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

BALBAY A., ŞAHİN Ö., Ulker H.

THERMAL SCIENCE, cilt.17, sa.3, ss.839-846, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 17 Sayı: 3
  • Basım Tarihi: 2013
  • Doi Numarası: 10.2298/tsci110307040b
  • Dergi Adı: THERMAL SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.839-846
  • Anahtar Kelimeler: drying, mathematical modeling, unshelled pistachio, activation energy, SOLAR DRYER, LAYER
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

Drying kinetics of pistachio kernels with initial moisture content of 32.4% wet basis 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 degrees C) and air velocities (0.05, 0.075, and 0.1 m/s). Several experiments were performed in terms of mass of pistachio kernels (15 g and 30 g) using a constant air velocity of 0.075 m/s. The fit quality of models was evaluated using the determination coefficient, sum square error, and root mean square error. Among the selected models, the Midilli et al model was found to be the best models for describing the drying behavior of pistachio kernels. The activation energies were calculated as 29.2 kj/mol and effective diffusivity values were calculated between 1.38 and 4.94.10(-10) m(2)/s depending on air temperatures.