Powder Technology最新文献

{"title":"Experimental investigation of the packing structure of multi-sized spheres with liquid addition","authors":"Yi Zou ,&nbsp;Junqi Xu ,&nbsp;Yongli Wu ,&nbsp;Ruiping Zou ,&nbsp;Aibing Yu","doi":"10.1016/j.powtec.2025.121684","DOIUrl":"10.1016/j.powtec.2025.121684","url":null,"abstract":"<div><div>The packing of multi-sized wet spheres is highly intricate, shaped by the interplay of interparticle forces induced by the presence of liquid. This study presents a comprehensive and quantitative analysis of the microscopic particle arrangement within a multi-sized wet sphere packing. To achieve this, a multi-sized wet sphere packing is obtained experimentally and is then characterized by various analytical techniques, in terms of coordination number (CN), pair correlation function (PCF), topological and metric properties of the Voronoi-Delaunay tessellation. Through CN and PCF analysis, distinctive packing features such as agglomerates and particle chains are identified and characterized. Furthermore, the application of the Voronoi and Delaunay tessellation techniques uncovers the existence of heterogeneous clusters of particles in contact and non-contact states. These tessellation methods also shed light on the distorted pore structure that emerges within the packing. The insights gained from this study may serve to enhance the assessment and development of innovative simulation methods where capillary and liquid-related forces acting on wet particles with a size distribution are considered.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121684"},"PeriodicalIF":4.6,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217205","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":"Construction of self-assembled energetic microspheres with improved interfacial effect for enhanced safety","authors":"Wenyu Wu ,&nbsp;Changgui Song ,&nbsp;Kai Yin ,&nbsp;Xiangru Li ,&nbsp;Xiaoyan Chen ,&nbsp;Xiaojuan Fu ,&nbsp;Shuangqi Hu ,&nbsp;Xiaodong Li","doi":"10.1016/j.powtec.2025.121692","DOIUrl":"10.1016/j.powtec.2025.121692","url":null,"abstract":"<div><div>Interfacial adhesion between the explosive particles and binders is crucial for enhancing safety and combustion properties. In this study, HMX@FOX-7 self-assembled energetic microspheres with improved interfacial adhesion were constructed using coaxial droplet microchannel technology. The influence of various binders and continuous-phase concentrations on the morphology of the microspheres was investigated. The influence of binders on particle size, dispersibility, bulk density, thermal decomposition, mechanical sensitivity (impact, friction), compression mechanical properties, and combustion behavior was analyzed. Control samples were prepared from microspheres formed by the self-assembly of untreated raw material mechanical mixtures and binders. The results show that HMX@FOX-7 self-assembled energetic microspheres exhibit a highly spherical morphology, improving interfacial adhesion between explosive particles and binders, as well as the uniformity of component distribution. Compared to the control samples, the self-assembled energetic microspheres (F-HF, P-HF, and N-HF) exhibit increased thermal decomposition activation energies by 28.53, 14.12, and 11.70 kJ·mol⁻¹, along with elevated impact energies of 6.5 J, 4.5 J, and 2.5 J, and friction forces of 72 N, 60 N, and 36 N, respectively, indicating enhanced thermal stability and mechanical safety. Ignition tests indicate that self-assembled energetic microspheres based on HMX@FOX-7 high-energy particles exhibit stronger flame intensity and a tendency toward more stable combustion behavior. This study presents an innovative strategy for constructing energetic microspheres with improved interfacial adhesion and offers new insight into the structural modulation of other energetic microspheres.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121692"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155030","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":"Dynamic characteristics of gangue slurry flow in pipelines under blockage conditions: Numerical Simulations","authors":"Jiangbo Wei ,&nbsp;Lang Liu ,&nbsp;Shuangming Wang ,&nbsp;Baoning Wei ,&nbsp;Xuebin Qin ,&nbsp;Zhizhen Liu ,&nbsp;Chen Huang ,&nbsp;Qifeng Jia ,&nbsp;Dengdeng Zhuang ,&nbsp;Xiaoping Huang","doi":"10.1016/j.powtec.2025.121675","DOIUrl":"10.1016/j.powtec.2025.121675","url":null,"abstract":"<div><div>Research on the dynamic characteristics of pipeline fluids under blockage conditions is critical for mitigating blockage-related risks. This study adopts the CFD-DEM coupling method, the movement processes of coarse particles during the pipeline transportation of gangue slurry are simulated and analyzed under varying degrees of pipeline blockage and grouting speeds. The influence laws of