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Mass transfer properties (permeability and mass diffusivity) of four Australian hardwood species

Redman, A.L. and Bailleres, H. and Turner, I. and Perre, P. (2012) Mass transfer properties (permeability and mass diffusivity) of four Australian hardwood species. BioResources, 7 (3). pp. 3410-3424.

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Article URL: http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_07_3_3410_Redman_BTP_Mass_Transfer_Australian_Hardwood
Publisher URL: http://www.ncsu.edu/bioresources/index.htm

Abstract

Characterisation of mass transfer properties was achieved in the longitudinal, radial, and tangential directions for four Australian hardwood species: spotted gum, blackbutt, jarrah and messmate. Measurement of mass transfer properties for these species was necessary to complement current vacuum drying modelling research. Water-vapour diffusivity was determined in steady state using a specific vapometer. Permeability values of some species and material directions were extremely low and undetectable by the mass flow meter device. Hence, a custom system based on volume evolution was conceived to determine very low, previously unpublished, wood permeability values. Mass diffusivity and permeability were lowest for spotted gum and highest for messmate. Except for messmate, in the radial direction, the four species measured were less permeable in all directions than the lowest published figures, demonstrating the high impermeability of Australian hardwoods and partly accounting for their relatively slow drying rates. Premeability, water-vapour diffusivity, and associated anisotropic ratio data obtained for messmate were extreme or did not follow typical trends and is consequently the most difficult of the four woods to dry in terms of collapse and checkinng degradation.

Item Type:Article
Business groups:Agri-Science, Horticulture and Forestry Science
Additional Information:BioResources is sponsored by the College of Natural Resources at North Carolina State University, supported by the NC State Natural Resources Foundation. An open-access, web-based journal, with abstracts appearing in hypertext meta-language (HTML), and full articles downloadable for free as Adobe portable document format (PDF) files.
Keywords:Water vapour diffusivity; permeability; hardwood species; spotted gum; blackbutt; jarrah; messmate; mass transfer; vacuum drying modeling; anisotropy; Australia.
Subjects:Technology > Technology (General)
Forestry
Deposited On:26 Jul 2012 01:32
Last Modified:13 Jun 2013 03:15

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