{"title":"倾斜闭顶准二维管道颗粒排水过程中的鼓泡现象","authors":"Ritwik Maiti , Gargi Das , Prasanta Kumar Das","doi":"10.1016/j.partic.2025.05.005","DOIUrl":null,"url":null,"abstract":"<div><div>The study investigates gravity-driven granular drainage from a closed-top quasi-two-dimensional rectangular conduit. Experiments over a wide range of conduit inclination with respect to the horizontal (<em>θ</em>) reveal drainage to occur by “avalanche flow”. Beyond a conduit tilt (<em>θ</em> > <em>θ</em><sub><em>b</em></sub>), avalanching is accompanied by bubbling of the interstitial air, which hastens the rate of drainage. However, on further increase in conduit tilt towards the vertical (<em>θ</em> > <em>θ</em><sub><em>m</em></sub>), the rate of drainage slows down as avalanche flow ceases while bubbling continues. Flow visualization experiments followed by image analysis, spatio-temporal plots, and Digital Particle Image velocimetry (DPIV) measurements provide a detailed qualitative description and quantitative measurements in the two drainage regimes, viz, avalanching with bubbling and drainage after termination of avalanche flow. Based on experimental observations, phenomenological models are proposed for the prediction of critical conduit inclination for the inception of bubbling (<em>θ</em><sub><em>b</em></sub>), and termination of avalanche flow (<em>θ</em><sub><em>m</em></sub>), as well as the bubble rise velocity in the two drainage regimes, i.e. for <em>θ</em><sub><em>b</em></sub>≤ <em>θ</em> ≤<em>θ</em><sub><em>m</em></sub> and <em>θ</em><sub><em>m</em></sub>≤ <em>θ</em> ≤ 90°.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"103 ","pages":"Pages 29-40"},"PeriodicalIF":4.3000,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Bubbling phenomena during granular drainage from an inclined closed-top quasi-two-dimensional conduit\",\"authors\":\"Ritwik Maiti , Gargi Das , Prasanta Kumar Das\",\"doi\":\"10.1016/j.partic.2025.05.005\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The study investigates gravity-driven granular drainage from a closed-top quasi-two-dimensional rectangular conduit. Experiments over a wide range of conduit inclination with respect to the horizontal (<em>θ</em>) reveal drainage to occur by “avalanche flow”. Beyond a conduit tilt (<em>θ</em> > <em>θ</em><sub><em>b</em></sub>), avalanching is accompanied by bubbling of the interstitial air, which hastens the rate of drainage. However, on further increase in conduit tilt towards the vertical (<em>θ</em> > <em>θ</em><sub><em>m</em></sub>), the rate of drainage slows down as avalanche flow ceases while bubbling continues. Flow visualization experiments followed by image analysis, spatio-temporal plots, and Digital Particle Image velocimetry (DPIV) measurements provide a detailed qualitative description and quantitative measurements in the two drainage regimes, viz, avalanching with bubbling and drainage after termination of avalanche flow. Based on experimental observations, phenomenological models are proposed for the prediction of critical conduit inclination for the inception of bubbling (<em>θ</em><sub><em>b</em></sub>), and termination of avalanche flow (<em>θ</em><sub><em>m</em></sub>), as well as the bubble rise velocity in the two drainage regimes, i.e. for <em>θ</em><sub><em>b</em></sub>≤ <em>θ</em> ≤<em>θ</em><sub><em>m</em></sub> and <em>θ</em><sub><em>m</em></sub>≤ <em>θ</em> ≤ 90°.</div></div>\",\"PeriodicalId\":401,\"journal\":{\"name\":\"Particuology\",\"volume\":\"103 \",\"pages\":\"Pages 29-40\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2025-05-22\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Particuology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1674200125001300\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Particuology","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1674200125001300","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Bubbling phenomena during granular drainage from an inclined closed-top quasi-two-dimensional conduit
The study investigates gravity-driven granular drainage from a closed-top quasi-two-dimensional rectangular conduit. Experiments over a wide range of conduit inclination with respect to the horizontal (θ) reveal drainage to occur by “avalanche flow”. Beyond a conduit tilt (θ > θb), avalanching is accompanied by bubbling of the interstitial air, which hastens the rate of drainage. However, on further increase in conduit tilt towards the vertical (θ > θm), the rate of drainage slows down as avalanche flow ceases while bubbling continues. Flow visualization experiments followed by image analysis, spatio-temporal plots, and Digital Particle Image velocimetry (DPIV) measurements provide a detailed qualitative description and quantitative measurements in the two drainage regimes, viz, avalanching with bubbling and drainage after termination of avalanche flow. Based on experimental observations, phenomenological models are proposed for the prediction of critical conduit inclination for the inception of bubbling (θb), and termination of avalanche flow (θm), as well as the bubble rise velocity in the two drainage regimes, i.e. for θb≤ θ ≤θm and θm≤ θ ≤ 90°.
期刊介绍:
The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles.
Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors.
Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology.
Key topics concerning the creation and processing of particulates include:
-Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales
-Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes
-Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc.
-Experimental and computational methods for visualization and analysis of particulate system.
These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.