pipeline blockage degree and grouting speed on the dynamic characteristics of the slurry within the pipeline are explored. The findings indicate that: Upon completion of grouting, the maximum fluid resistance at the pipeline bottom at the blockage position increases linearly with the increase in blockage degree. The fluid gradient pressure and its variation both increase in a power exponential manner with the blockage degree. After grouting, the maximum fluid velocity and velocity variation at the pipeline top increase in a power exponential fashion with the blockage degree, and the fluid velocity ratio exhibits a power exponential growth trend. And the variation patterns of the fluid velocity peak position and velocity ratio at the pipeline top from numerical simulations, the pipeline blockage location and degree can be accurately determined. These research results offer a scientific foundation for enabling rapid and precise blockage location, thereby mitigating blockage risks.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121675"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217286","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":"Analysis of size reduction data from applying knife mill to assess the grindability index for woody biomass","authors":"Jun Sian Lee,&nbsp;Fahimeh Yazdanpanah,&nbsp;Shahabaddine Sokhansanj","doi":"10.1016/j.powtec.2025.121651","DOIUrl":"10.1016/j.powtec.2025.121651","url":null,"abstract":"<div><div>Wood chips must undergo a crucial step of size reduction to attain suitable particle sizes for downstream processing to biofuel and bioenergy production. The ISO technical committee 238 is developing a grinding index method for cellulosic biomass. Wood chips are typically ground to particle sizes below 2 mm. We ground beech wood chips in a knife mill at varying feed rate with screen aperture size of 0.5 to 4 mm to understand the effect of feed rate on the energy consumption and the product particle size. Rittinger's and Holmes equations were fitted to the specific grinding energy data and were equally well suited to describe the energy consumption pattern. When increasing feed rate from 0.2 to 1.4 g/s while grinding on a screen aperture size of 4 mm, specific grinding energy decreased from 500 J/g to 150 J/g and the mean particle size increased from 0.79 mm to 1.02 mm.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121651"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264204","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":"Bubble interference in ultrasonic PMMA particle sizing: Mechanisms and quantitative analysis","authors":"Ping Guo,&nbsp;Ge-ge Niu,&nbsp;Feng-xian Fan,&nbsp;Ming-xu Su","doi":"10.1016/j.powtec.2025.121691","DOIUrl":"10.1016/j.powtec.2025.121691","url":null,"abstract":"<div><div>Building upon the acoustic scattering theories for both solid elastic particles and gas bubbles, we established a Monte Carlo physical model of a solid-bubble mixed system to quantitatively analyze bubble-induced interference effects to ultrasonic attenuation in micron-sized particle suspensions. Systematic numerical simulations evaluated spectral distortions and their impact on polymethyl methacrylate (PMMA) particle size inversion, focusing specifically on bubble size and gas-solid mixing ratio effects. The results demonstrate that even trace bubble concentrations significantly alter system acoustics. For instance, at a gas-to-solid mixing ratio of 0.01 %, the presence of 10 μm bubbles produced particle size inversion errors up to 15 % with the particle swarm optimization (PSO) algorithm. This observation underscores the necessity of quantifying bubble artifact interference in ultrasonic particle sizing, particularly due to their resonance scattering effects near characteristic frequencies. To experimentally validate the acoustic behavior, we performed experiments using through-transmission ultrasonic attenuation spectroscopy (1–8 MHz) combined with real-time microscopic imaging under controlled bubble generation. In a pure PMMA suspension, ultrasonic sizing gave a number-median radius of 20.3 μm, within 2.53 % of optical imaging. When bubbles were introduced (increasing voltage from 3 to 5 V), significant disturbances appeared in the ultrasonic signals. We found that when particles are smaller than bubbles (<em>R</em>_p/<em>R</em>_b &lt; 1), sizing errors rise sharply (<em>R</em>² = 0.98), whereas for <em>R</em>_p/<em>R</em>_b ≥ 1 errors remain within ±5 %.