实，而Schwarz则表现出脆性塌陷。在Schwarz的正交支撑网络中形成的直通式通道（与Gyroid/Diamond的螺旋/斜通道相比）促进了均匀的模拟体液（SBF）渗透和全表面覆盖。这促进了钝化膜的均匀形成，具有优异的长期耐腐蚀性（浸泡12天后的Rct为351.2 kΩ·cm2）。相比之下，金刚石的高孔隙连通性导致其耐腐蚀性减弱。总体而言，Schwarz结构表现出与天然骨最接近的弹性模量（2.25 GPa），最高的屈服强度（203 MPa）和最低的腐蚀速率（1.62 × 10−5 mm·年−1），满足骨种植体的机械和耐腐蚀性要求。

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引用次数: 0

Enhanced hydrogen production via in-situ chemical looping reforming of fast pyrolysis volatiles from microalgae 微藻快速热解挥发物原位化学环重整强化制氢

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-12 DOI: 10.1016/j.powtec.2026.122138

Huili Huang , Zhongshun Sun , Chunyu Cheng , Gen Liu , Liyuan Fan , Bolun Yang , Chen Song , Zhiqiang Wu

Hydrogen production via in-situ chemical looping reforming of rapidly pyrolyzed volatiles from microalgae was investigated using a NiFe₂O₄@SBA-15 oxygen carrier (OC). A two-stage fixed-bed reactor system was first employed to identify optimal pyrolysis conditions for chlorella and then to systematically optimise key reforming process parameters, including the confinement strategy, temperature, OC loading, and steam addition. The reaction pathway was further clarified using ex-situ characterisation techniques, providing detailed insight into intermediate species and structural changes during the process. Results showed that hydrogen and carbon yields in the pyrolysis products increased progressively with temperature. Therefore, 600 °C was identified as the optimal condition, attributed to the abundance of hydrogen-rich volatile precursors, including hydrocarbons and light volatile species. During the reforming stage, the highest hydrogen production performance was achieved at 850 °C, with an oxygen carrier to biomass ratio of 1 g·g_microalgae⁻¹, and a steam injection volume of 0.4 mL, maintaining excellent stability over ten redox cycles. Ex-situ characterisation revealed that the controlled lattice oxygen transfer in nickel ferrite effectively promoted the selective conversion of volatiles. However, the accumulation of aldehyde intermediates and the extensive removal of oxygenated species were identified as rate-limiting steps. This study elucidates the reaction mechanism of hydrogen production via chemical looping reforming of fast microalgae pyrolysis. It provides an important theoretical basis and technical reference for green and low-carbon production of hydrogen from algal biomass.

利用NiFe2O4@SBA-15氧载体（OC）研究了微藻快速热解挥发物的原位化学环重整制氢。首先采用两级固定床反应器系统确定小球藻的最佳热解条件，然后系统优化禁闭策略、温度、OC负荷和蒸汽添加等关键重整工艺参数。利用非原位表征技术进一步阐明了反应途径，提供了对过程中中间物种和结构变化的详细了解。结果表明，随着温度的升高，热解产物中氢和碳的产率逐渐升高。因此，600°C被确定为最佳条件，因为富含氢的挥发前体，包括碳氢化合物和轻挥发物质。重整阶段，在850℃条件下，氧载体与生物量比为1 g·gmicroalgae - 1，注汽量为0.4 mL，产氢性能最高，在10个氧化还原循环中保持良好的稳定性。非原位表征表明，镍铁氧体中可控的晶格氧转移有效地促进了挥发物的选择性转化。然而，醛中间体的积累和氧化物种的广泛去除被认为是限速步骤。本研究阐明了微藻快速热解化学环重整制氢的反应机理。为藻类生物质绿色低碳制氢提供了重要的理论依据和技术参考。

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引用次数: 0

High pressure dewatering rolls: Effect of process variables on cake solids concentration and throughput 高压脱水辊：工艺变量对饼固体浓度和产量的影响

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-12 DOI: 10.1016/j.powtec.2026.122139

Sajid Hassan, Raul Cavalida, Peter J. Scales, Robin J. Batterham, Anthony D. Stickland

The High Pressure Dewatering Rolls (HPDR) is a novel solid–liquid separation technology that combines compression, vacuum, and shear to enhance dewatering of fine mineral suspensions without requiring filter cloths. This study explores how roller speed, shear, feed concentration, flocculation, particle size distribution, and minimum roller gap affect HPDR performance using well-characterised calcium carbonate suspensions.

Increasing roller speed reduced cake solids concentration due to shorter dewatering times, but increased solids throughput up to an optimal speed near 4 rpm. At 7 rpm, throughput decreased due to material floating on top of the rollers and not passing through the nip effectively. Introducing shims to maintain a minimum roller gap eliminated floating and improved throughput by allowing more cake to pass through the nip.

