Granular Matter最新文献

Reducing segregation in vibrated binary-sized granular mixtures by excessive small particle introduction 通过过度引入小颗粒减少振动双元粒状混合物中的偏析现象

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-20 DOI: 10.1007/s10035-024-01476-6

Fumiaki Nakai, Kiwamu Yoshii

{"title":"Reducing segregation in vibrated binary-sized granular mixtures by excessive small particle introduction","authors":"Fumiaki Nakai, Kiwamu Yoshii","doi":"10.1007/s10035-024-01476-6","DOIUrl":"10.1007/s10035-024-01476-6","url":null,"abstract":"<div><p>We numerically examine binary-sized granular mixtures confined between two parallel walls subjected to vertical vibration using the discrete element method. For a size ratio of 3 between large and small particles, we study the structure of large particles in moderately dense regimes where the combined two-dimensional packing fractions of both particle sizes exceed 1. When the fraction of small particles is small, segregation of the large particles occurs. In contrast, as the fraction of small particles increases, an effective repulsion between the large particles emerges over distances greater than the large particle diameter, suppressing their segregation. The emergence of reduction in segregation is confirmed for another size ratio, vibrational acceleration, system size, and for a case of bidisperse size distribution. Additionally, at the size ratio of 3, the effective repulsion induces a hexagonal phase of the large particles at packing fractions lower than in mono-component systems. This work will provide a fresh insight into granular physics, prompting further experimental and theoretical study.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>This article numerically investigates the structures of quasi-two-dimensional binary-sized granular mixtures under vibration, and finds that segregation is reduced with increasing packing fraction of small particles</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01476-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thermal conductivity and shrinkage characteristics of bentonite-fly ash and bentonite-sand backfill material 膨润土-粉煤灰和膨润土-砂回填材料的导热性和收缩特性

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-19 DOI: 10.1007/s10035-024-01482-8

Pawan Kishor Sah, Shiv Shankar Kumar

{"title":"Thermal conductivity and shrinkage characteristics of bentonite-fly ash and bentonite-sand backfill material","authors":"Pawan Kishor Sah, Shiv Shankar Kumar","doi":"10.1007/s10035-024-01482-8","DOIUrl":"10.1007/s10035-024-01482-8","url":null,"abstract":"<div><p>Thermal backfill is an integrated part of underground electrical cable infrastructures systems, ground heat source pumps and radioactive waste repositories, as it minimizes resistance to heat transfer away from these systems. The heat transfer capacity and current carrying capability of underground electrical cables are significantly affected by thermal conductivity of backfill material and the surrounding soil media. Therefore, this research paper compares the thermal conductivity and shrinkage results of compacted (low to high densities) fly ash- and sand-bentonite mixtures with bentonite contents of 30%, 50%, 60%, 80% and 100%. The thermal conductivity of mixtures increased from 1.05 Wm<sup>−1</sup>K<sup>−1</sup> to 1.20 Wm<sup>−1</sup>K<sup>−1</sup> with the addition of fly ash content from 20 to 70% by weight in bentonite. The thermal conductivity bentonite-sand mixture was also found to be increased from 1.21 Wm<sup>−1</sup>K<sup>−1</sup> to 1.83 Wm<sup>−1</sup>K<sup>−1</sup> with increasing sand content. Additional to this, the bentonite-sand and bentonite-fly ash-based backfill materials surrounding heat-sensitive structures experience shrinkage and desiccation cracking due to thermal drying. Therefore, the desiccation volumetric shrinkage tests of bentonite-sand and bentonite-fly ash mixtures were conducted and found that the presence of sand or fly ash reduces shrinkage strain. Based on the experimental results, this study suggests a sustainable utilization of fly ash up to 50%-70% as an effective thermal backfill material in electrical cable infrastructure systems. Thus, the application of fly ash as a construction material reduces environmental impact and cost, aligning with the goals of sustainable development.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 studies on fluctuation properties of dust, turbulence and electric field during floating dust weather in Lanzhou 兰州浮尘天气中尘埃、湍流和电场波动特性的试验研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-15 DOI: 10.1007/s10035-024-01481-9