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121691"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217209","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":"A visual-probabilistic framework for analyzing nanoparticle size distribution characteristics in polymer nanocomposites containing two reinforcements","authors":"Behzad Hashemi Soudmand ,&nbsp;Amirhossein Najafi ,&nbsp;Rasool Mohsenzadeh ,&nbsp;Karim Shelesh-Nezhad","doi":"10.1016/j.powtec.2025.121689","DOIUrl":"10.1016/j.powtec.2025.121689","url":null,"abstract":"<div><div>The dispersion quality of rigid nano-inclusions significantly impacts polymer nanocomposite properties, necessitating a rigorous quantitative post-characterization of particle size distribution (PSD). This study combines probabilistic analysis with deep learning-based particle recognition for precise PSD measurement and dispersion characterization. A ternary nanocomposite of polyoxymethylene (POM), carbon black (CB), and nanoprecipitated calcium carbonate (NCC) was analyzed. <em>Z</em>-score filtering removed outliers, enabling accurate PSD histograms. Goodness-of-fit tests—Chi-Square (CS), Kolmogorov-Smirnov (KS), and Anderson-Darling (AD)—identified the Gamma distribution as the optimal PSD model. Gamma probability distribution analysis revealed that 3 wt% NCC reduced skewness and kurtosis by 18.23 % and 33.13 %, respectively, compared to POM/CB, thereby indicating improved PSD uniformity. Proportional size distribution (PRSD) analysis compared percentiles <span><math><msub><mi>P</mi><mrow><mn>10</mn><mo>,</mo><mi>A</mi></mrow></msub></math></span> and <span><math><msub><mi>P</mi><mrow><mn>90</mn><mo>,</mo><mi>A</mi></mrow></msub></math></span> with a benchmark, alongside undersized (<span><math><msub><mi>P</mi><mi>UPP</mi></msub></math></span>) and oversized (<span><math><msub><mi>P</mi><mi>OPP</mi></msub></math></span>) particle proportions. Introducing 1.5 wt% NCC reduced <span><math><msub><mi>P</mi><mrow><mn>10</mn><mo>,</mo><mi>A</mi></mrow></msub></math></span> and <span><math><msub><mi>P</mi><mrow><mn>90</mn><mo>,</mo><mi>A</mi></mrow></msub></math></span> by 34.21 % and 60.17 %, increased <span><math><msub><mi>P</mi><mi>UPP</mi></msub></math></span> by 42.17 %, and decreased <span><math><msub><mi>P</mi><mi>OPP</mi></msub></math></span> by 90.54 %, indicating finer, more consistent PSD.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121689"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217206","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":"Naturally colored and functional powder formulation for dessert: flow properties, texture, stability, and bioactive compounds","authors":"Meliza Lindsay Rojas,&nbsp;Karla Ramirez","doi":"10.1016/j.powtec.2025.121690","DOIUrl":"10.1016/j.powtec.2025.121690","url":null,"abstract":"<div><div>This research aimed to evaluate the physicochemical and flow properties of purple corn-based powdered formulations, as well as their color, syneresis, texture, and bioactive compound content when reconstituted in a porridge-like dessert. Three formulations (F1 = 2.5 % potato starch +2.5 % corn starch, F2 = 2 % potato starch +3 % corn starch, F3 = 4 % potato starch +1 % corn starch) were developed as carrier agents for a purple corn extract blended with fruits and spices. All powders exhibited low water activity (0.308–0.342), moderate hygroscopicity (11.499–12.105 gH₂O/100 g d.m) and water solubility index (26.982–30.319 g/100 g d.m), favoring storage stability. Tapped density results indicated that F3 (0.935 mg/mL) had greater compaction. Flowability tests revealed that F2 showed the best performance (Hausner ratio = 1.2; Carr index = 16.42 %). When reconstituted in porridge, the samples showed decreased color parameters (L*, a*, b*) compared to the control, associated with bioactive compound losses during drying. However, F3 maintained the highest total monomeric anthocyanin (0.360 and 0.272 mg cya-3-glu/g) content and antioxidant capacity (3.118 and 2.450 mg Trolox/g) in both control and reconstituted samples, respectively. All gels exhibited syneresis, typical in starch-based systems, but F2 showed the lowest syneresis and highest gel strength, indicating improved stability. Texture analysis demonstrated that temperature irreversibly altered gel firmness and adhesiveness, likely due to starch structural changes. This research demonstrates the technological feasibility of developing functional powdered products from purple corn, offering a natural alternative to synthetic additives and promoting the sustainable use of this native crop in value-added food applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121690"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217094","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":"Dynamics of non-spherical particles in hopper discharge – Experimental and DEM study","authors":"Ainkara Karthiga R. ,&nbsp;Aman Mittal ,&nbsp;Narasimha Mangadoddy ,&nbsp;Vikrant Verma","doi":"10.1016/j.powtec.2025.121667","DOIUrl":"10.1016/j.powtec.2025.121667","url":null,"abstract":"<div><div>Critical knowledge of the discharge of granular materials from a hopper is required to design and handle these materials efficiently