Powder Technology最新文献_第4页

Numerical investigation of bed hydrodynamics for biomass-coal blending in a dual fluidized bed system

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-21 DOI: 10.1016/j.powtec.2025.120807

Rabindra Kangsha Banik, Hirakh Jyoti Das, Pankaj Kalita

{"title":"Numerical investigation of bed hydrodynamics for biomass-coal blending in a dual fluidized bed system","authors":"Rabindra Kangsha Banik, Hirakh Jyoti Das, Pankaj Kalita","doi":"10.1016/j.powtec.2025.120807","DOIUrl":"10.1016/j.powtec.2025.120807","url":null,"abstract":"<div><div>Dual fluidized bed gasification (DFBG) technology yields superior syngas from a variety of feedstock. The performance of a DFBG system is greatly influenced by the hydrodynamics, heat and mass transfer within the solid-gas flow system. The hydrodynamic characteristics become more complex with the use of blended feedstock of varying physio-chemical properties owing to their non-linearity and transient nature. Therefore, it is crucial to understand hydrodynamic characteristics of such a blended gas-solid system. The present study uses Multiphase Flow with Interphase eXchanges (MFiX) simulation to examine the effects of blending biomass and coal with sand on hydrodynamics of a DFBG system. The simulation of the gasifier and riser has been performed using two-fluid model (TFM) considering constant superficial air velocities for six alternative biomass-coal blending proportions, such as 0:5, 1:4, 2:3, 3:2, 4:1, and 5:0. The numerical analysis has revealed that in biomass-coal blending, increasing the biomass fraction reduces static pressure as well as bed pressure drop, while axial voidage rises in the gasifier as well as riser. Similar to the pressure profile, the suspension density of the gasifier declines as biomass content in the blending increases. Nonetheless, voidage and solid velocity profiles in the radial direction of the gasifier and riser reveal an inverted U-shape, with biomass having the highest voidage and velocity, whereas sand possesses the lowest voidage and velocity. This study establishes the foundation for experimental investigation of the DFBG system's performance using blended feedstock.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120807"},"PeriodicalIF":4.5,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487450","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}

引用次数: 0

The hydrodynamic characteristics of a squirmer swimming in a lid-driven cavity

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-20 DOI: 10.1016/j.powtec.2025.120817

Yining Yang , Zhenyu Ouyang , Hao Ye , Jianbao Xu , Jianzhong Lin

{"title":"The hydrodynamic characteristics of a squirmer swimming in a lid-driven cavity","authors":"Yining Yang , Zhenyu Ouyang , Hao Ye , Jianbao Xu , Jianzhong Lin","doi":"10.1016/j.powtec.2025.120817","DOIUrl":"10.1016/j.powtec.2025.120817","url":null,"abstract":"<div><div>This article employs the Lattice Boltzmann method (LBM) to investigate the hydrodynamic characteristics of a squirmer, modeled after a classic microbial, swimming in a lid-driven cavity. The study analyzes the effects of self-propulsion strength (<em>β</em>), fluid inertia caused by the swimming Reynolds number (<em>Re</em><sub><em>s</em></sub>), shear Reynolds number (<em>Re</em>) of the flow field, and the particle-to-cavity size ratio <em>k</em> on the swimming behavior of the squirmer. Three typical swimming modes are defined: closed-loop swimming, periodic swimming, and directional trapping. The results show that <em>β</em> and <em>Re</em><sub><em>s</em></sub> jointly affect the transitions between these modes, with stronger self-propulsion and fluid inertia favoring directional trapping. During directional trapping, although the squirmer remains relatively stationary, it interacts with the surrounding fluid, potentially causing the development of multiple secondary vortices. Increasing <em>Re</em> induces a transition from the mode of closed-loop swimming to directional trapping, particularly when <em>Re</em> ≥ 500. The particle-to-cavity size ratio also influences the movement of the squirmer, particularly in the case of the Puller (one kind of squirmer). Pusher (the other kind of squirmer) consistently maintains the closed-loop swimming mode, while Puller experiences multiple swimming mode transitions. These findings contribute to a deeper understanding of the dynamic interactions of microswimmers in complex environments, providing valuable insights for designing microrobots for biomedical applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120817"},"PeriodicalIF":4.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487442","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}

引用次数: 0

A green approach for silicon separation and purification from diamond wire saw silicon powder waste slurry

