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The thermodynamics of sorption with reference to klinki pine

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Summary

An investigation into the bonding energy relationships for water in wood indicates that as the temperature increases at constant total moisture content, water moves from within the chemical structure to the adsorption surface. The analysis is evaluated for the wood Araucaria klinkii Lauterb and it is indicated that at 25 °C, less water is held in the chemical structure during adsorption than during desorption.

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Abbreviations

A:

amplitude of liquid surface profile

A0 :

amplitude of solid surface profile

a:

mean radius of curvature of liquid surface (bubble radius), Å

a0 :

mean radius of curvature of solid surface, Å

ac :

a constant value of a, Å

F:

a function of temperature

f:

capisorption energy fraction

G:

a function of ν

g:

specific Gibbs free energy of saturated water vapour relative to unsaturated water vapour at the same temperature, J/kg

gc :

specific Gibbs free energy associated with capisorption, J/kg

gp :

specific Gibbs free energy associated with physisorption, J/kg

Δh:

change in specific enthalpy of liquid water as it is desorbed, J/kg

l:

latent heat of vaporisation of free water, J/kg

m:

wave number/m

ps :

pressure of water vapour at saturation, Pa

R:

specific gas constant for water vapour, J/kg K

r:

relative humidity

Δs:

change in specific entropy of liquid water as it is desorbed, J/kg K

T:

temperature, K

w:

dry basis moisture content

x:

ln ps/ps25

y:

In r

z:

length coordinate, m

α, β, γ:

constant coefficients

Δ:

change in mean height of liquid surface, Å

Δ0 :

a constant length, Å

λ:

constant

ν:

distance from solid to liquid vapour interface measured normal to solid surface, Å

ν0 :

a constant value of ν, Å

References

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Authors and Affiliations

  1. CSIRO, Division of Forestry and Forest Products, Private Bag 10, 3168, Clayton Vic., Australia

    A. J. Hunter

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  1. A. J. Hunter
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Hunter, A.J. The thermodynamics of sorption with reference to klinki pine. Wood Sci.Technol. 25, 179–192 (1991). https://doi.org/10.1007/BF00223469

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  • DOI: https://doi.org/10.1007/BF00223469

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