Tian-sheng Liu, Tian-Li Bo

{"title":"Experimental studies on fluctuation properties of dust, turbulence and electric field during floating dust weather in Lanzhou","authors":"Tian-sheng Liu, Tian-Li Bo","doi":"10.1007/s10035-024-01481-9","DOIUrl":"10.1007/s10035-024-01481-9","url":null,"abstract":"<div><p>In this paper, real-time measurements of three-dimensional wind speed, electric field and dust concentration during the floating-dust event were carried out in Lanzhou. The scaling relationship of different physical quantities in spectral space and the effect of turbulent events on dust and heat transport are studied by spectral method and octant analysis method. Our results show that the logarithmic value of power spectrum of dust concentration, relative humidity (<i>RH</i>), streamwise and vertical wind speed (<i>u</i> and <i>w</i>) between 0.06 Hz and 0.435 Hz meets the linear relationship with the logarithmic value of frequency (<i>f</i>), and decreases with the logarithmic value of <i>f</i>. For different stages, in the frequency range from 0.06 Hz to 0.218 Hz, the slope of the <i>u</i> first increases and then decreases. The slope of dust concentration and <i>RH</i> did not change significantly in the development stage, but decreased in the decay stage. The slope of the temperature (<i>T</i>) first decreases and then increases. In the frequency range from 0.218 Hz to 0.435 Hz, the slope of <i>u</i> and <i>RH</i> first increase and then decrease. The slope of the dust concentration does not change significantly during the development stage and decreases in the decay stage. The slope of <i>w</i> first increases and then decreases. In the second stage, the contribution of ejection and sweep events to the turbulent motion increases. For dust and heat transport, the O<sub>5</sub> and O<sub>8</sub> have a larger number contribution. Although the number and intensity contribution ratio of all octants increased or decreased in the second and third stages, in terms of the intensity of a single event, the contribution of all octants to the dust and heat transport increased.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Prediction of liquid bridge rupture between two plates combining artificial neural network with grey wolf optimization algorithm 人工神经网络与灰狼优化算法相结合的双板间液桥断裂预测

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-11 DOI: 10.1007/s10035-024-01479-3

Zenghua Fan, Congcong Huang, Jun Gao, Kun Zhang, Zhi Xu, Ming Fan

{"title":"Prediction of liquid bridge rupture between two plates combining artificial neural network with grey wolf optimization algorithm","authors":"Zenghua Fan, Congcong Huang, Jun Gao, Kun Zhang, Zhi Xu, Ming Fan","doi":"10.1007/s10035-024-01479-3","DOIUrl":"10.1007/s10035-024-01479-3","url":null,"abstract":"<div><p>The liquid bridge rupture has attracted much attention in various fields such as powder technology, micro gripping, and wet agglomeration. In present study, an artificial neural network (ANN) model was developed to predict the liquid bridge rupture between two plates, focusing on the rupture distance and the transfer ratio. The initial weights and biases of the ANN model were optimized by the grey wolf optimization algorithm (GWO). The GWO-ANN model prediction is compared with the BP-ANN model prediction. Based on the testing dataset, the mean square error (<i>MSE</i>) and correlation coefficient (<i>R</i><sup>2</sup>) of the rupture distance for the optimized GWO-ANN model were calculated as 4.65 × 10<sup>− 4</sup> and 0.9586, and that of the transfer ratio was 2.15 × 10<sup>− 4</sup> and 0.975, respectively. The effectiveness of the constructed GWO-ANN model for the liquid bridge rupture prediction was verified by experimental investigations. The effect of input parameters including contact angles, stretching speed, liquid volume and liquid viscosity on the rupture was discussed in detail.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Construction of granular aggregates with different porosity, shape, and size distributions 制造具有不同孔隙率、形状和粒度分布的颗粒集料

