THERMAL SCIENCE

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Asım Balbay

,

Ömer Şahin

,

Hakan Ülker

MODELING OF CONVECTIVE DRYING KINETICS OF PISTACHIO KERNELS IN A FIXED BED DRYING SYSTEM

ABSTRACT
Drying kinetics of Pistachio kernels (PKs) with initial moisture content of 32.4% (w.b) was investigated as a function of drying conditions in a fixed bed drying system. The drying experiments were carried out at different temperatures of drying air (40, 60 and 80°C) and air velocities (0.05, 0.075 and 0.1 m/s). Several experiments were performed in terms of mass of PKs (15g and 30g) using a constant air velocity of 0.075 m/s. The fit quality of models was evaluated using the determination coefficient (R2), sum square error (SSE) and root mean square error (RMSE). Among the selected models, the Midilli et al model was found to be the best models for describing the drying behavior of PKs. The activation energies were calculated as 29.2 kJ/mol and effective diffusivity values were calculated between 1.38 and 4.94x10-10 m2/s depending on air temperatures.
KEYWORDS
drying, mathematical modeling, unshelled pistachio, activation energy
PAPER SUBMITTED: 2011-03-07
PAPER REVISED: 2012-02-14
PAPER ACCEPTED: 2012-03-11
DOI REFERENCE: https://doi.org/10.2298/TSCI110307040B
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2013, VOLUME 17, ISSUE Issue 3, PAGES [839 - 846]
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Modeling of convective drying kinetics of Pistachio kernels in a fixed bed drying system

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