Powder Technology最新文献_第5页

A novel DEM for coal–rock dynamic failure based on grain reconstruction and dynamic–static mechanical behaviour calibration 基于颗粒重构和动静力学行为定标的煤岩动态破坏DEM

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-10 DOI: 10.1016/j.powtec.2025.121101

Bosheng Hu , Yongping Wu , Panshi Xie , Hongwei Wang , Hu Wen

{"title":"A novel DEM for coal–rock dynamic failure based on grain reconstruction and dynamic–static mechanical behaviour calibration","authors":"Bosheng Hu , Yongping Wu , Panshi Xie , Hongwei Wang , Hu Wen","doi":"10.1016/j.powtec.2025.121101","DOIUrl":"10.1016/j.powtec.2025.121101","url":null,"abstract":"<div><div>Most dynamic coal rock failures in the field undergo a multistage process from qua-sistatic to dynamic loading. In investigations of the dynamic failure of coal rock via numerical simulation, the mechanical behaviour must be considered at each stage of the static and dynamic loading process. However, when using existing discrete element method (DEM), the microstructure of coal rock is usually ignored, and the calibration process of the model micromechanical parameters is flawed. This has led to a knowledge gap in the development of DEM for coal rock. Therefore, in this study, DEM simulation is proposed on the basis of particle reconstruction and dynamic–static behaviour calibration to analyse the dynamic damage of coal rock. First, a Voronoi polyhedral mosaic layup was used to characterise the randomly distributed polycrystalline structure inside the coal rock. The DEM model parameters were subsequently calibrated on the basis of the results of static and dynamic rock mechanical tests inside the coal rock as a benchmark. The results show that the Voronoi mesh can satisfactorily simulate the shear zone caused by shear misalignment under compressive loading and crack extension under tensile loading. Additionally, the dynamic increase factors (DIFs) of the coal rock were 1.21, 2.02, 3.87 and 3.97 at impact velocities of 3 m/s, 5 m/s, 7 m/s and 9 m/s, respectively, and the mechanical properties and fracture behaviour of the coal rock showed rate-dependent effects. Finally, numerical simulation experiments on the dynamic damage of coal rock under different influencing factors were carried out. The differences in damage behaviours between the indoor experiments and the numerical simulations of the coal rock were compared to verify the effectiveness of the proposed method. This study provides a reliable means for studying the dynamic damage of coal rock.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121101"},"PeriodicalIF":4.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942763","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

Hydrodynamics of heterogeneous particle swarms in gas-liquid-solid stirred tanks with free surface studied by DEM-VOF 用DEM-VOF研究了自由表面气液固搅拌槽内非均质粒子群的流体动力学

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-10 DOI: 10.1016/j.powtec.2025.121103

Dianyu E , Yingming Wen , Yiliu Wu , Jing Li , Weifu Sun , Yonggang Liu , Chao Chen , Jiaxin Cui , Yinxuan Qiu

{"title":"Hydrodynamics of heterogeneous particle swarms in gas-liquid-solid stirred tanks with free surface studied by DEM-VOF","authors":"Dianyu E , Yingming Wen , Yiliu Wu , Jing Li , Weifu Sun , Yonggang Liu , Chao Chen , Jiaxin Cui , Yinxuan Qiu","doi":"10.1016/j.powtec.2025.121103","DOIUrl":"10.1016/j.powtec.2025.121103","url":null,"abstract":"<div><div>Stirred tanks play a pivotal role in material blending, yet there is still a lack of data on inner complex blending mechanism, especially involving heterogeneous particle swarm with different shape combinations. This study extensively develops the DEM-VOF model, in which different drag force models are applied based on the identification of particle shapes. It aims to provide an insight into the blending system dynamics of heterogeneous particle swarms through seven arranged particle schemes building upon three different shapes. The results show that the oblate-prolate ellipsoid particle scheme has the optimal suspension performance, but demonstrates high power consumption. The addition of spherical particles into the oblate-prolate ellipsoid particle scheme has significant effect on particle suspension, fluid flow and the evolution of free surface, while contributes to a reduction in power consumption. This study presents an analysis of the hydrodynamics and optimization of blending systems involving heterogeneous particle swarms in stirred tanks.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"462 ","pages":"Article 121103"},"PeriodicalIF":4.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144089706","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

