[1]姚刚,沈湘林.基于分形的超细颗粒声波团聚数值模拟[J].东南大学学报(自然科学版),2005,35(1):145-148.[doi:10.3969/j.issn.1001-0505.2005.01.031]
　Yao Gang,Shen Xianglin.Numerical simulation of ultrafine particle acoustic agglomeration based on fractal model[J].Journal of Southeast University (Natural Science Edition),2005,35(1):145-148.[doi:10.3969/j.issn.1001-0505.2005.01.031]
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基于分形的超细颗粒声波团聚数值模拟()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
35
期数:
2005年第1期
页码:
145-148
栏目:
环境科学与工程
出版日期:
2005-01-20

文章信息/Info

Title:
Numerical simulation of ultrafine particle acoustic agglomeration based on fractal model
作者:
姚刚;  沈湘林
东南大学洁净煤发电与燃烧技术教育部重点实验室, 南京 210096
Author(s):
Yao Gang;  Shen Xianglin
Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
超细颗粒物;  声波团聚;  分形
Keywords:
ultrafine particles;  acoustic agglomeration;  fractal dimension
分类号:
X513
DOI:
10.3969/j.issn.1001-0505.2005.01.031
摘要:
利用声波团聚同向合并作用模型和气溶胶团聚动力学方程,分别对考虑和不考虑团聚体分形特性下的超细固体颗粒声波团聚效果进行了模拟.将模拟结果和实验进行了对比,例如在与实验相同的条件下,经过声波作用3 s后,不考虑和考虑团聚体分形的团聚颗粒平均半径的模拟结果分别为1.44 μm和7.89 μm,而实验值为7.50 μm,这表明不考虑分形时模拟结果和实验值相差很大,而考虑分形特性的团聚模拟结果和实验值符合较好.在此基础上进一步数值模拟了声场强度、声波频率、颗粒质量浓度等参数在考虑分形的条件下对团聚效果的影响,结果表明,团聚效果随颗粒质量浓度线性增加,随声波强度呈指数增加,对声波频率则存在一个团聚效果最佳的频率值.
Abstract:
Based on the acoustic orthokinetic agglomeration interaction model and aerosol agglomeration dynamic equation, the acoustic agglomeration of ultrafine solid particles was simulated under the condition with and without considering the fractal characteristics of the aggregates, respectively. The simulated results were compared with experimental results. The comparison shows that under the same conditions as the experiment and after 3 s acoustic aggregation, the mean radii of aggregates with and without considering fractal characteristics are 1.44 μm and 7.89 μm, respectively, while the experimental value is 7.50 μm. It means that the results considering fractal characteristics of aggregates accord well with the experimental results. Therefore the fractal characteristics of solid particles must be considered when they undergo acoustic agglomeration. Based on the above calculation, the influences of acoustic intensity, acoustic frequency and particle concentration on acoustic agglomeration were studied. The results show that the agglomeration effect increases with particle mass concentration linearly, and with sound intensity exponentially, and there is an optimal sound frequency for the agglomeration.

参考文献/References:

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备注/Memo

备注/Memo:
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2002CB211600).
作者简介: 姚刚(1976—),男,博士生; 沈湘林(联系人),男,教授,博士生导师,xlshen@seu.edu.cn.
更新日期/Last Update: 2005-01-20