Influence of Shrinkage during Drying on Curcuma Effective Diffusivity with 2D Image Analysis

Lamhot Parulian Manalu, Subandrio Subandrio, Harianto Harianto, Armansyah Halomoan Tambunan


The effects of drying conditions on shrinkage of curcuma were studied. A thin-layer dryer with machine vision 2D system and image analysis software was used. Curcuma slices were dried at temperatures of 50, 60 and 70 oC and the falling drying rate data were used to calculate the effective diffusion coefficients from the Fick’s equation. Changes in area of the slice were measured every 5 minute during drying. Shrinkage showed almost linear relation with moisture content. It was found that air temperature had no significant effect on shrinkage. Shrinkage of volume and surface area of curcuma slices at the studied air drying temperatures ranges from 0.6719 to 0.9183 and 0.0575 to 0.2190 respectively. The linear equation model is fittable to represent the shrinkage of sliced curcuma with high coefficient of determination. Effective diffusivity values by considering the shrinkage were estimated in the range of 4.93-7.18 × 10-9 m2/s, while without considering the shrinkage were in the range of 10.4-14.4 × 10-9 m2/s.

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Mayor L and Sereno AM. 2004. Modelling shrinkage during convective drying of food materials: a review. J Food Eng 61(3):373–386.

Anonymous. 2013. potensi- ekspor- herbal-indonesia- rp12-35-triliun-pada-2012. [accessed on June 25, 2013].

Lozano JE, Rotstein E, Urbicain MJ. 1983. Shrinkage, porosity and bulk density of foodstuffs at changing moisture contents. J Food Sci 48(5):1497–1502.

Al-Muhtaseb AH, McMinn WAM, Magee TRA. 2004. Shrinkage, density and porosity variations during the convective drying of potato starch gel. Proceedings of the 14th International Drying Symposium (IDS). São Paulo, Brazil, vol. C, p. 1604–1611.

Hernandez JA, Pavon G, Garcia MA. 2000. Analytical solution of mass transfer equation considering shrinkage for modeling food drying kinetics. J Food Eng 45(1):1–10.

Hatamipour MS and Mowla D. 2002. Shrinkage of carrots during drying in an inert medium fluidized bed. J Food Eng 55(3):247–252.

Liu G, Chen J, Liu M, Wan X. 2012. Shrinkage, porosity and density behaviour during convective drying of bio-porous material. Procedia Engineering 31: 634 – 640.

Manalu LP, Tambunan AH. 2015. The Effects Of Shrinkage On Drying Characteristics Of Sliced Zedoary. J Teknologi Industri Pertanian 25(3):271-278.

Yan Z, Sousa-Gallagher MJ, Oliveira FAR. 2008. Shrinkage and porosity of banana, pineapple and mango slices during air-drying. J Food Eng 84(3):430–440.

Mendiola RC et al. 2007. Non-isotropic shrinkage and interfaces during convective drying of potato slabs within the frame of the systematic approach to food engineering systems (SAFES) methodology. Original Research Article. J Food Eng 83(2), 285-292.

Fernandez L, Castillero C, Aguilera JM. 2005. An application of image analysis to dehydration of apple discs. J Food Eng 67(1-2): 185–193.

Yadollahinia A and Jahangiri M. 2009. Shrinkage of potato slice during drying J Food Eng 94:52–58.

Manalu LP, Tambunan AH, Nelwan LO, Hoetman AR. 2009. The thin layer drying of temu putih herb. Proceedings of the 6th Asia-Pacific Drying Conference (ADC2009); Bangkok, Thailand, October 19-21, 2009 p. 402-409.

Crank J. 1975. The Mathematics of Diffusion, 2nd Ed. New York: Oxford University Press.

Madamba PS, Driscoll RH, Buckle KA. 1996. The thin-layer drying characteristic of garlic slices. J Food Eng 29(1):15-97.

Menges HO and Ertekin C. 2006. Mathematical modeling of thin layer drying of golden apples. J Food Eng 77(1), 119–125.

Ortiz-García-Carrasco B, et al. (2015). Drying of shrinkable food products: Appraisal of deformation behavior and moisture diffusivity estimation under isotropic shrinkage. J Food Eng 144(1), 138–147.

Lang W and Sokhansanj S. 1993. Bulk volume shrinkage during

drying of wheat and canola. J Food Process Eng 16(4):305–314.

Zogzas NP and Maroulis ZB. 1996. Effective moisture diffusivity estimation from drying data. A comparison between various methods of analysis. Dry Technol 14(7&8):1543–1573.

Marinos-Kouris D and Maroulis ZB. 1995. Transport properties in the drying of solids. In: Mujumdar AS, editor. Handbook of Industrial Drying. 2nd Ed. New York: Marcel Dekker Inc.

Zielinska M and Markowski M. 2010. Air drying characteristics and moisture diffusivity of carrots. Chem Eng Process 49(2):212–218.


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