Numerical and experimental study to reduce powder segregation in directed energy deposition using ultrasonic vibration AlSi10Mg/Cu powder feeding 超声振动喂入AlSi10Mg/Cu粉末减少定向能沉积中粉末偏析的数值与实验研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-10 DOI: 10.1016/j.powtec.2025.121102

Anqi Wang , Ping Zou , Bingya Li , Yafei Zhang , Jilin Xu

{"title":"Numerical and experimental study to reduce powder segregation in directed energy deposition using ultrasonic vibration AlSi10Mg/Cu powder feeding","authors":"Anqi Wang , Ping Zou , Bingya Li , Yafei Zhang , Jilin Xu","doi":"10.1016/j.powtec.2025.121102","DOIUrl":"10.1016/j.powtec.2025.121102","url":null,"abstract":"<div><div>One of the primary challenges in multi-material laser directed energy deposition is the segregation of powder during the powder feeding process. This occurs due to significant differences in the inertia characteristics of the powder, resulting in a deviation in elemental composition between the deposited layer and the pre-mixed powder. In this study, the ultrasonic vibration powder feeding method is utilized to feed AlSi10Mg/Cu mixed powder with a density difference of 3.3 times. The effects of different vibration parameters and powder characteristics on the powder flow concentration are investigated. Considering air resistance, the powder collision numerical model is developed and calibrated, which can accurately simulate the diffusion and suspension of particles. The impacts of particle dynamic behavior inside and outside the tube on powder dispersion are discussed respectively. The universality of the model is verified. The results indicate that amplitude and particle size range greatly influence powder concentration, while material density has minimal impact. Through parameter optimization, the uniformity of deposited layers formed by ultrasonic vibration multi-material powder feeding is greatly improved. The elemental proportion is basically consistent with that of pre-mixed power, with an error rate as low as 1.8 %. This study successfully reduces element segregation for additive manufacturing of composite materials.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121102"},"PeriodicalIF":4.5,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942760","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

Thermal enhanced porous media for the efficient partial oxidation of methane to produce hydrogen-rich syngas: Effects of heat conductive parameter and packed bed structure 甲烷部分高效氧化生成富氢合成气的热增强多孔介质：导热参数和填料床结构的影响

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-09 DOI: 10.1016/j.powtec.2025.121107

Huaming Dai, Zhuoyu Li, Xinyi Wang, Xiaojie Gao

{"title":"Thermal enhanced porous media for the efficient partial oxidation of methane to produce hydrogen-rich syngas: Effects of heat conductive parameter and packed bed structure","authors":"Huaming Dai, Zhuoyu Li, Xinyi Wang, Xiaojie Gao","doi":"10.1016/j.powtec.2025.121107","DOIUrl":"10.1016/j.powtec.2025.121107","url":null,"abstract":"<div><div>Partial oxidation of methane in a porous media burner contributed to emission reduction and clean energy conversion. In order to improve the methane conversion efficiency and hydrogen yield, a device combining heat conductive solid and inert Al<sub>2</sub>O<sub>3</sub> pellets was proposed. And the combustion characteristics and product concentration under different heat conductive structures were studied and compared with conventional burners. The results demonstrated that with the increasing of heat conductive rod diameter, the combustion temperature increased and the syngas yield achieved the highest value at <em>d</em> = 8 mm. And the maximum yields of H<sub>2</sub> and CO were also reached when the length of the heat conductive rod was 80 mm and <em>d</em> = 8 mm, which were 48.9 % and 68.0 %, respectively. Due to the dual effects of wall quenching and thermal conductivity, the peak temperature and methane reforming efficiency increased first and then decreased with the increasing of rod number. And the maximum reforming efficiency of 53.4 % was obtained when an 8–80 heat conductive rod was utilized. Heat conductive solids with suitable structures and packed pellets realized the optimal coupling with porous media, which provided a new theoretical guidance for efficient hydrogen production by partial oxidation of methane.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121107"},"PeriodicalIF":4.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942761","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

