FRACTAL AND PROJECTED STRUCTURE PROPERTIES OF SOOT AGGREGATES

被引:403
作者
KOYLU, UO
FAETH, GM
FARIAS, TL
CARVALHO, MG
机构
[1] UNIV MICHIGAN,DEPT AEROSP ENGN,ANN ARBOR,MI 48109
[2] INST SUPER TECN,DEPT ENGN MECH,P-1096 LISBON,PORTUGAL
关键词
D O I
10.1016/0010-2180(94)00147-K
中图分类号
O414.1 [热力学];
学科分类号
摘要
The structure of soot aggregates was investigated, emphasizing the fractal properties as well as the relationships between the properties of actual and projected soot images. This information was developed by considering numerically simulated soot aggregates based on cluster-cluster aggregation as well as measured soot aggregates based on thermophoretic sampling and analysis by transmission electron microscopy (TEM) of soot for a variety of fuels (acetylene, propylene, ethylene, and propane) and both laminar and turbulent diffusion flame conditions. It was found that soot aggregate fractal properties are relatively independent of fuel type and flame condition, yielding a fractal dimension of 1.82 and a fractal prefactor of 8.5, with experimental uncertainties (95% confidence) of 0.08 and 0.5, respectively. Relationships between the actual and projected structure properties of soot, e.g., between the number of primary particles and the projected area and between the radius of gyration of an aggregate and its projected image, also are relatively independent of fuel type and flame condition.
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收藏
页码:621 / 633
页数:13
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