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-20 DOI: 10.1016/j.powtec.2025.120812

Shifeng Han , Yun Li , Yile Xiong , Shicong Yang , Kuixian Wei , Wenhui Ma , Jianqiang Zhang

{"title":"A green approach for silicon separation and purification from diamond wire saw silicon powder waste slurry","authors":"Shifeng Han , Yun Li , Yile Xiong , Shicong Yang , Kuixian Wei , Wenhui Ma , Jianqiang Zhang","doi":"10.1016/j.powtec.2025.120812","DOIUrl":"10.1016/j.powtec.2025.120812","url":null,"abstract":"<div><div>During silicon wafer cutting, a significant amount of diamond wire saw silicon powder (DWSSP) waste slurry is generated, leading to severe oxidation and hindering silicon purification due to prolonged conventional processing. In this study, a green approach based on centrifugation and on-line H<sub>2</sub>SO<sub>4</sub> leaching, is proposed for the silicon separation and purification. The results indicate that under the influence of centrifugal force, rapid solid-liquid separation and impurity removal of the DWSSP waste slurry have been achieved. Direct concentrated H<sub>2</sub>SO<sub>4</sub> to the concentrated liquid eliminates acid mixing, and efficiently purifying while minimizing silicon oxidation interference, reducing total impurity content in silicon-rich powder to 54.8 ppmw. In-situ experiment verifies the total impurity content in silicon-rich powder at 99.5 ppmw, with oxygen content decreased to 2.73 %, confirming the viability of the green silicon purification approach. This study provides crucial guidance for the rapid recovery and preparation of high-purity silicon from DWSSP waste slurry.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120812"},"PeriodicalIF":4.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143487451","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}

引用次数: 0

DEM simulation of particle attrition in mechanofusion device

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-20 DOI: 10.1016/j.powtec.2025.120822

Wei Pin Goh, Mojtaba Ghadiri

引用次数: 0

Nanoadditives to mitigate jamming in cohesive granular media

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-20 DOI: 10.1016/j.powtec.2025.120756

F.J. Durán-Olivencia , M.A. Martín-Alfonso , F. Pontiga , C. Soria-Hoyo , H. Moreno , J.M. Valverde

{"title":"Nanoadditives to mitigate jamming in cohesive granular media","authors":"F.J. Durán-Olivencia , M.A. Martín-Alfonso , F. Pontiga , C. Soria-Hoyo , H. Moreno , J.M. Valverde","doi":"10.1016/j.powtec.2025.120756","DOIUrl":"10.1016/j.powtec.2025.120756","url":null,"abstract":"<div><div>Handling and conveying cohesive granular media are common challenges for many industries, which demand smooth and uninterrupted granular flows. Cohesion settles at the cores of these problems, especially at high temperatures, when it rises sharply and flow patterns become intermittent; then, jamming, halts, and shutdowns.</div><div>Here, we explore shielding limestone particles with nanoadditives to mitigate the adverse effect of cohesion, especially at high temperatures. The work focuses on concentrated solar plants assisted by the calcium looping cycle, a high-temperature environment plagued with jamming vulnerabilities. Experiments analyze the evolution of tensile strength as samples expand and fluidize freely, using three nanomaterials to coat fine limestone powders: silica, titania, and alumina. To investigate the efficacy of these coatings, samples were preconsolidated (up to 2kPa) before fluidizing at high temperatures (up to 500°C)—conditions that soften the contacts and cause cohesion to escalate. The results showed how discrete layers of nanoadditives shape stiffer surfaces, preventing particles from softening at high temperatures, and thereby limiting the contact area dilation that fuels cohesion.</div><div>Coatings were prepared considering the optimal amount of nanoadditives to introduce minimal inert material. Concentrations below 1wt% were enough to ensure uniform coatings and promote easy-flow regimes. Yet at 500°C, only alumina coatings achieved easy-flow dynamics, offering a sintering shielding effect that reduces the rise in tensile strength up to 62%. This is an outstanding conclusion to mitigate jamming in fine powders, which is paramount for a broad spectrum of granular processes that require transporting and storing cohesive granular media at high temperatures.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120756"},"PeriodicalIF":4.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508056","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}

引用次数: 0

Comparative evaluation of Peschl and FT4 full-bed rotational shear cells for powder flow characterization

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-18 DOI: 10.1016/j.powtec.2025.120810

