This thesis is concerned with an experimental and modeling study of a novel drum dryer for black liquor utilizing multiple impinging jets of superheated steam. Drying of black liquor to solids contents in excess of 92% is a pre-requisite for some of the new black liquor recovery cycles being examined. / An experimental drum dryer was designed and built to evaluate the performance characteristics and effects of various operating parameters thereon. Appropriate ranges of parameters such as steam jet temperature and velocity were examined experimentally to quantify the optimal operating conditions for the formation of black liquor film on the drum surface as well as the drying kinetics. / To permit scale up of the laboratory scale data to industrial size a two-region mathematical model was developed to simulate the impinging jet flow and the drying of the black liquor film. Both polar and three dimensional cylindrical coordinate systems were employed for solving the governing transport equations. A modified low Reynolds number version of the $k sim varepsilon$ turbulence model was selected after a careful evaluation of the predictions of various $k sim varepsilon$ models for impingement flow and heat transfer. The computed heat transfer distribution on the film surface was applied as the boundary condition for the quasi unsteady one-dimensional diffusion model for the liquor film. Agreement between experimental data and results of the model was found to be satisfactory.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.29132 |
| Date | January 1995 |
| Creators | Shiravi, Amir Hossein |
| Contributors | Kubes, G. J. (advisor), Mujumdar, A. S. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Chemical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001475045, proquestno: NN08157, Theses scanned by UMI/ProQuest. |
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