Optimization of convective drying process for Persian shallot using response surface method (RSM)

Authors

  • Reza Amiri Chayjan Bu-Ali Sina University
  • Mosayeb Fealekari Bu Ali Sina University

Keywords:

color, diffusivity, energy, central composite design, shrinkage

Abstract

Abstract: Optimization of convective drying process of Persian shallot was investigated using dependent variables of effective moisture diffusivity (Deff), specific energy consumption (SEC), shrinkage and color changes.  The central composite design (CCD) was selected for design and optimization of the process.  The second-order polynomial models with transformed responses were developed from experimental data to generate three dimensional response surfaces and contour plots.  Experiments were performed at air temperatures of 40°C, 55°C and 70°C, air velocities of 0.5, 1.5 and 2.5 m/s and slice thicknesses of 2, 4, and 6 mm in triplicate.  Based on response surface and desirability functions, the optimum conditions for Persian shallot drying were: air temperature 70°C, air velocity 2.5 m/s and slice thickness 4.58 mm.  At this point, Deff, SEC, shrinkage and color changes were obtained as 1.18675×10-9 m2/s, 13.83 MJ/kg, 35.04% and 42.27%, respectively.

 

Keywords: color, diffusivity, energy, central composite design, shrinkage

Author Biographies

Reza Amiri Chayjan, Bu-Ali Sina University

Department of Biosystems Engineering,

Associated Prof.

Mosayeb Fealekari, Bu Ali Sina University

Department of Biosystems Engineering,

Msc Student

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Published

2014-06-30

Issue

Section

VI-Postharvest Technology and Process Engineering