Sara Koynov , Kristen Duda , Plinio A. De los Santos , David J. Goldfarb

{"title":"Comparative evaluation of Peschl and FT4 full-bed rotational shear cells for powder flow characterization","authors":"Sara Koynov , Kristen Duda , Plinio A. De los Santos , David J. Goldfarb","doi":"10.1016/j.powtec.2025.120810","DOIUrl":"10.1016/j.powtec.2025.120810","url":null,"abstract":"<div><div>The method of shear cell testing plays a pivotal role in assessing the flowability of powders, notably in the context of evaluating pharmaceutical formulations and processes. Despite numerous studies on shear cell methodology and its diverse applications, there remains a need to compare the performance of specific shear cell designs. This study addresses this gap by offering a comprehensive comparison of two full-bed rotational shear cells – the Peschl and FT4 cells. The evaluation focuses on assessing the precision and accuracy of each instrument, considering six materials: two reference materials with well-established behavior and four pharmaceutically relevant materials. Key parameters obtained from the measured yield loci were analyzed and compared, shedding light on the differences in performance between the two shear cells. Statistical analysis using regression methods revealed the significance of not only the test material but also the shear cell used for measurement, emphasizing the influential role of shear cell design. Additionally, this work delves into the significance of powder bed density during shear cell measurements and its broader implications for comprehensive powder characterization, providing valuable insights for the field of material science and pharmaceutical formulation.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120810"},"PeriodicalIF":4.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464409","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}

引用次数: 0

Exploration of corn starch dust combustion and explosion mechanisms via thermal decomposition and functional group changes

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-18 DOI: 10.1016/j.powtec.2025.120816

Bing Wang , Chuanbiao Zhang , Xin Zhang , Yue Zhao , Suyue Li , Runqing Liu , Shaoqian Cheng , Yanhua Lan , Yang Zhang , Weiguo Cao

{"title":"Exploration of corn starch dust combustion and explosion mechanisms via thermal decomposition and functional group changes","authors":"Bing Wang , Chuanbiao Zhang , Xin Zhang , Yue Zhao , Suyue Li , Runqing Liu , Shaoqian Cheng , Yanhua Lan , Yang Zhang , Weiguo Cao","doi":"10.1016/j.powtec.2025.120816","DOIUrl":"10.1016/j.powtec.2025.120816","url":null,"abstract":"<div><div>In specific conditions, corn starch, due to its explosive characteristics as a fine powder, can act as a catalyst for a dust explosion. In this paper, test techniques were utilized to examine the thermal decomposition and ignition process of corn starch, as well as to probe into its fundamental combustion mechanism. Upon increasing the concentration of corn starch, there was an initial tendency for both the flame propagation velocity and length to rise, followed by a subsequent decrease. The results revealed that a large amount of volatile gases was precipitated from corn starch during pyrolysis, and these gases reacted with oxygen during combustion. The reaction rate was related to the concentration of corn starch, causing the flame propagation velocity and length to initially show an increasing trend and then decrease as the concentration of corn starch increased. Combined with the In-situ DRIFTS test, the study investigated the change process of surface functional groups during the combustion of corn starch. The combustion process of corn starch conforms to the mechanism of surface heterogeneous ignition. When combustion occurred rapidly, the temperature during volatile matter combustion reflectd that of corn starch particle combustion, making corn starch more prone to surface ignition.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120816"},"PeriodicalIF":4.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143464408","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}

引用次数: 0

Mixing indices in up-scaled simulations

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-17 DOI: 10.1016/j.powtec.2025.120775

Balázs Füvesi , Christoph Goniva , Stefan Luding , Vanessa Magnanimo

{"title":"Mixing indices in up-scaled simulations","authors":"Balázs Füvesi , Christoph Goniva , Stefan Luding , Vanessa Magnanimo","doi":"10.1016/j.powtec.2025.120775","DOIUrl":"10.1016/j.powtec.2025.120775","url":null,"abstract":"<div><div>Mixing and segregation of granular materials are important industrial processes. Their accurate simulation via discrete simulations requires a large number of particles with high computational demand, which can make it infeasible for industrial scale applications. One way to solve this challenge is the usage of up-scaled simulations, where groups of small particles are replaced by larger particles, while the relevant features of the process are conserved.</div><div>In order to help improve the mixing evaluation, we review numerous mixing indices and investigate their sensitivity to factors relevant to up-scaled mixing process simulations. We test the indices in a simplified 2D model system. We focus on system-specific and statistical features.</div><div>As the main output, we provide guidelines for selecting appropriate indices and their parameters to analyse a given mixing process. We show that: (i) the average height method is simple to calculate and useful for evaluating mixing in different directions; (ii) the Lacey index performs well when the solid fraction is homogeneous; (iii) the neighbour distance method allows evaluation of mixing even without selecting a subset of particle types to trace.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120775"},"PeriodicalIF":4.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550815","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}

