{"title":"基于 X 射线计算机断层扫描和 CFD-DEM 数值模拟的珊瑚礁石灰岩泥浆渗透研究","authors":"Jiahe Bai , Xin Huang , Yun Li , Qinghua Lei","doi":"10.1016/j.powtec.2024.119972","DOIUrl":null,"url":null,"abstract":"<div><p>Coral reef limestone is a highly fossiliferous and porous sedimentary rock, ubiquitous in continental shelves and deep oceanic zones. To understand the slurry infiltration process from a microscopic perspective, we use X-ray computed tomography (CT) to reconstruct the complex three-dimensional pore structures of a coral reef limestone sample and further perform CFD-DEM simulations to capture the transport behavior of slurry particles passing through the reef limestone skeleton. The simulation results show that the kinetic energy of slurry particles in general follows a linear relationship with the applied pressure differential, which is influenced by the physical characteristics of pore channels. The particle infiltration time is inversely correlated to the pressure differential obeying a power-law function. In addition, statistical analysis of the length and spatial distribution of particle trajectories indicates the dominant role of high-coordination-number pore spaces in slurry suspension infiltration through the reef limestone. Our results have important implications for slurry shield tunneling through coral reef limestone strata.</p></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.5000,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigating slurry infiltration in a coral reef limestone based on X-ray computed tomography and CFD-DEM numerical simulation\",\"authors\":\"Jiahe Bai , Xin Huang , Yun Li , Qinghua Lei\",\"doi\":\"10.1016/j.powtec.2024.119972\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Coral reef limestone is a highly fossiliferous and porous sedimentary rock, ubiquitous in continental shelves and deep oceanic zones. To understand the slurry infiltration process from a microscopic perspective, we use X-ray computed tomography (CT) to reconstruct the complex three-dimensional pore structures of a coral reef limestone sample and further perform CFD-DEM simulations to capture the transport behavior of slurry particles passing through the reef limestone skeleton. The simulation results show that the kinetic energy of slurry particles in general follows a linear relationship with the applied pressure differential, which is influenced by the physical characteristics of pore channels. The particle infiltration time is inversely correlated to the pressure differential obeying a power-law function. In addition, statistical analysis of the length and spatial distribution of particle trajectories indicates the dominant role of high-coordination-number pore spaces in slurry suspension infiltration through the reef limestone. Our results have important implications for slurry shield tunneling through coral reef limestone strata.</p></div>\",\"PeriodicalId\":407,\"journal\":{\"name\":\"Powder Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.5000,\"publicationDate\":\"2024-06-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Powder Technology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0032591024006156\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591024006156","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
摘要
珊瑚礁石灰岩是一种化石含量高且多孔的沉积岩,在大陆架和深海区域无处不在。为了从微观角度了解泥浆的渗透过程,我们利用 X 射线计算机断层扫描(CT)重建了珊瑚礁石灰岩样本的复杂三维孔隙结构,并进一步进行 CFD-DEM 模拟,以捕捉泥浆颗粒穿过珊瑚礁石灰岩骨架时的输运行为。模拟结果表明,泥浆颗粒的动能一般与外加压差呈线性关系,这受到孔隙通道物理特性的影响。颗粒渗透时间与压差成反比,服从幂律函数。此外,对颗粒轨迹长度和空间分布的统计分析表明,高配合数孔隙在泥浆悬浮液渗入暗礁石灰岩过程中起主导作用。我们的研究结果对泥浆护盾穿越珊瑚礁石灰岩地层具有重要意义。
Investigating slurry infiltration in a coral reef limestone based on X-ray computed tomography and CFD-DEM numerical simulation
Coral reef limestone is a highly fossiliferous and porous sedimentary rock, ubiquitous in continental shelves and deep oceanic zones. To understand the slurry infiltration process from a microscopic perspective, we use X-ray computed tomography (CT) to reconstruct the complex three-dimensional pore structures of a coral reef limestone sample and further perform CFD-DEM simulations to capture the transport behavior of slurry particles passing through the reef limestone skeleton. The simulation results show that the kinetic energy of slurry particles in general follows a linear relationship with the applied pressure differential, which is influenced by the physical characteristics of pore channels. The particle infiltration time is inversely correlated to the pressure differential obeying a power-law function. In addition, statistical analysis of the length and spatial distribution of particle trajectories indicates the dominant role of high-coordination-number pore spaces in slurry suspension infiltration through the reef limestone. Our results have important implications for slurry shield tunneling through coral reef limestone strata.
期刊介绍:
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.