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-09 DOI: 10.1007/s10035-024-01477-5

Emmanuel N. Millán, M. Belén Planes, Eduardo M. Bringa, M. Gabriela Parisi

{"title":"Construction of granular aggregates with different porosity, shape, and size distributions","authors":"Emmanuel N. Millán, M. Belén Planes, Eduardo M. Bringa, M. Gabriela Parisi","doi":"10.1007/s10035-024-01477-5","DOIUrl":"10.1007/s10035-024-01477-5","url":null,"abstract":"<p>Granular matter is characterized by a collection of grains, where the collective behavior relies on interactions among all constituent particles, generally including both cohesive and dissipative interactions. Understanding and predicting granular behavior is pivotal for both basic science and technological applications, ranging from astrophysics to geology, cereal storage, and cosmetics development. The structure of these aggregates varies depending on the environment but often involves a highly porous configuration. In this study, we introduce our AGregate GENeration Tool (AGGENT) specifically designed for constructing granular aggregates with varying levels of porosity, shapes, and grain sizes. The software facilitates aggregate generation using JKR or DMT cohesive models with a finite grain overlap, enabling the achievement of highly homogeneous aggregates. The behavior of porosity of the generated samples near surfaces is also discussed. These generated samples can subsequently be utilized for performing various simulations, allowing for further analysis of granular behavior under different conditions of interest, including transport, mechanical and thermal properties, etc.</p>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Macroscopic effects of intraparticle fracture, grain topology and shape on vehicle dynamics and mobility over gravel road beds 颗粒内断裂、颗粒拓扑结构和形状对车辆在砾石路面上的动力学和流动性的宏观影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-07 DOI: 10.1007/s10035-024-01469-5

Debdeep Bhattacharya, Robert Lipton

引用次数: 0

Fluid-soil interaction analysis for jet grouting in sands based on numerical simulation 基于数值模拟的砂中喷射灌浆的流体-土壤相互作用分析

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-06 DOI: 10.1007/s10035-024-01480-w

Kai Wang, Zhao-Ping Li, Hao Zheng, Qing-Bo Li

{"title":"Fluid-soil interaction analysis for jet grouting in sands based on numerical simulation","authors":"Kai Wang, Zhao-Ping Li, Hao Zheng, Qing-Bo Li","doi":"10.1007/s10035-024-01480-w","DOIUrl":"10.1007/s10035-024-01480-w","url":null,"abstract":"<div><p>Jet grouting is a geotechnical consolidation technique commonly used to improve soil mechanicals. Despite its successful applications, understanding micro-level interactions between the jet and soil is incomplete. This paper utilizes the Smoothed Particle Hydrodynamics (SPH) and Arbitrary Lagrangian-Eulerian (ALE) methods to simulate fluid-soil interactions in both non-submerged and submerged environments. Analysis covers the flow fields and soil erosion. Findings show erosion velocity remains steady in non-submerged conditions, with the jet compacting and flushing soil. In submerged conditions, the simulated jet flow field under soil constraint is similar to that in the free submerged conditions. However, influenced by soil deformation, damage, and the backflow of the slurry, the jet flow field under soil constraint displays distinct features. For instance, velocity distributions in certain cross-sections cannot be accurately described by normal distribution, and axial velocity distribution curves exhibit different partitions compared to free submerged jet theory. Comparative simulations vary jet pressures, grout water-cement ratios, and soil compactness to analyze the erosion process. It is found that jet pressure significantly affects the depth of the erosion pit. The limit erosion distance in ALE simulations were compared with theoretical values derived from an established theory, and a model experiment was also conducted to analyze the jet-grouted diameter at different left speeds and rotational speeds of rod. The results show that ALE method can offer high accuracy in predicting the jet-grouted diameter and proves to be a feasible approach for fluid-soil interaction simulations in jet grouting.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Enhanced interlocking in granular jamming grippers through hard and soft particle mixtures 通过软硬颗粒混合物增强颗粒干扰抓取器的互锁性

