ACCUMULATION OF SOLID PARTICLES ON SINGLE FIBERS EXPOSED TO AEROSOL FLOWS
Resource
AICHE JOURNAL v.26 n.2 pp.289-292
Journal
AICHE JOURNAL
Journal Volume
v.26
Journal Issue
n.2
Pages
289-292
Date Issued
1980
Date
1980
Author(s)
WANG, CHIU-SEN
BAROT
DEVENDRA, T
TIEN, CHI
Abstract
The phenomenon of particle accumulation plays an important role in many fluid-particle separation processes, such as gas cleaning by flbrous filters. One approach to understanaing the effects of particle accumulation is to study the formation and growth of particle deposits on single collectors as the “building blocks〞 of a fluid- particle separation device. Using this approach, we can formulate simple theoretical models to predict the effects of important parameters. Further, the theoretical models for single collectors can be tested by comparing the predictions directly with experimental data. When a single fiber is exposed to a stream of gas carrying solid particles , particle deposits on the fiber tend to grow in a dendritic from. This was first observed by Watson (1946), but no quantitative experimental results were reported until two decades later. In 1966, Billings measured the distribution of dendrite size, that is, the number of particles in each dendrite, as a function of the exposure time during which the fiber was placed normal to an aerosol stream. Among the data for seven single fibers reported by Billings, only two had size distributions determined at more than three different exposure times. And, the first measurement for each of the seven fibers was made after a significant number of dendrites had already formed on it. The data, therefore , do not comprise a sufficiently complete study of the dynamics of dendrite growth during the initial stage of particle accumulation. The first attempt to model the growth of particle clusters on fibers was made by Radushkevich ( 1964). His model assumes that a dendrite can be characterized by the number of particles it contains, regardless of the configuration. In 1976, Payatakes and Tien proposed a model which does take into account the effects of dendrite configuration by assuming that the particle chains grow in orderly patterns. Payatakes (1976a, b, 1977) reports further developments of this model. # B 0180025
Subjects
氣膠過濾
AEROSOL FILTRATION
Type
journal article