Preparation of porous CL-20/FOX-7@AP composite microspheres to enhance safety and energy release efficiency 制备多孔CL-20/FOX-7@AP复合微球以提高安全性和能量释放效率

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-09 DOI: 10.1016/j.powtec.2025.121108

Wenqing Li, Shimin Zhang, Songchao Shi, Xin Ruan, Qian Yang, Baoyun Ye, Chongwei An, Jingyu Wang

{"title":"Preparation of porous CL-20/FOX-7@AP composite microspheres to enhance safety and energy release efficiency","authors":"Wenqing Li, Shimin Zhang, Songchao Shi, Xin Ruan, Qian Yang, Baoyun Ye, Chongwei An, Jingyu Wang","doi":"10.1016/j.powtec.2025.121108","DOIUrl":"10.1016/j.powtec.2025.121108","url":null,"abstract":"<div><div>The proportion of oxidizer in the formulation of composite solid propellants (CSPs) is often more than 50 %. It is very important to explore the preparation of new high-energy oxidizers to improve the energy performance of CSPs. Porous CL-20/FOX-7@AP composite microspheres were prepared by combining high-energy density CL-20 and high safety FOX-7 with traditional oxidant AP through microchannel recrystallization technology coupled with solvent evaporation induced self-assembly technology. The experimental results show that the morphology of porous CL-20/FOX-7@AP composite microspheres is regular, and AP is uniformly attached to the surface of porous CL-20/FOX-7 composite microspheres. Compared with CL-20/FOX-7 composite microspheres, the oxygen balance of CL-20/FOX-7@AP increased from −14.12 % to −8.47 %, and the minimum impact excitation energy of CL-20/FOX-7@AP-1 and CL-20/FOX-7@AP-2 increased by 2.25 J and 3.25 J, respectively. When CL-20/FOX-7@AP-1 and CL-20/FOX-7@ AP-2 were used as new oxidants to replace 10 % AP in CSPs formula, the burning rate increased by 21.52 % and 27.85 % respectively, and the pressurization rate increased by 69.79 % and 75.44 % respectively. CL-20/FOX-7@AP composite microspheres with a porous synergistic core-shell structure are expected to be used as novel high-energy oxidants in CSPs to improve the energy density and energy release efficiency of CSPs.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121108"},"PeriodicalIF":4.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937279","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

3D particle shape estimation without pre-training or prior models

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-09 DOI: 10.1016/j.powtec.2025.121109

Takao Ueda

{"title":"3D particle shape estimation without pre-training or prior models","authors":"Takao Ueda","doi":"10.1016/j.powtec.2025.121109","DOIUrl":"10.1016/j.powtec.2025.121109","url":null,"abstract":"<div><div>The shapes of particles of many raw, granular materials used in mining and industrial processes impact their physical and chemical properties. These shapes are often determined using two-dimensional (2D) methods such as dynamic image analysis, but such methods can introduce errors because of stereological bias that generate inaccuracies in the resultant three-dimensional (3D) shapes. In this study, a method designated BITRIC was developed to estimate 3D shapes from easily measurable 2D shapes without the need for pre-training or prior models. Our method involves two steps: 3D shapes reflecting the characteristics of the measured 2D shapes are generated using a Fourier shape descriptor, and 3D shapes are created using spherical harmonic–based principal component analysis such that their 2D projected images closely approximate the observed 2D shapes. The estimated accuracy of this method was more than fivefold better than that of the traditional approach using only a Fourier shape descriptor. Because this method does not require pre-training or other preparatory steps, it can be applied to particles for which there are no existing data. For demonstration purposes, the method was used to estimate the 3D shapes of rocks on the surface of Mars using photographs of the Martian surface taken by the Perseverance rover.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121109"},"PeriodicalIF":4.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942762","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