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-10-30 DOI: 10.1007/s10035-024-01475-7

Angel Santarossa, Thorsten Pöschel

引用次数: 0

Determination of discrete element method (DEM) simulation parameters for polymeric waste particles 离散元素法（DEM）聚合物废物颗粒模拟参数的确定

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-10-21 DOI: 10.1007/s10035-024-01474-8

Alessio Martignoni, Lorenzo Iorio, Matteo Strano

{"title":"Determination of discrete element method (DEM) simulation parameters for polymeric waste particles","authors":"Alessio Martignoni, Lorenzo Iorio, Matteo Strano","doi":"10.1007/s10035-024-01474-8","DOIUrl":"10.1007/s10035-024-01474-8","url":null,"abstract":"<div><p>Plastic consumption is on the rise, particularly in Europe, where million tonnes are produced each year, with only 10% recovered. Optimizing the recycling processes in all its phases is vital. Understanding particle movement in some components of the plastic recycling plants can be addressed by the Discrete Element Method (DEM). The characterization of DEM materials is often performed through the study of the angle of repose (AoR). This study aims to advance DEM simulation of shredded polymeric waste, proposing a scaling and calibration procedure of the relevant simulation parameters. A total of six distinct types of polymeric particles, with different shape and size, have been characterized in this study, measuring their density, their shape estimators, their size distribution and their angle of repose. The AoR has been measured through a hollow cylinder lifting test. First, sensitivity analyses have been performed to establish a suitable range for the numerical parameters and to reduce the dimensionality of the problem. Then, the scaling and calibration procedure is described and tested on the six batches. The proposed procedure allows to predict very well the AoR, with an error below 1%, and the other geometrical variables of a heap, although it deteriorates in fully predicting its shape when the sphericity of the particles decreases.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 simulation of gas penetration and powder compression during high-pressure dynamic load in silo 筒仓高压动态负载期间气体渗透和粉末压缩的数值模拟

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-10-17 DOI: 10.1007/s10035-024-01471-x

Minghao You, Xin Wang, Xiaofei Mao, Xuanyi Liu, Xuewen Zeng, Cai Liang, Jiliang Ma, Xiaoping Chen

{"title":"Numerical simulation of gas penetration and powder compression during high-pressure dynamic load in silo","authors":"Minghao You, Xin Wang, Xiaofei Mao, Xuanyi Liu, Xuewen Zeng, Cai Liang, Jiliang Ma, Xiaoping Chen","doi":"10.1007/s10035-024-01471-x","DOIUrl":"10.1007/s10035-024-01471-x","url":null,"abstract":"<div><p>The powder consolidation and equipment damage caused by frequent pressurization of the lock hopper silo seriously affect stable powder discharge and transportation. This paper investigated the powder compression and gas permeation characteristics during the silo pressurization by experiment and simulation. The spherical glass powder and irregularly shaped coal powder were selected as the granular materials. The modified drag model agrees well with the experiments for spatial pressure cumulative distribution and full-process pressure drop. The coal powder has a higher average compression ratio than the glass powder. The local porosity of the powder layer experiences two stages of rapid decrease and slow stabilization. The powder compression arises from particle rearrangement and bed pore structure reconstruction under airflow disturbance. The nonlinear growth of pressure accumulation curves at different spatial points in the early stage of silo pressurization forms a fusiform envelope surface. As the average pressure-increasing rate increases, the peak gas pressure gradient of the powder layer increases approximately linearly. The penetration time difference of glass powder between powder layers I and V is less than 1 s, while that of coal powder is close to 4 s. There was a significant time hysteresis effect for gas penetration in the coal powder silo.</p><h3>Graphic abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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