引用次数: 0

Study on the non-destructive evaluation of overall particle dispersion within nanocomposites by nonlinear ultrasonic and its applicability

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-17 DOI: 10.1016/j.powtec.2025.120815

Shuo Zhang , Hanqing Wang , Li Cheng , Wei Fang , Yonglin Qiu , Lijun Yang , Ruijin Liao

{"title":"Study on the non-destructive evaluation of overall particle dispersion within nanocomposites by nonlinear ultrasonic and its applicability","authors":"Shuo Zhang , Hanqing Wang , Li Cheng , Wei Fang , Yonglin Qiu , Lijun Yang , Ruijin Liao","doi":"10.1016/j.powtec.2025.120815","DOIUrl":"10.1016/j.powtec.2025.120815","url":null,"abstract":"<div><div>The dispersion of nanoparticles in nanocomposites seriously affects the material properties. However, the current nanoparticle dispersibility assessment mainly relies on the microscopic imaging method, which has the limitations of being lossy and having a narrow detection area, and is unable to realize the assessment of the overall dispersibility of the particles in bulk materials. This article uses nonlinear ultrasonic technology (NLUS) to achieve the overall dispersion evaluation of nanoparticles. Theoretical and experimental results show that: the nanoparticles nonlinear coefficient (Δ<em>β</em>) and the particle agglomeration degree (<em>K</em>) approximately satisfy the linear variation relationship (R<sup>2</sup> > 0.9), while the smaller the elastic modulus of the particles is, the larger the slope of the Δ<em>β</em>-K fitting function is; the results of the NLUS test are not affected by the factors of surface modification. The error between the NLUS nondestructive evaluation results of particle dispersion and the SEM lossy test results ranged from 3 % to 15 %. The single detection region of NLUS is a three-dimensional region of ultrasonic wave propagation and the single detection time is short, these features enable NLUS to be applied in the rapid non-destructive evaluation of the overall dispersion of large volume polymer-based nano-dielectric material particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120815"},"PeriodicalIF":4.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474416","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}

引用次数: 0

Spray freeze-drying for inhalable L-leucine, mannitol-based microparticles: The impact of process variables, L-leucine, and crystallinity on Aerosolization properties

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-02-16 DOI: 10.1016/j.powtec.2025.120788

Lorena Pasero , Adamo Sulpizi , Tomaso Guidi , Roberto Pisano

{"title":"Spray freeze-drying for inhalable L-leucine, mannitol-based microparticles: The impact of process variables, L-leucine, and crystallinity on Aerosolization properties","authors":"Lorena Pasero , Adamo Sulpizi , Tomaso Guidi , Roberto Pisano","doi":"10.1016/j.powtec.2025.120788","DOIUrl":"10.1016/j.powtec.2025.120788","url":null,"abstract":"<div><div>In this study, microparticles carrying salbutamol sulphate were produced by pneumatic spray freeze-drying. The optimal particle size was assessed through a model, associated with a design of experiments. Growing solid concentrations and <span><math><msub><mi>N</mi><mn>2</mn></msub></math></span> flow rate led to decreasing geometric diameters, while an opposite effect was associated with the feed flow rate. The aerodynamic diameter, instead, increased at increasing solid concentrations. Moreover, the role of crystallinity in determining the microparticles' flowability was evaluated upon the incorporation of L-leucine. The addition of the amino acid induced the formation of two morphologies with different degrees of crystallinity. The absence of recrystallization significantly improved the aerosolization properties of the microparticles up to a maximum fine particle fraction (48 %) and a minimum mass median aerodynamic diameter (2 μm) at 10 % (<em>w/w</em> db) L-leucine. This result disclosed the influence of polymorphism on the microparticles' cohesiveness, proving the dependency of the microparticles' aerodynamics on L-leucine and mannitol crystallinity.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"455 ","pages":"Article 120788"},"PeriodicalIF":4.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454552","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}

引用次数: 0