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A mathematical model for drum drying of black liquor slurry using superheated steam impinging jets
Author(s) -
Shiravi Amir H.,
Mujumdar Arun S.,
Kubes George J.
Publication year - 1998
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450760613
Subject(s) - slurry , mass transfer , superheating , heat transfer , mechanics , turbulence , drum , superheated steam , reynolds number , thermodynamics , materials science , mechanical engineering , physics , engineering
A mathematical model is developed and tested for drum drying of an aqueous slurry subjected to impinging jets of superheated steam. The heat and mass transfer within the slurry film was modeled as a one dimensional, pseudo unsteady diffusion problem while the external convective heat transfer rate was obtained by solving the steady full conservation equations of mass, momentum and energy numerically in two and three dimensions. A modified low Reynolds number version of the k ‐ϵ turbulence model was selected after a careful evaluation of the predictive performance of various k ‐ϵ models for impingement flow and heat transfer. The computed heat transfer one‐dimensional diffusion model for the slurry film. Agreement between experimental data obtained using a black liquor slurry and results of the model was found to be satisfactory.