For the coarser suspension, moderate speed difference (5%) slightly improved both performance measures: the highest cake solids concentration of 84.3 wt% was achieved at 0.5 rpm, while the maximum throughput of 445 kg/m².hr occurred at 4 rpm. Flocculation reduced solids passing through the filter and reporting to the filtrate, while adding 20% ultrafine calcium carbonate improved cake packing, reaching 87.9 wt% solids at low speed.

These results highlight the trade-offs between roller speed, shear, gap size, and feed properties in HPDR operation. Optimising these variables is essential to achieve both high throughput and cake solids, supporting the potential of HPDR as an effective dewatering solution for fine and compressible suspensions.

高压脱水辊（HPDR）是一种新型的固液分离技术，它结合了压缩、真空和剪切，可以在不需要滤布的情况下增强对细矿物悬浮物的脱水。本研究探讨了使用表征良好的碳酸钙悬浮液，辊速、剪切、进料浓度、絮凝、粒径分布和最小辊隙对HPDR性能的影响。由于脱水时间缩短，提高辊速降低了饼状固体浓度，但增加了固体吞吐量，达到最佳速度，接近4转/分。在7 rpm时，由于物料漂浮在滚筒顶部而不能有效地通过压口，吞吐量下降。引入垫片以保持最小的辊隙，消除了浮动，并通过允许更多的饼通过压口提高了吞吐量。对于较粗的悬浮液，适度的速度差（5%）略微改善了两项性能指标：在0.5 rpm时达到最高的饼固体浓度84.3 wt%，而最大吞吐量为445 kg/m2。Hr发生在4rpm。絮凝降低了通过过滤器并上报滤液的固相，而添加20%超细碳酸钙改善了滤饼的填料，低速时固相达到87.9%。这些结果突出了辊速、剪切、间隙大小和给料性能在HPDR操作中的权衡。优化这些变量对于实现高通量和饼状固体至关重要，支持HPDR作为细颗粒和可压缩悬浮液的有效脱水解决方案的潜力。

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引用次数: 0

Determination of the thermal contact resistance at the solid–powder interface in laser powder bed fusion manufacturing of stainless steel 激光粉末床熔炼不锈钢固粉界面接触热阻的测定

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-12 DOI: 10.1016/j.powtec.2025.122075

S. Ye, L. Brackmann, S. Weber, S. Benito

Among various additive manufacturing (AM) methods, powder bed fusion–laser beam/metal (PBF-LB/M) stands out due to its rapid prototyping capabilities and design flexibility. The simulation of the PBF-LB/M process is receiving growing attention from both the scientific community and industry with the goal of optimizing process parameters, broadening the range of usable materials, or realizing in-situ heat treatments. A deeper understanding of the dynamic heat balance during the PBF-LB/M process, particularly the heat transfer between the part and the surrounding powder during manufacturing, has become an indispensable factor. This study investigates the thermal contact resistance between solid and powders using DIN EN 1.4404 as a model material, an austenitic stainless steel selected for its widespread use in PBF-LB/M and its favorable high-temperature properties. A novel ceramic sample holder is developed that can combine solid and powder materials to create a contact pair as a measurement system, thereby minimizing the influence on the results. By measuring the time–temperature response curves of solid–powder contact pairs after heating at different temperatures using the laser-flash method, the response curves were analyzed using two methods: a mathematical analytical method and a finite element simulation method to determine the thermal contact resistance. The two employed methods can efficiently describe thermal contact resistance and are well-suited for application in numerical simulations.

在各种增材制造（AM）方法中，粉末床融合激光束/金属（PBF-LB/M）因其快速成型能力和设计灵活性而脱颖而出。PBF-LB/M过程的模拟越来越受到科学界和工业界的关注，其目的是优化工艺参数，扩大可用材料的范围，或实现原位热处理。深入了解PBF-LB/M过程中的动态热平衡，特别是制造过程中零件与周围粉末之间的热量传递，已成为不可或缺的因素。本研究使用DIN EN 1.4404作为模型材料，研究固体和粉末之间的热接触电阻，选择奥氏体不锈钢，因为它在PBF-LB/M中广泛使用，并且具有良好的高温性能。开发了一种新型陶瓷样品夹，它可以结合固体和粉末材料来创建一个接触对作为测量系统，从而最大限度地减少对结果的影响。利用激光闪蒸法测量固体-粉末接触对在不同温度下加热后的时间-温度响应曲线，采用数学解析法和有限元模拟法对响应曲线进行分析，确定接触热阻。这两种方法都能有效地描述接触热阻，适合于数值模拟。

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引用次数: 0

A hybrid FVM-DEM framework for simulating explosion-driven dynamics of granular materials 颗粒材料爆炸驱动动力学模拟的混合FVM-DEM框架

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-12 DOI: 10.1016/j.powtec.2026.122136

