Thesis-1996-Marshall.pdf (6.83 MB)
Aerodynamic sizing of non-spherical particles
thesis
posted on 2014-04-11, 11:25 authored by I.A. MarshallThe hypothesis of this thesis is that the time-of-flight method of determining an
estimate of the aerodynamic diameter of aerosol particles is fundamentally flawed
when applied to non-spherical and/or non-unit density particles. Such a
particle-sizing system, the TSI Aerodynamic Particle Sizer, is challenged with solid,
non-spherical particles of known aerodynamic diameter to assess the influence of
particle shape on instrument response. The aerodynamic diameter of the
non-spherical particles is also determined under gravitational settling. Deposits that
had been size-separated are resuspended for aerodynamic sizing by the APS. The
experimental study is supplemented by a theoretical investigation of the relative
effects of particle density and shape on APS-measured diameters. This is achieved
through the development of a computational routine to calculate the trajectories of
particles of various densities and shapes through the APS nozzle and sensing zone.
The results of these calculations are compared with the experimentally-measured APS
performance. The consequences for the traceability and accuracy of data measured
using this technique are assessed in the light of the outcome of both aspects of the
study.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Publisher
© I.A. MarshallPublication date
1996Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.362758Language
- en