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Simulation and experimental studies ...

Huang, Huai.

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Simulation and experimental studies of dense fractal aggregate systems.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Simulation and experimental studies of dense fractal aggregate systems./
Author:	Huang, Huai.
Description:	125 p.
Notes:	Major Professor: Christopher M. Sorensen.
Contained By:	Dissertation Abstracts International58-06B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9736753
ISBN:	0591467380

Simulation and experimental studies of dense fractal aggregate systems.
Huang, Huai.

Simulation and experimental studies of dense fractal aggregate systems. - 125 p.

Major Professor: Christopher M. Sorensen.

Thesis (Ph.D.)--Kansas State University, 1997.

Dense aggregating systems have attracted a lot of research interest recently. A wide variety of systems show that the scattered light intensity exhibits a peak at a finite wave vector

ISBN: 0591467380Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Simulation and experimental studies of dense fractal aggregate systems.
LDR:02947nam 2200301 a 45 001 931006
005 20110429
008 110429s1997 eng d
020 $a 0591467380
035 $a (UnM)AAI9736753
035 $a AAI9736753
040 $a UnM $c UnM
100 1 $a Huang, Huai. $3 1254554
245 1 0 $a Simulation and experimental studies of dense fractal aggregate systems.
300 $a 125 p.
500 $a Major Professor: Christopher M. Sorensen.
500 $a Source: Dissertation Abstracts International, Volume: 58-06, Section: B, page: 3104.
502 $a Thesis (Ph.D.)--Kansas State University, 1997.
520 $a Dense aggregating systems have attracted a lot of research interest recently. A wide variety of systems show that the scattered light intensity exhibits a peak at a finite wave vector $q \sb{m}.$ Scaling for the scattered intensity is found at late stages of aggregation but not at early stages. The current interpretation is that $q \sbsp{m}{-1}$ represents a characteristic length scale of the system.
520 $a To study these phenomena we have used a two-dimensional DLCA simulation to create a dense system of fractal aggregates. We show that two length scales exist in the system, the cluster size and the separation between nearest neighbor clusters. The two length scales evolve with different time dependencies. Thus scaling cannot occur. But at late stages, the two length scales become comparable in magnitude so that their individual effects on the structure factor overlap and thereby cancel each other resulting in an apparent scaling. However, this apparent scaling is an artifact and the length scale $q \sbsp{m}{-1}$ is not fundamentally related to either of the inherent length scales of the system.
520 $a We have performed experiments to study acetylene diffusion flames which produce dense fractal soot clusters. At low fuel flow rate, light scattering shows submicron clusters of soot. As the flow rate is increased, a threshold occurs in which large soot clusters (a few hundred $\mu $m ) suddenly appear. Such large soot clusters have never been studied other than in our lab. The growth kinetics of these large clusters is 5 orders of magnitude faster than the Brownian kinetics responsible for "normal" soot growth. An unusual structure factor has been found for the acetylene soot system. A fractal regime is seen at large q indicating the existence of submicron clusters with fractal dimension of 1.8. At small q, the scattered intensity increases rapidly with a slope of 3.1 in a log-log plot. Possible causes for this unusual structure factor pattern are discussed, including a fractal cluster gelation process.
590 $a School code: 0100.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Optics. $3 1018756
690 $a 0611
690 $a 0752
710 2 0 $a Kansas State University. $3 1017593
773 0 $t Dissertation Abstracts International $g 58-06B.
790 $a 0100
790 1 0 $a Sorensen, Christopher M., $e advisor
791 $a Ph.D.
792 $a 1997
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9736753