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Modeling of combined far-infrared radiation and air drying of a ring shaped-pineapple with/without shrinkage

Paper ID Volume ID Publish Year Pages File Format Full-Text
19321 43059 2012 10 PDF Available
Title
Modeling of combined far-infrared radiation and air drying of a ring shaped-pineapple with/without shrinkage
Abstract

A ring shape is commonly used for industrial process of pineapple. Unfortunately, there has been no study on modeling of pineapple rings. Therefore we developed the mathematical model of pineapple rings during combined far-infrared radiation and air convection drying to investigate the evolutions of moisture content and qualities. The drying model based on the solution of Fick's law was used to estimate moisture diffusion coefficient (D). The D values with and without taking into account shrinkage phenomenon of dried products were compared. The kinetics of dried pineapple qualities such as color, shear force ratio and shrinkage during drying also were studied. Pineapples were pretreated, cut into rings and dried at far-infrared intensities of 1–5 kW/m2 combined with air temperatures of 40–60 °C and air velocities of 0.5–1.5 m/s. The D values were found to increase with increasing intensity and air temperature. The D values with shrinkage consideration were lower than the D values without shrinkage consideration for all drying conditions. The quartic model gave a better fit over the other three polynomial models for describing the color kinetics. The thin layer drying models such as Page, Henderson and Pabis, Logarithmic and Midilli–Kucuk were modified in order to describe shear force ratio (SFR) of dried pineapple. The statistically analyses from this present study indicated that modification of drying models can be used to describe the kinetics of SFR and Midilli–Kucuk's form gave a better fit over the other form. The quadratic model was better than the linear model to predict shrinkage kinetics for all four dimensions (outer radius, inner radius, thickness and volume) of pineapple rings.

► Mathematical model of pineapple rings has been developed for the first time. ► The D values were found to increase with increasing intensity and air temperature. ► An increase in air velocity did not significantly affect the moisture curves. ► Modification of drying models can describe the kinetics of shear force ratio.

Keywords
Far-infrared drying; Finite hollow cylinder; Diffusion coefficient; Color; Shear force ratio; Shrinkage
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Modeling of combined far-infrared radiation and air drying of a ring shaped-pineapple with/without shrinkage
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 90, Issue 2, April 2012, Pages 155–164
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us