Drying Rate of Wood Particles With Longitudinal Mass Transfer

[+] Author and Article Information
B. Dorri, A. F. Emery, P. C. Malte

Department of Mechanical Engineering, University of Washington, Seattle, Wash. 98195

J. Heat Transfer 107(1), 12-18 (Feb 01, 1985) (7 pages) doi:10.1115/1.3247368 History: Received August 01, 1983; Online October 20, 2009


The drying of small wood particles of shape L:W:t = 3 to 5:2:1 is examined by three numerical models, and results are compared to measurements. (i) A one-dimensional rectangular model has liquid water concentrated in the center of a particle, and this is removed as an evaporation front propagates into the liquid. (ii) The one-dimensional model is also treated by the volume-averaged, or “smeared” approach, for which the moisture at any point is a distribution of liquid and vapor. For the simple rectangular geometry, the frontal and smeared models give similar results. (iii) Equivalent spherical particles are analyzed by a smeared model which includes capillarity. Reasonable agreement is obtained between the spherical results and the measurements, though an overprediction in drying rate occurs for slender particles.

Copyright © 1985 by ASME
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