Some Remarks on the Classification of Water Vapor Sorption Isotherms and Blahovec and Yanniotis Isotherm Equation

Abstract

Mathematical analysis was performed on equations describing water vapor sorption isotherms. It was shown that an identity exists between the Blahovec and Yanniotis (BY), D'Arcy and Watt (DW), and generalized D'Arcy and Watt (GDW) models. The original BY model has been modified to account for temperature dependence of the model parameters. This modification enables the application of this model to describe sorption data obtained at different temperatures. A new method for classification of sorption isotherms has been proposed that is much simpler than the classification established by Blahovec and Yanniotis.

Keywords:

• Blahovec and Yanniotis isotherm
• Theoretical models
• Water vapor sorption

ACKNOWLEDGMENT

SF gratefully acknowledges financial support from the Foundation for Polish Science.

Notes

*– parameter values taken from.^{[ 10 ]}

*– the values arranged according to the rise in the temperature.