Effect of collapse on fitted diffusion coefficients for Victorian ash eucalypts |
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| Authors: | Philip A Blakemore Timothy A G Langrish |
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| Institution: | (1) CSIRO Forest Biosciences, Private Bag 10, Clayton South MDC, VIC, 3169, Australia;(2) School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, NSW, 2006, Australia |
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| Abstract: | Wet cores, recently observed in highly collapsed boards towards the end of pre-drying, suggest that a previously unobserved
relationship between collapse and the rate of internal moisture diffusion may exist. In this study, a drying model has been
used to fit the diffusion coefficient and other model parameters to the drying data from the earlier study. The model parameters
were fitted to six sub-samples from 20 sample boards (a total of 120 sub-samples). The model was only fitted to the drying
data from green to 50% average moisture content. An inter-relationship between basic density, collapse and the fitted diffusion
coefficient was established and discussed. It is suggested that the effect of collapse on diffusion coefficient could be the
result of two different mechanisms. |
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