Extending the bubble-based EMMS model to CFB riser simulations
文献类型：期刊论文
| 作者 | Hong, Kun1,2; Shi, Zhansheng2,3; Ullah, Atta2,4; Wang, Wei2 |
| 刊名 | POWDER TECHNOLOGY
 |
| 出版日期 | 2014-11-01 |
| 卷号 | 266期号:11m页码:424-432 |
| 关键词 | Circulating fluidized bed Multi-scale structure Bubble EMMS Simulation |
| ISSN号 | 0032-5910 |
| 其他题名 | Powder Technol. |
| 中文摘要 | Experiments have shown that various structures (e.g., the streamer, cluster, void and bubble) can be clearly observed in gas-solid fluidized beds. These structures affect the overall behavior of flow, mass/heat transfer and reactions significantly and should be accounted for in simulations of gas-solid flow. For the purpose of riser flow simulation, the structure-based drag model has already been proposed based on the description of meso-scale clusters, and incorporated into the framework of a two-fluid model to calculate the effective drag force. However, there is still no clear agreement about the characterization of clusters, such as the cluster shape, size and orientation. In contrast, it is easier to describe and measure the characteristic size of visible bubbles. Here, we attempt to upgrade the bubble-based EMMS model which was established for bubbling fluidized beds originally, and then extend it to simulations of heterogeneous gas-solid flows in CFB risers. Numerical analysis on this new model reveals that it is capable of predicting two turning points, where the flow state is transforming rapidly from uniform to heterogeneous distribution. The predicted voidage in the dense phase is qualitatively consistent with experimental data in the literature. To evaluate this new drag, finally, CFB riser simulations have been carried out by coupling of the two-fluid model and the bubble-based EMMS drag. The results show good agreement with experimental data. (C) 2014 Elsevier B.V. All rights reserved. |
| 英文摘要 | Experiments have shown that various structures (e.g., the streamer, cluster, void and bubble) can be clearly observed in gas-solid fluidized beds. These structures affect the overall behavior of flow, mass/heat transfer and reactions significantly and should be accounted for in simulations of gas-solid flow. For the purpose of riser flow simulation, the structure-based drag model has already been proposed based on the description of meso-scale clusters, and incorporated into the framework of a two-fluid model to calculate the effective drag force. However, there is still no clear agreement about the characterization of clusters, such as the cluster shape, size and orientation. In contrast, it is easier to describe and measure the characteristic size of visible bubbles. Here, we attempt to upgrade the bubble-based EMMS model which was established for bubbling fluidized beds originally, and then extend it to simulations of heterogeneous gas-solid flows in CFB risers. Numerical analysis on this new model reveals that it is capable of predicting two turning points, where the flow state is transforming rapidly from uniform to heterogeneous distribution. The predicted voidage in the dense phase is qualitatively consistent with experimental data in the literature. To evaluate this new drag, finally, CFB riser simulations have been carried out by coupling of the two-fluid model and the bubble-based EMMS drag. The results show good agreement with experimental data. (C) 2014 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Engineering, Chemical |
| 研究领域[WOS] | Engineering |
| 关键词[WOS] | SOLID FLUIDIZED-BEDS ; MESOSCALE STRUCTURES ; SUBGRID MODEL ; 2-PHASE FLOW ; EQUATIONS ; CLUSTERS ; DENSITY ; REACTOR ; DRAG |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000341221800049 |
| 公开日期 | 2014-09-30 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/11402]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.Huaiyin Inst Technol, Coll Life Sci & Chem Engn, Huaian 223003, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China 3.Natl Inst Clean & Low Carbon Energy, Beijing 102209, Peoples R China 4.Pakistan Inst Engn & Appl Sci, Dept Chem Engn, Islamabad 45650, Pakistan |
| 推荐引用方式 GB/T 7714 | Hong, Kun,Shi, Zhansheng,Ullah, Atta,et al. Extending the bubble-based EMMS model to CFB riser simulations[J]. POWDER TECHNOLOGY,2014,266(11m):424-432. |
| APA | Hong, Kun,Shi, Zhansheng,Ullah, Atta,&Wang, Wei.(2014).Extending the bubble-based EMMS model to CFB riser simulations.POWDER TECHNOLOGY,266(11m),424-432. |
| MLA | Hong, Kun,et al."Extending the bubble-based EMMS model to CFB riser simulations".POWDER TECHNOLOGY 266.11m(2014):424-432. |
入库方式： OAI收割
来源：过程工程研究所
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