Powder Technology最新文献

{"title":"Micromechanical analysis of shear characteristics of core pile-cemented soil interface in stiffened deep cement mixing pile","authors":"Yu-Liang Yan ,&nbsp;Bang-Long Xie ,&nbsp;Zi-Jian Hu ,&nbsp;Yong-Chao Liu","doi":"10.1016/j.powtec.2025.120961","DOIUrl":"10.1016/j.powtec.2025.120961","url":null,"abstract":"<div><div>The shear behavior of the core pile-cemented soil interface is crucial for understanding the load transfer mechanism of stiffened deep cement mixing (SDCM) piles. In this study, a core pile-cemented soil shear model was developed using the continuum-discrete coupling method in order to investigate the shear characteristics of the core pile-cemented soil interface from the microscopic perspective. The core pile-cemented soil interaction during shear was analyzed, including the number of core pile-cemented soil contacts, the porosity, the force chain and the contact force characteristics, etc., and the reasons for the change of the interface skin friction with the relative displacement in three stages were explained. The results show that interface skin friction increases with displacement due to bond strength and force chain formation during the initial shear stage. Beyond the peak, bond failure and force chain collapse cause particle rearrangement and skin friction reduction. Finally, the skin friction remains stabilized due to horizontal particle interlocking and tangential sliding. Furthermore, the effects of core pile-cemented soil interface bond strength, core pile diameter and vertical pressure at the top of the soil on the core pile-cemented soil shear characteristics were investigated. Finally, a constitutive model of skin friction-relative displacement response for core pile-cemented soil interface considering the soil confining pressure around the pile was proposed. This study reveals the microscopic mechanism of shear at the core pile-cemented soil interface and provides guidance for evaluating the bearing capacity of SDCM piles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120961"},"PeriodicalIF":4.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748000","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":"Experimental study of the breakup characteristics and droplet characteristics of centrifugal atomization","authors":"Yanzhen Wu ,&nbsp;Yijian He ,&nbsp;Zhengbin Pan ,&nbsp;Bo Kong ,&nbsp;Baohong Tong","doi":"10.1016/j.powtec.2025.120969","DOIUrl":"10.1016/j.powtec.2025.120969","url":null,"abstract":"<div><div>This study delves into the dynamics of centrifugal atomization, a phenomenon with wide-ranging applications, from aerospace fuel systems to agricultural sprayers and chemical reactors. We aim to uncover the mechanisms of jet disintegration in rotating environments, offering insights to enhance performance and efficiency across various industries. An experimental rig was designed to capture the breakup dynamics of rotating jets. Using high-speed photography, we observed that when rotated jets experience varying radial and axial pressure differences depending on the operating conditions. These differences notably affect the breakup process and droplet distribution. Our key findings include that, as the Weber number for the liquid (<em>We</em>_<em>t</em>) increases, breakup becomes more pronounced, leading to shorter breakup lengths and uniformly sized droplets, often transforming a bimodal droplet distribution into an unimodal one. In contrast, changes in the Weber number based on the orifice size (<em>We</em>_<em>o</em>) had a lesser impact on droplet patterns, with larger <em>We</em>_<em>o</em> values resulting in longer breakup distances. Additionally, a decrease in the size of the orifice shortened the break-up distance and shifted the droplet sizes from the bimodal to the unimodal distribution. These results illuminate the influence of operational parameters on jet breakup characteristics, highlighting the potential for optimizing droplet distribution through precise parameter adjustment. Our study advances the understanding of centrifugal atomization, promising to enhance the design and efficacy of industrial and commercial systems that rely on controlled fluid atomization.