Particle Measurements Using Fluctuations in the Regular Transmittance of Light Through a Particle Dispersion: Concentration and Particles size - Theory, Measurement Principles and Applications for Pulp and Paper Production
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
The regular transmittance of light or similar radiation through a flowing suspension of particles fluctuates because of the random occurrence of particles in the beam.In the work presented here, a theory for this fluctuating behaviour with the emphasison dispersions of mm-length slender cylindrical particles having circular crosssections is given. The particles in question are wood pulp fibres, which as a first approximation are considered to have a cylinder shape. Four possible measurementprinciples are described theoretically and experimentally. The four principles are for the measurement of concentration, length distribution characterized as lengthclasses, mean length, and mean width. The usefulness in industrial process monitoring of two of these principles is exemplified with pulp measurements. In order to estimate model errors, numerical simulations were used. Although other techniques such as image analysis may compete, the technique presented here is attractive because of the simplicity of the measurement device used.
Place, publisher, year, edition, pages
Stockholm: KTH , 2009. , xxv, 111 p.
Trita-IIP, ISSN 1650-1888 ; 09:05
Particle concentration, Particle size, Cylindrical particles, Large particles, Cellulose fibres, Wood pulp fibres, Suspensions, Particle length, Particle length distribution, Particle width
Production Engineering, Human Work Science and Ergonomics
IdentifiersURN: urn:nbn:se:kth:diva-10639ISBN: 978-91-7415-254-8OAI: oai:DiVA.org:kth-10639DiVA: diva2:222536
2009-06-15, Sal M311, KTH, Brinellvägen 68,, Stockholm, 10:00 (English)
Gregory, John, Professor
Mattsson, Lars, Professor
QC 201008062009-06-092009-06-092010-08-06Bibliographically approved
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