in industries. The shape of a particle plays a significant role in the discharge dynamics, with irregular shapes causing more flow rate fluctuations. In this work, a pseudo-2D hopper was used to study the effect of particle shape on particle flow dynamics in the hopper experimentally and computationally. High-speed video camera-based experiments were conducted, and the particle discharge rates and velocity profiles obtained using the Matlab Tool PIVLab were analyzed for non-spherical and spherical particles. Simulations were performed using the in-house GPU-based Discrete Element Modeling (DEM) solvers. The multi-sphere and polyhedral-based DEM methods were adopted to represent the non-spherical shape, with the polyhedral DEM simulations matching closely with the experimental data. The experimental results revealed that the cubes discharged slower than the spheres due to the sharp edges of these particles. The non-spherical nature of these particles also produced flow deformities, such as arching of the particles near the hopper orifice, thereby obstructing the smooth flow. The simulation study was further extended to include three different shapes, and it was observed that with a decrease in particle sphericity, the discharge rate of the particles also decreased. Overall, this study provided analysis of the particle flow inside the hopper by means of mass flowrates, solid fractions, and the radial and axial velocity fields for the spherical and four different-shaped non spherical particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"469 ","pages":"Article 121667"},"PeriodicalIF":4.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264207","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":"Dynamic water grouting in fractured coal mass: Experimental and numerical study on granule deposition characteristics and sealing efficiency","authors":"Fuyu Wang ,&nbsp;Huimei Zhang ,&nbsp;Jiafan Zhang ,&nbsp;Xiangrui Qin ,&nbsp;Chao Yuan ,&nbsp;Gaoyang Li","doi":"10.1016/j.powtec.2025.121687","DOIUrl":"10.1016/j.powtec.2025.121687","url":null,"abstract":"<div><div>It is challenging to control the concealability and roughness of the fracture grouting process in a water-rich environment, which makes it difficult to directly observe the grout diffusion and deposition process as well as evaluate the sealing effect. Consequently, the water-blocking mechanism remains unclear. To address this issue, this paper utilized 3D printing technology to create a transparent rough fracture model based on the random midpoint displacement method and fractal theory. Additionally, an independent water grouting test system was developed to perform dynamic water grouting tests under various working conditions. The computational fluid dynamics and two-phase flow approach (CFD-TFM) is employed for numerical simulation to ascertain the slurry diffusion patterns and deposition effects at various time intervals throughout the grouting operation. Uniaxial compression and direct shear tests were conducted to evaluate the mechanical behavior of the grout-consolidated specimens. The results indicate that the rough fracture produced by the 3D printing process exhibits effective visibility, allowing for the observable trend of grouting flow. The experimental phenomena categorize the distribution pattern of dynamic water grouting into three types: cross-section water plugging pattern, comet type, and elongated streamline type. The slurry flow trend and particle deposition effect described by the CFD-TFM method are consistent with experimental observations, and all three forms—cross-section type, comet type, and slender streamline—are evident. The concrete results indicate that the particle deposition effect follows the order: cross-section type &gt; comet type &gt; slender streamline. Pressure monitoring data reveal a decreasing trend from the moving water inlet to the outlet boundary. As the distance from the grouting hole increases, the drop in sensor pressure values becomes less pronounced, resulting in reduced grouting deposition. These research findings provide a theoretical basis for the design of grouting reinforcement engineering.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121687"},"PeriodicalIF":4.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155022","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 impact of the fluidized bed agglomeration and anticaking agents on flow characteristics of the pomegranate juice powder","authors":"Emrah Eroğlu ,&nbsp;Ayhan Topuz","doi":"10.1016/j.powtec.2025.121686","DOIUrl":"10.1016/j.powtec.2025.121686","url":null,"abstract":"","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"468 ","pages":"Article 121686"},"PeriodicalIF":4.6,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155019","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}