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120969"},"PeriodicalIF":4.5,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738142","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":"Preparation and flow characterization of Al2O3/FeNi composite powders for additive manufacturing","authors":"Jinli Xiang ,&nbsp;Guixiang Zhang ,&nbsp;Yandan Xia ,&nbsp;Linzhi Jiang ,&nbsp;Haozhe Zhang ,&nbsp;Yugang Zhao ,&nbsp;Guoyong Zhao ,&nbsp;Haiyun Zhang","doi":"10.1016/j.powtec.2025.120967","DOIUrl":"10.1016/j.powtec.2025.120967","url":null,"abstract":"<div><div>Al₂O₃/FeNi composite powders for powder bed 3D printing are prepared and characterized by gas-solid two-phase flow atomization method. The effects of atomization pressures of 3, 4, 5, 6 and 7 MPa on the morphology, particle size distribution and ceramic phase distribution of the prepared composite powders are investigated, and the composite powders prepared at the optimal atomization pressure (5 MPa) are characterized for their flowability. The results show that with the increase of atomization pressure, the morphology of the composite powder gradually changes from elongated to spherical, the particle size gradually decreases, and the distribution of ceramic phase is gradually sparse. When the atomization pressure is 5 Mpa, the composite powder has a high spherical shape, the ceramic phase is relatively uniformly distributed, and the particle size distribution is concentrated in the range of 40–60 μm. Comparison of the composite powders at the optimum atomization pressure with the alloy powders under the same atomization conditions shows that they have the same “good” flowability. However, many of the flow properties still differ due to the presence of Al₂O₃ particles on the surface. This paper provides an innovative method for preparing ceramic/metal-based composite powders for 3D printing.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120967"},"PeriodicalIF":4.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724514","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":"Mixing characteristics of micron-sized cohesive particles induced by high-intensity vertical vibration","authors":"Huibin Wang ,&nbsp;Zhe Sun ,&nbsp;Yuxin Jia ,&nbsp;Wenzhe Ma ,&nbsp;Xiaobin Zhan","doi":"10.1016/j.powtec.2025.120966","DOIUrl":"10.1016/j.powtec.2025.120966","url":null,"abstract":"<div><div>The mixing characteristics of micrometer-sized cohesive particles under the action of high-intensity vertical vibration were investigated by the discrete element method (DEM). To reduce the computational burden of simulation studies of micron-sized particles, coarse-grained treatment of particles is performed. This study encompasses an analysis of the motion states and collision dynamics of the micron-sized cohesive particles. Under vertical vibration, the combined force on the particles by the container dominates the agglomeration and dispersion between particles. Agglomeration and dispersion will gradually reach an equilibrium state, which presents the final mixing index. An increase in either vibration amplitude or frequency improves the mixing rate and effective power but reduces the mixing quality when further increased. An increase in the surface energy between particles increases the interparticle viscosity, which significantly reduces the mixing rate and improves the mixing quality, but also increases the energy required to reach the stabilization stage. An increase in container height has an enhancing effect on the mixing quality and effective power and does not increase the energy absorbed to reach the stabilization phase. From the analysis of collision dynamics, the vibration parameters and container height all affect the mixing state by changing the collision energy between particles, while surface energy changes the inter-particle separation energy. The research will help to reveal the microscopic phenomena of particle motion and to find support for more efficient and less energy-intensive mixing conditions during the mixing of micron-sized cohesive particles under vertical vibration.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120966"},"PeriodicalIF":4.5,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738138","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":"Experimental and numerical study on a new radial hydrocyclone with flow field conditioning","authors":"Zhengrui Hu ,&nbsp;Meili Liu ,&nbsp;Yongxiang Feng ,&nbsp;Zheyuan Zhang ,&nbsp;Jiaqing Chen ,&nbsp;Pingping Qiao","doi":"10.1016/j.powtec.2025.120947","DOIUrl":"10.1016/j.powtec.2025.120947","url":null,"abstract":"<div><div>Hydrocyclones are widely utilized in the oil-water separation domain. In this paper, a novel radial hydrocyclone is proposed, which is developed by modulating the turbulence of an axial hydrocyclone. The flow field obtained from numerical simulation reveals that radial hydrocyclone achieves a more favorable phase and velocity distribution. This characteristic facilitates the convergence and discharge of oil droplets within the hydrocyclones, as it features lower turbulent kinetic