Experimental study on sound field characteristics of circular and elliptic cyclone separators 圆形和椭圆形旋风分离器声场特性的实验研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-09 DOI: 10.1016/j.powtec.2025.121093

Kaixuan Zhang, Kangshuo Li, Zhanpeng Sun, Haipeng Yan, Qingsong Song, Zhaohua Zhi

{"title":"Experimental study on sound field characteristics of circular and elliptic cyclone separators","authors":"Kaixuan Zhang, Kangshuo Li, Zhanpeng Sun, Haipeng Yan, Qingsong Song, Zhaohua Zhi","doi":"10.1016/j.powtec.2025.121093","DOIUrl":"10.1016/j.powtec.2025.121093","url":null,"abstract":"<div><div>Traditional flow field measurement techniques for cyclone separators suffer from issues such as high cost, complex operation, and environmental limitations. In this research, an innovative method of indirectly detecting the flow field of a cyclone using acoustic signals was proposed, and the acoustic field characteristics of the circular and elliptic cyclones were analyzed. The influences of sampling angles, cross-sections, and inlet velocities on the acoustic signals were systematically investigated. The results indicate that the sound pressure at different angles inside the elliptic cyclone varies significantly. The maximum fluctuation amplitude is approximately 33 times that of the circular cyclone. Its point-average sound pressure level exhibits periodic increases and decreases, and the surface-average sound pressure level is relatively low due to the weak swirling intensity. Frequency analysis shows that there are significant differences in the fundamental frequency distribution across different sampling cross-sections. The fundamental frequency of the cylinder is concentrated in 55–85 Hz, and the fundamental frequency distribution of the cone can reach 50–280 Hz. Notably, the fundamental frequency at the cone is extremely sensitive to the inlet velocity. Based on the research findings, a prediction equation for the maximum tangential velocity of the cyclone is successfully established using the point-average sound pressure level data, which explores a new path for the flow analysis of cyclones.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121093"},"PeriodicalIF":4.5,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937281","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

Force chain generation and evaluation of granular materials based on discrete element simulation and generative adversarial network 基于离散元模拟和生成对抗网络的颗粒物料力链生成与评估

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-08 DOI: 10.1016/j.powtec.2025.121100

Kaixuan Ju , Tingting Zhao , Yuting Luo , Xiaomin Ma , Jiaying Liu , Yuntian Feng , Zhihua Wang

{"title":"Force chain generation and evaluation of granular materials based on discrete element simulation and generative adversarial network","authors":"Kaixuan Ju , Tingting Zhao , Yuting Luo , Xiaomin Ma , Jiaying Liu , Yuntian Feng , Zhihua Wang","doi":"10.1016/j.powtec.2025.121100","DOIUrl":"10.1016/j.powtec.2025.121100","url":null,"abstract":"<div><div>The macroscopic mechanical properties of granular systems largely depend on the complex mechanical responses of force chains at the mesoscopic level. This study offers an alternative to rapidly identify and predict force chain distributions under different stress states. 100 sets of gradation curves that effectively represent four typical continuous gradation distributions are constructed. Numerical specimens corresponding to these gradation curves are generated using the discrete element method (DEM), and a dataset for deep neural network training is established via biaxial compression numerical simulations. The relationship between particle distribution characteristics and force chain structure is captured by the Pix2Pix conditional generative adversarial network (cGAN). The effectiveness of the generated force chain images in reproducing both particle gradation and spatial distribution characteristics is verified through the extraction and analysis of pixel probability distributions across different color channels, along with the computation of texture feature metrics. In addition, a GoogLeNet-based prediction model is constructed to demonstrate the accuracy with which the generated force chain images characterize the macroscopic mechanical properties of granular assemblies. The results indicate that the Pix2Pix network effectively predicts and identifies force chain distributions at peak stress for different gradation distributions, with the generated images exhibiting a high degree of consistency in gradation, spatial distribution, and macroscopic mechanical performance.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121100"},"PeriodicalIF":4.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942764","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

