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Heat and Mass Transfer

, Volume 54, Issue 5, pp 1545–1554 | Cite as

Water sorption equilibria and kinetics of henna leaves

  • Khamsa Sghaier
  • Roman Peczalski
  • Mohamed Bagane
Technical Note
  • 70 Downloads

Abstract

In this work, firstly the sorption isotherms of henna leaves were determined using a dynamic vapor sorption (DVS) device at 3 temperatures (30, 40, 50 °C). The equilibrium data were well fitted by the GAB model. Secondly, drying kinetics were measured using a pilot convective dryer for 3 air temperatures (same as above), 3 velocities (0.5, 1, 1.42 m/s) and 4 relative humidities (20, 30, 35, 40%). The drying kinetic coefficients were identified by fitting the DVS and pilot dryer data by Lewis semi-empirical model. In order to compare the obtained kinetic parameters with literature, the water diffusivities were also identified by fitting the data by the simplified solution of fickian diffusion equation. The identified kinetic coefficient was mainly dependent on air temperature and velocity what proved that it represented rather the external transfer and not the internal one.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Khamsa Sghaier
    • 1
  • Roman Peczalski
    • 2
  • Mohamed Bagane
    • 1
  1. 1.Unité de recherche Thermodynamique Appliquée, Ecole Nationale d’Ingénieurs de GabèsUniversité de GabèsGabèsTunisie
  2. 2.Laboratoire d’Automatique et Génie des Procèdes (LAGEP), UMR CNRS 5007, Domaine de la DouaUniversité de Lyon, Université Claude Bernard Lyon 1VilleurbanneFrance

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