energy, higher tangential velocity, and enhanced stability. Experimental results regarding the separation performance demonstrate that the oil concentration at the heavy phase outlet of the radial hydrocyclone is reduced by up to 38.4 % compared with that of the axial hydrocyclone. This oil concentration increases with an increase of split ratio and inlet water content, while it decreases as the inlet flow rate increases. When the inlet water content increases from 70 % to 99 %, the oil concentration ranges from 67 mg/L to 447 mg/L. When the split ratio increases from 35 % to 65 %, the oil concentration varies from 108 mg/L to 700 mg/L. Within a range of ±20 % design flow rate, the oil concentration spans from 283 mg/L to 789 mg/L. Both experimental and simulation results indicate that turbulence regulation can significantly improve the performance of hydrocyclones, enhancing both the separation efficiency and the robustness of the system.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120947"},"PeriodicalIF":4.5,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705572","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":"Study on flow characteristics in liquid-solid circulating fluidized beds with evenly distributed pulsating liquid flows","authors":"Yangfan Song,&nbsp;Ruipeng Shi,&nbsp;Liuping He,&nbsp;Yunyi Li,&nbsp;Xiang Wei,&nbsp;Hongwei Chen,&nbsp;Zhuo Liu","doi":"10.1016/j.powtec.2025.120951","DOIUrl":"10.1016/j.powtec.2025.120951","url":null,"abstract":"<div><div>Liquid-solid circulating fluidized beds, known for their significant liquid-solid velocity differences and efficient interphase mixing, are widely utilized in the fields of chemical engineering and environmental biology, significantly advancing industrial processes. To further enhance the reactor's heat and mass transfer efficiency, this work designs a liquid-solid circulating fluidized bed reactor featuring an evenly distributed pulsating liquid flow, building upon the introduction of pulsating liquid flow. This work employs a combination of numerical simulation and experimental methods to investigate the effects of various pulsating liquid flow parameters, such as period and amplitude, as well as the steady liquid flow velocity on the reactor's flow characteristics. The results indicate that the configuration condition of the flow significantly impacts the flow characteristics, whereas the effect of the pulsation period on the flow characteristics is less pronounced compared to the amplitude of the liquid flow. Across various conditions, the introduction of evenly distributed pulsating liquid flow enhances the interphase relative velocity and the average solids holdup in the bed, thereby improving the reactor's efficiency. Among various configurations, the six-split liquid flow configuration demonstrates the most balanced flow characteristics, exhibiting relatively uniform radial particle distribution, high bed space utilization efficiency, and effective exploitation of turbulent kinetic energy from pulsating liquid flows.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120951"},"PeriodicalIF":4.5,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696126","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":"Streamlining crystallization process scale-up using statistical modeling of experiments and complementary CFD flow fields","authors":"Álmos Orosz ,&nbsp;Levente Sandor ,&nbsp;Khadijeh Firoozirad ,&nbsp;Eva Pusztai ,&nbsp;Peter Nagy-Gyorgy ,&nbsp;Botond Szilagyi","doi":"10.1016/j.powtec.2025.120934","DOIUrl":"10.1016/j.powtec.2025.120934","url":null,"abstract":"<div><div>Our paper presents a simple method that bridges computational fluid dynamics (CFD) simulations with systematic experimentation using multivariable statistics, which was developed in the spirit of rapid applicability, quick transferability, and practical simplicity in the process development and scale-up stage. This applies to technologies that have already been developed on a small scale, and it applies when the focal point of scale-up is the stirring conditions, rather than heat transfer or other issues. We propose identifying the predictive CFD variables on the measured CQAs and then training a predictive model that allows us to estimate the CQAs from the simulated flow fields in a technology transfer. The case study of cooling crystallization of L-glutamic acid demonstrates the workflow. Small-scale experiments (0.5 L) are performed with varied active volume and agitation rates, and the particle size distributions (PSD) of the products are measured. The corresponding quasi-steady-state CFD simulations were executed to obtain