Research on the spheroidization performance and mechanism of TiC particle-reinforced powders TiC颗粒增强粉末球化性能及机理研究

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-08 DOI: 10.1016/j.powtec.2025.121104

Pengyu Liu , Ruihua Zhang , Hui Li , Mengzhi Xiao , Yan Yin , Chao Lu , Yicheng Yang , Cunliang Pan , Haiqiang Bai , Qiao Qiu , Shanchao Zuo

{"title":"Research on the spheroidization performance and mechanism of TiC particle-reinforced powders","authors":"Pengyu Liu , Ruihua Zhang , Hui Li , Mengzhi Xiao , Yan Yin , Chao Lu , Yicheng Yang , Cunliang Pan , Haiqiang Bai , Qiao Qiu , Shanchao Zuo","doi":"10.1016/j.powtec.2025.121104","DOIUrl":"10.1016/j.powtec.2025.121104","url":null,"abstract":"<div><div>The irregular TiC particle-reinforced powder was spheroidized using radio-frequency plasma spheroidization technology. The phase, particle size distribution, fluidity, tap density, loose density, powder surface morphology and internal microstructure of the powder were studied by means of X- ray diffraction, scanning electron microscopy, transmission electron microscopy, powder particle size tester, and density tester. Moreover, the powder feeding process and melting state of the spheroidized powder were analyzed. The results show that: The phases of the powder before and after spheroidization are composed of TiC, austenite, and ferrite. The properties such as the fluidity, loose density, tap density, and angle of repose of the powder have all been improved, and the median particle size has decreased. The surface morphology of the spheroidized powder mainly presents five forms: spherical, ellipsoidal, rod - shaped, satellite-shaped, and irregular powder. Except for the irregular-shaped powder, a “crater” structure appears on the surface of other powders. The dislocations inside the TiC in the “crater” surface layer are mostly mixed dislocations. TiC shows a good interfacial relationship with ferrite and austenite. The strain field on the left side of the interface between TiC and ferrite is mainly compressive strain, and the sizes of the compressive-strain and tensile-strain regions on the left side of the interface between TiC and austenite are similar.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121104"},"PeriodicalIF":4.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937280","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

Numerical investigation of hydrodynamics in porous media of two-dimensional rod packings: Flow regimes from pre-Darcy to post-Darcy 二维杆状填料多孔介质中流体力学的数值研究：达西前到达西后的流动状态

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-05-08 DOI: 10.1016/j.powtec.2025.121105

L.W. Rong , K.J. Dong , S. Wang

{"title":"Numerical investigation of hydrodynamics in porous media of two-dimensional rod packings: Flow regimes from pre-Darcy to post-Darcy","authors":"L.W. Rong , K.J. Dong , S. Wang","doi":"10.1016/j.powtec.2025.121105","DOIUrl":"10.1016/j.powtec.2025.121105","url":null,"abstract":"<div><div>Fluid flow through porous media of two-dimensional rod packings is studied by an approach that combines direct numerical simulation and techniques of Cartesian cut-cell and dynamic grid adaptation. The rod packings are generated from simulations using the discrete element method and have a wide range of porosity. The approach is comprehensively validated and then used to study the effect of porosity on the internal fluid flow and the hydrodynamics. Inertial flow structures are identified and related to local pore geometries. For the first time in direct numerical simulations, it is found the linear Darcy's law has both upper and lower limits of applicable Reynolds number. Based on the simulated data, a new equation spanning different flow regimes is formulated to calculate the friction factor. In terms of a Darcy-permeability-based characteristic length, the pressure drop of rod packings with different porosities can be unified. The directional permeability analysis demonstrates significant flow-orientation dependence in dense or sparse packings due to structural heterogeneity. The analysis of the forces acting on individual rods suggests that local non-uniformity of the packing structures may be related to the occurrence of pre-Darcy regime in rod packings.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"461 ","pages":"Article 121105"},"PeriodicalIF":4.5,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942765","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