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Moisture diffusivity and shrinkage of broad beans during bulk drying in an inert medium fluidized bed dryer assisted by dielectric heating

Hashemi, G ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jfoodeng.2008.12.004
  3. Publisher: 2009
  4. Abstract:
  5. Drying behavior of broad beans (Vicia faba) was studied in a pilot scaled fluidized bed dryer with inert particles assisted by dielectric heating. The effective diffusion coefficient of moisture transfer was determined by Fickian method at four different air drying temperatures of 35, 45, 55 and 65 °C. Correlations for moisture diffusivity as a function of moisture content and temperature of the drying medium were developed. The values of moisture diffusivity were obtained within the range of 1.27 × 10-9-6.48 × 10-9 m2/s and the activation energies for FBD and FBD + DE were found to be 27.71 and 17.10 kJ/mol, respectively. The shrinkage behavior of the broad beans was also investigated by considering the volume ratio of (V/VO) to be function of moisture content alone and fitting a polynomial of the third order. The dielectric heating power was also found to be effective on the rate of drying. © 2008 Elsevier Ltd. All rights reserved
  6. Keywords:
  7. Activation energy ; Curing ; Dewatering ; Dielectric heating ; Diffusion ; Dryers (equipment) ; Fluid dynamics ; Fluidized beds ; Heating ; Moisture ; Moisture control ; Moisture determination ; Probability density function ; Shrinkage ; Air drying ; Diffusivity ; Drying ; Drying behaviors ; Drying mediums ; Effective diffusion co-efficients ; Fluidized bed ; Fluidized bed dryers ; Heating power ; Inert mediums ; Inert particle ; Moisture contents ; Moisture diffusivities ; Moisture transfers ; Shrinkage behaviors ; Third orders ; Volume ratios ; Fluidization ; Vicia faba
  8. Source: Journal of Food Engineering ; Volume 92, Issue 3 , 2009 , Pages 331-338 ; 02608774 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0260877408005748