| A numerical study on the gas fluidisation of secondary agglomerates of nanoparticles |
| |
| 作者姓名： | Yurong HE Huilin LU Dongsheng WEN Yulong DING |
| |
| 作者单位： | 1. Energy Science and Engineering College, Harbin Institute of Technology, Harbin 150001， China； 2. Department of Engineering, Queen Mary University of London, Mile End Road, London, UK E1 4NS； 3. Institute of Particle Science and Engineering, University of Leeds, Leeds, U.K., LS2 9JT |
| |
| 摘 要： | Numerical simulations are performed on the gas fluidization of the secondary agglomerates of SiO2 and SiC nanoparticles. An Eulerian two-fluid approach is used, which models the solids stress modulus with an empirical Jung-Gidaspow relationship and the drag force based on the secondary agglomerates. The results show the behaviour of particulate fluidisation of the secondary agglomerates of nanoparticles. The fluidised bed has a very high expansion ratio but without distinct bubbles. A three-zone distribution of time-averaged particle concentration is observed along the bed height. These are a dense zone in the lower part of the bed, a dilute zone at the top part, and a transitional zone lies in between. The radial distribution of particle concentration is found to be nearly homogeneous in both the dilute and transitional zones. The modelling results are compared with experimental results reported in the literature and reasonably good agreement has been achieved.
|
| 关 键 词： | nanoparticles secondary agglomerates two-fluid model fluidization simulation. |
A numerical study on the gas fluidisation of secondary agglomerates of nanoparticles |
| |
| Yurong HE,Huilin LU,Dongsheng WEN,Yulong DING.A numerical study on the gas fluidisation of secondary agglomerates of nanoparticles[J].Progress in Natural Science,2005,15(13):111-116. |
| |
| Authors: | Yurong HE Huilin LU Dongsheng WEN Yulong DING |
| |
| Abstract: | Numerical simulations are performed on the gas fluidization of the secondary agglomerates of SiO2 and SiC nanoparticles. An Eulerian two-fluid approach is used, which models the solids stress modulus with an empirical Jung-Gidaspow relationship and the drag force based on the secondary agglomerates. The results show the behaviour of particulate fluidisation of the secondary agglomerates of nanoparticles. The fluidised bed has a very high expansion ratio but without distinct bubbles. A three-zone distribution of time-averaged particle concentration is observed along the bed height. These are a dense zone in the lower part of the bed, a dilute zone at the top part, and a transitional zone lies in between. The radial distribution of particle concentration is found to be nearly homogeneous in both the dilute and transitional zones. The modelling results are compared with experimental results reported in the literature and reasonably good agreement has been achieved. |
| |
| Keywords: | nanoparticles secondary agglomerates two-fluid model fluidization simulation |
|
| 点击此处可从《自然科学进展(英文版)》浏览原始摘要信息 |
| 点击此处可从《自然科学进展(英文版)》下载免费的PDF全文 |