Yang-Yang Zhang, Wen-Jie Xu, Lin Liu

The phenomenon of explosion-driven particles is widely present in fields such as industrial manufacturing and military technology, making the accurate and efficient characterization of their dynamic behaviors critically important. To better perform the simulation of explosion-driven multiparticle systems, a GPU-accelerated FVM-DEM framework is presented. The framework employs a Godunov scheme with HLLC solver and the second-order Runge-Kutta scheme to achieve high-accuracy solutions for the shock wave governing equations and uses the DEM contact model to precisely capture interactions between particles. The complex dynamics between the shock wave and particles are efficiently resolved using the unresolved coupling algorithm, with all core computations executed on GPU for enhanced computational efficiency. Validation against two-dimensional Riemann problems and shock-driven particles bed cases demonstrates the framework’s high accuracy and stability, enabling precise simulation of shock wave propagation as well as the interactions between particles and shock waves. Large-scale three-dimensional simulations based on this framework systematically reveal the dynamic evolution characteristics of cohesive particle systems driven by explosions. As the cohesion strength increases, the behavior of the particles gradually evolves from uniformly dispersed radial diffusion to a predominantly aggregated state characterized by large-scale clusters, which significantly enhances the overall strength and damage resistance of the system. Meanwhile, the formed clusters in turn induces a redistribution of the fluid field. Overall, this framework provides technical support for the investigation of dynamic mechanisms in complex explosion-driven granular materials.

爆炸驱动颗粒现象广泛存在于工业制造和军事技术等领域，因此准确、高效地表征其动力学行为至关重要。为了更好地模拟爆炸驱动的多粒子系统，提出了一种gpu加速的FVM-DEM框架。该框架采用带HLLC求解器的Godunov格式和二阶龙格-库塔格式来实现激波控制方程的高精度解，并使用DEM接触模型来精确捕获粒子间的相互作用。采用未解析耦合算法对激波与粒子之间的复杂动力学进行高效解析，所有核心计算均在GPU上进行，提高了计算效率。对二维黎曼问题和激波驱动粒子床案例的验证表明，该框架具有高精度和稳定性，能够精确模拟激波传播以及粒子与激波之间的相互作用。基于该框架的大尺度三维模拟系统地揭示了爆炸驱动下内聚粒子系统的动态演化特征。随着内聚强度的增加，颗粒的行为逐渐从均匀分散的径向扩散演变为以大规模团簇为特征的主要聚集状态，显著提高了体系的整体强度和抗损伤能力。同时，形成的团簇反过来又引起了流场的重新分布。总体而言，该框架为复杂爆炸驱动颗粒材料动力学机制的研究提供了技术支持。

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引用次数: 0

Determination of relation between Particle Size Distribution parameters (PSD), fractal dimension (Df) and the flocculation index (FI) obtained by the Photometric Dispersion Analyzer (PDA) 光度分散分析仪（PDA）测定絮凝指标与粒径分布参数（PSD）、分形维数（Df）的关系

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology

Pub Date : 2026-01-12 DOI: 10.1016/j.powtec.2026.122137

Sabrina de Oliveira Anício , Verônica dos Santos Lopes , André Luiz de Oliveira

This study investigates the relationship between Particle Size Distribution (PSD), Fractal Dimension (D_f), and the Flocculation Index (FI) during conventional water treatment processes. Using Aluminum Sulfate (AS) and Polyaluminum Chloride (PAC) as coagulants, experiments were conducted on water with turbidities of 10, 50, and 100 NTU. PSD and D_f parameters were derived from digital image analysis (ImageJ software), while FI was measured using a Photometric Dispersion Analyzer (PDA). Statistical analysis via R software revealed significant linear and nonlinear regressions between FI and PSD/D_f parameters, particularly for β₁ (characteristic PSD parameter) and equivalent diameter. The findings demonstrate that FI can serve as a reliable indicator for estimating PSD and D_f, enabling real-time monitoring of floc formation. The study highlights the potential of these relationships to optimize coagulation/flocculation processes, with Aluminum Sulfate showing particularly robust statistical significance.

研究了常规水处理过程中粒径分布（PSD）、分形维数（Df）和絮凝指数（FI）之间的关系。以硫酸铝（AS）和聚合氯化铝（PAC）为混凝剂，在浊度为10、50和100 NTU的水中进行了混凝实验。PSD和Df参数由数字图像分析（ImageJ软件）得出，而FI使用光度色散分析仪（PDA）测量。通过R软件进行统计分析，发现FI与PSD/Df参数之间存在显著的线性和非线性回归，特别是β1（特征PSD参数）和等效直径。研究结果表明，FI可以作为估算PSD和Df的可靠指标，实现对浮体形成的实时监测。该研究强调了这些关系优化混凝/絮凝过程的潜力，硫酸铝显示出特别强大的统计意义。

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引用次数: 0