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A four-point finite difference implicit approach and Crank-Nicolson approach are utilized for the model and nonuniform grids are adopted. The simulated results have revealed that the four-point finite difference implicit approach is in good agreement with the previous studies, while the stability and precision are improved. This paper numerically validates the feasibility of high temperature condensation particle counter, which was proposed by Cambrige to replace the existing particle measurement program. The result shows that the cut-off size is 4 nm, thus eliminating the effect of volatile compounds. At last, the depletion of working medium is verified, which is caused by working fluid condensing on the particles, thus lowering saturation ratio can be safely neglected., authors=ZHANG Xin, CHEN Longfei, LIANG Zhirong, GONG Wei, ZHANG Dizhe, authorsList=ZHANG Xin, CHEN Longfei, LIANG Zhirong, GONG Wei, ZHANG Dizhe, authorCompany=School of Energy and Power Engineering, Beihang University, Beijing 100191, China, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=joZrJtxMOVdPh4jRw061pg==, pdfFileSize=1406010, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1242133244137779384, articleId=1242133242934014121, tenantId=1146029695717560320, 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科技导报
| 专题论文 2015, 33(6): 73-78
凝聚核粒子计数器的理论研究及数值模拟
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张鑫, 陈龙飞, 梁志荣, 龚伟, 张迪哲
作者信息
北京航空航天大学能源与动力工程学院, 北京100191
通讯作者:
陈龙飞,副教授,研究方向为燃烧和排放,电子信箱:chenlongfei@buaa.edu.cn
Theoretical investigation on condensation particle counter and its numerical simulation
Affiliations
出版时间: 2015-03-28
doi: 10.3981/j.issn.1000-7857.2015.06.012
文章导航
凝聚核粒子计数器是一种纳米级颗粒物的检测装置, 本文对该仪器的冷凝段进行了理论分析及数值模拟。数值模拟采用四点有限差分隐式法和Crank-Nicolson 法, 使用不等间距网格。结果显示四点有限差分隐式法模拟结果的稳定性和精确性良好, 并与前人的研究结果基本一致。在数值上对剑桥大学提出的高温凝聚核粒子计数器的可行性进行验证, 模拟结果显示, 高温下工作的凝聚核粒子计数器切割粒径为4 nm, 能够去除挥发性物质的影响。研究验证, 由于工质冷凝在颗粒表面而导致的工质损失以致过饱和度降低的影响可忽略不计。
颗粒物
/
凝聚核粒子计数器
/
数值模拟
/
不等间距网格
/
计数效率
This paper reports the theory and modeling of a nanoparticle monitor, the condensation particle counter. A four-point finite difference implicit approach and Crank-Nicolson approach are utilized for the model and nonuniform grids are adopted. The simulated results have revealed that the four-point finite difference implicit approach is in good agreement with the previous studies, while the stability and precision are improved. This paper numerically validates the feasibility of high temperature condensation particle counter, which was proposed by Cambrige to replace the existing particle measurement program. The result shows that the cut-off size is 4 nm, thus eliminating the effect of volatile compounds. At last, the depletion of working medium is verified, which is caused by working fluid condensing on the particles, thus lowering saturation ratio can be safely neglected.
aerosol
/
condensation particle counter
/
numerical simulation
/
nonuniform grids
/
counting efficiency
张鑫, 陈龙飞, 梁志荣, 龚伟, 张迪哲.
凝聚核粒子计数器的理论研究及数值模拟.
科技导报,
2015
, 33
(6)
: 73
-78
.
DOI: 10.3981/j.issn.1000-7857.2015.06.012
ZHANG Xin, CHEN Longfei, LIANG Zhirong, GONG Wei, ZHANG Dizhe.
Theoretical investigation on condensation particle counter and its numerical simulation[J].
Science & Technology Review ,
2015
, 33
(6)
: 73
-78
.
DOI: 10.3981/j.issn.1000-7857.2015.06.012
2015年第33卷第6期
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文章信息
doi: 10.3981/j.issn.1000-7857.2015.06.012
接收时间:2015-01-23
首发时间:2015-04-10
出版时间:2015-03-28
收稿日期:2015-01-23
修回日期:2015-02-03
通讯作者:
陈龙飞,副教授,研究方向为燃烧和排放,电子信箱:chenlongfei@buaa.edu.cn
https://castjournals.cast.org.cn/joweb/kjdb/CN/10.3981/j.issn.1000-7857.2015.06.012
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2种不同金属材料的力学参数
科 Family 属数 Number of genus 种数 Number of species 占总种数比例 Percentage of total species (%) 属 Genus 种数 Number of species 占总种数比例 Percentage of total species (%) 鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78 小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39 多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39 红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87 小菇属 Mycena 11 5.26 光柄菇属 Pluteus 5 2.39 红菇属 Russula 17 8.13 栓菌属 Trametes 5 2.39
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