the flow field using the <span><math><mrow><mi>k</mi><mo>−</mo><mi>ɛ</mi></mrow></math></span> turbulence model. A partial least squares (PLS)–based recursive feature selection identified the predictive mixing parameters from the plethora of available CFD variables and simultaneously built a predictive model for the product CQA-s. Five critical CFD variables were identified in this case study, all related to the shear-rate distributions. The calibrated optimal PLS model had two components, and allowed the prediction of the mean sizes of the product, that is, <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>v</mi><mn>10</mn></mrow></msub></math></span>, <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>v</mi><mn>50</mn></mrow></msub></math></span>, and <span><math><msub><mrow><mi>D</mi></mrow><mrow><mi>v</mi><mn>90</mn></mrow></msub></math></span> on a 5 L scale with 0.2, 16.4, and <span><math><mrow><mn>1</mn><mo>.</mo><mn>2</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> deviation from the measured values. This data-driven method simplifies and accelerates the CFD-based scale-up under certain conditions (moderate nonlinearities, flow-centric problem) but does not aim to replace the meticulously identified nonlinear first-principles models.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120934"},"PeriodicalIF":4.5,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical investigation of segregation and mixing in bidisperse systems using the coarse-grained CFD-DEM approach","authors":"Janna Grabowski ,&nbsp;Nico Jurtz ,&nbsp;Viktor Brandt ,&nbsp;Leana Obermeier ,&nbsp;Harald Kruggel-Emden ,&nbsp;Matthias Kraume","doi":"10.1016/j.powtec.2025.120922","DOIUrl":"10.1016/j.powtec.2025.120922","url":null,"abstract":"<div><div>Bi- and polydisperse granular materials are widely used in various industries and are an essential subject of current research. The modeling of such systems using the Discrete Element Method (DEM) is computationally very demanding. Therefore, it is limited to lab-scale systems. A common approach to solve this issue is to summarize a specific number of original particles into large grains using the so-called coarse-grain approach (CG). This study examines the accuracy of the CG approach in bidisperse systems. First, a mechanically agitated system is studied under wall and periodic boundary conditions, ranging from minimal segregation to pronounced segregation with a visible Brazil nut effect. The ascending velocity of large grains increases by a factor of 2.1, marking this transition. Second, a fluidized bed with different particle diameter ratios and fluidization velocities is simulated, showing mixing or segregation depending on the settings. The mixing index ranges from 27% to 98%. The simulations are repeated for varying levels of coarsening, keeping either the CG factor or the grain diameter constant for the respective particle types, to assess the limitations and effectiveness of scaling strategies for bidisperse granular systems. Scaling with a constant grain diameter more accurately represents fluidized bed systems with a low particle-diameter ratio (<span><math><mrow><msub><mrow><mi>d</mi></mrow><mrow><mi>S</mi></mrow></msub><mo>/</mo><msub><mrow><mi>d</mi></mrow><mrow><mi>L</mi></mrow></msub><mo>=</mo><mn>0</mn><mo>.</mo><mn>2</mn></mrow></math></span>), while the impact of the coarsening strategy diminishes as particle sizes become more similar (<span><math><mrow><msub><mrow><mi>d</mi></mrow><mrow><mi>S</mi></mrow></msub><mo>/</mo><msub><mrow><mi>d</mi></mrow><mrow><mi>L</mi></mrow></msub><mo>&gt;</mo><mn>0</mn><mo>.</mo><mn>2</mn></mrow></math></span>). In mechanically agitated systems, scaling with a constant CG factor amplifies the Brazil nut effect, whereas a fixed grain diameter leads to a weaker prediction.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120922"},"PeriodicalIF":4.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"4D spatio-temporal visualization of solid volume fraction in molten sodium chloride during crystallization process by multi-layered thermal-resistive electrical resistance tomography (ml-trERT)","authors":"Alief Avicenna Luthfie ,&nbsp;So Segawa ,&nbsp;Prima Asmara Sejati ,&nbsp;Yosephus Ardean Kurnianto Prayitno ,&nbsp;Noritaka Saito ,&nbsp;Masahiro Takei","doi":"10.1016/j.powtec.2025.120938","DOIUrl":"10.1016/j.powtec.2025.120938","url":null,"abstract":"<div><div>Solid volume fraction <span><math><mmultiscripts><mi>φ</mi><mprescripts></mprescripts><mspace></mspace><mi>S</mi></mmultiscripts></math></span> in molten sodium chloride (NaCl) during the crystallization proces has been visualized in 4D