Deposition of Particles in a Turbulent Slot Flow.
Abstract
The mechanism and extent of deposition of 0.1 to 15 micron particles out of a turbulent slot flow onto the slot walls is investigated in this paper. The application of the phenomenon to the design of a practical self cleaning air filter is considered. Both one and two dimensional analyses of the problem are presented. Experimental work and data is given for the former case. The experimental problem is discussed for the latter. In the one-dimensional experimental work measurements were made of the particle concentration changes in a flow passing through slots of different lengths for six particle sizes from 0.35 micron to 4.50 micron over a range of Reynolds numbers from 500 to 2,000. Sampling probes and a light-scattering type particle counter were used with a liquid aerosol of dibutyl phthalate. The experimental results show excellent correlation with the one-dimensional deposition theory. Regression analyses of the present work and of previous work were made, showing the measured effect of the various parameters on deposition over a considerable range of values for the independent variables. Surface effects are considered and analysed. A preliminary design for a possible gas turbine air filter for ground vehicle use is discussed and its performance predicted. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1972
- Accession Number
- AD0914084
Entities
People
- Herbert Hotaling Dobbs
Organizations
- Tank-automotive and Armaments Command