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Drying Kinetics of Curcuma longa Rhizomes
Author(s) -
Mulet Antonio,
Blasco Miguel,
GarcíaReverter José,
GarcíaPérez Josév.
Publication year - 2005
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.2005.tb09971.x
Subject(s) - curcuma , rhizome , mass transfer , kinetics , arrhenius equation , thermodynamics , moisture , chemistry , materials science , diffusion , chromatography , botany , composite material , physics , quantum mechanics , biology
Modeling drying kinetics is very useful for optimization purposes. Hot air drying kinetics were carried out in monolayer at different temperatures (60°C, 70°C, 80°C, 90°C, and 100°C) and for different sample types (peeled and unpeeled rhizomes of different sizes). Mathematical models based on Fick's law were used to describe water removal, considering different boundary conditions and geometries. Effective moisture diffusivities identified from modeling presented an Arrhenius‐type relationship. An additional mass transfer resistance was identified as due mainly to the peridermis layer (peridermial resistance). The accuracy of the model assuming peridermial resistance only in the radial direction and solved using the finite differences method was illustrated, and the mass transfer coefficient was identified (k = 9.7 × 10 ‐5 kg water/m 2 /s). Keywords: Curcuma longa , drying, modeling, peridermial resistance