spatio-temporal (3D spatial + 1D temporal) by multi-layered thermal-resistive electrical resistance tomography (<em>ml-tr</em>ERT). In the <em>ml-tr</em>ERT, a total of 24 platinum wire electrodes (Pt-electrodes) were employed as melt-resistive sensors and arranged in a multi-layered configuration <span><math><mfenced><mrow><mi>z</mi><mo>=</mo><mn>15</mn><mspace></mspace><mi>mm</mi></mrow><mrow><mi>z</mi><mo>=</mo><mn>10</mn><mspace></mspace><mi>mm</mi></mrow><mrow><mtext>and</mtext><mspace></mspace><mi>z</mi><mo>=</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></mfenced></math></span> with eight electrodes per layer in the vicinity of a cylindrical alumina crucible as the container. As the results, the <span><math><mmultiscripts><mi>φ</mi><mprescripts></mprescripts><mspace></mspace><mi>S</mi></mmultiscripts></math></span> in the molten sodium chloride was dynamically increase during the crystallization process (<span><math><mn>1076.55</mn><mspace></mspace><mi>K</mi><mo>&gt;</mo><mi>T</mi><mo>&gt;</mo><mn>1068.82</mn><mspace></mspace><mi>K</mi></math></span>). A significant increase in the spatially averaged solid volume fraction <span><math><mfenced><mmultiscripts><mi>φ</mi><mprescripts></mprescripts><mspace></mspace><mi>S</mi></mmultiscripts></mfenced></math></span> is observed at the beginning of the crystallization process, represents crystal nucleation. Subsequently, slight increase in the <span><math><mfenced><mmultiscripts><mi>φ</mi><mprescripts></mprescripts><mspace></mspace><mi>S</mi></mmultiscripts></mfenced></math></span> represents larger crystal formation which diffused from top to bottom layer. In order to validate the results by the <em>ml-tr</em>ERT, a qualitative and quantitative validation with transient enthalpy porosity (TEP) model were employed. According to the validation, the <em>ml-tr</em>ERT results are in a good agreement qualitatively and quantitatively with the TEP model with temporally averaged relative error <span><math><msub><mover><mi>δ</mi><mo>¯</mo></mover><mrow><mi>z</mi><mo>=</mo><mn>15</mn><mspace></mspace><mi>mm</mi></mrow></msub><mo>=</mo><mn>0.043</mn></math></span>, <span><math><msub><mover><mi>δ</mi><mo>¯</mo></mover><mrow><mi>z</mi><mo>=</mo><mn>10</mn><mspace></mspace><mi>mm</mi></mrow></msub><mo>=</mo><mn>0.042</mn></math></span>, and <span><math><msub><mover><mi>δ</mi><mo>¯</mo></mover><mrow><mi>z</mi><mo>=</mo><mn>5</mn><mspace></mspace><mi>mm</mi></mrow></msub><mo>=</mo><mn>0.054</mn></math></span>.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120938"},"PeriodicalIF":4.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734978","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 influence of bubble size on critical detachment flow field parameters of bubble-particle aggregate in an isotropic turbulence field: Experiment and simulation","authors":"Wenqing Shi ,&nbsp;Hongji Chen ,&nbsp;Shihao Ding ,&nbsp;Xiahui Gui ,&nbsp;Yijun Cao ,&nbsp;Yaowen Xing","doi":"10.1016/j.powtec.2025.120960","DOIUrl":"10.1016/j.powtec.2025.120960","url":null,"abstract":"<div><div>Bubble plays an essential role in the flotation process, and their size has a significant impact on the bubble-particle interaction. However, the critical fluid parameters for particle detachment from bubbles of different sizes remain unclear. To address this, an isotropic turbulent field was generated using a customized oscillating grid system, systematically investigating the influence of bubble size on critical detachment flow field parameters of bubble-particle aggregate in an isotropic turbulence field. Additionally, numerical simulations were employed to extract key fluid parameters within the oscillating grid system. The results indicate that the flow field exhibits a sinusoidal periodic variation with grid motion. A highly homogeneous isotropic turbulent field was generated in the central region of the tank, and both velocity and vorticity in this region increase with oscillation frequency. Through the analysis of the bubble-particle detachment dynamics, it was found that larger bubbles tend to detach more easily from the particle surface. Furthermore, the detachment process can be divided into three distinct stages: bubble sliding, bubble shrinkage, and bubble necking rupture. Finally, based on experimental and numerical simulations, the critical flow field parameters for bubble detachment from particle surfaces at different bubble sizes were determined.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"458 ","pages":"Article 120960"},"PeriodicalIF":4.5,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705573","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}