Diffusion Coefficient Modelling of Thin-layer Drying of Paddy Using Spouted Free Fall Bed Dryer

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Siwakorn Sritunyakorn
Keerati Suluksna
Tawit Chitsomboon

Abstract

This research developed a new model to determine the moisture diffusion coefficient for the thin-layer paddy drying with the spouted free-fall bed dryer. The design and construction of the dryer was done to experiment with the drying kinetics. The experiment has studied under conditions of hot air temperature of 60-150 °C, the initial paddy mass of 5 - 15 kg and hot air velocity of 19 m/s. The results showed that the higher hot air temperature and the lower initial paddy mass resulted in a significant reduction in drying time. The experimental results were used to calibrate 12 of the most popular thin-layer drying models to find a suitable one, considering based on the root mean square error (RMSE), chi-squared value (χ2) and the correlation coefficient (r).  It was found that the popular thin layer drying model was able to accurately predict the effect of the moisture ratio, considering both the influence of hot air temperature and the initial paddy mass, in linear models. The highest accuracy was RMSE = 0.0279, χ2 = 0.00084 and r = 0.9938. In addition, the experimental results have been used to synthesize the new diffusion moisture coefficient, which is a function of initial paddy mass, temperature and drying time. This developed model was based on an exponential function with only 7 model constants. The simulated results observed that the new model achieved the average error only 1.8 percent compared with the best model that uses up to 24 model constants.

Article Details

How to Cite
[1]
S. Sritunyakorn, K. Suluksna, and T. Chitsomboon, “Diffusion Coefficient Modelling of Thin-layer Drying of Paddy Using Spouted Free Fall Bed Dryer”, RMUTP Sci J, vol. 14, no. 2, pp. 183–197, Dec. 2020.
Section
บทความวิจัย (Research Articles)

References

P. Thongma, "Paddy Drying by Spouted Bed Technique for Industrial Scale," M.S. thesis, Dept., Energy Tech., King Mongkut’s University of Technology Thonburi, Bangkok, Thailand, 1999.

P. Praneetpolkrang and K. Sathapornprasath, “Application of a Combined Jet Spouted Bed and Ultrasound Waves for Drying of Agricultural Products,” Srinakharinwirot Engineering Journal, vol. 12, no. 1, pp. 163-175, 2017.

S. Meesukchaosumran and T. Chitsomboon, “Effects of resting periods, air temperatures and air velocities on free-fall paddy dryer performances,” Suranaree Journal of Science and Technology, vol. 25, no. 1, pp. 11-26, Jan. 2018.

S. Khaengkarn, S. Meesukchaosumran and T. Chitsomboon, “Genetic algorithm for the selection of rough rice drying model for the free-fall paddy dryer,” Journal of Research and Applications in Mechanical Engineering, vol. 1, no. 1, pp. 63-75, 2011.

C. J. Lim and J. R. Grace, "Spouted bed hydrodynamics in a 0.91 m diameter vessel," The Canadian Journal of Chemical Engineering, vol. 65, no. 3, pp. 366-372, 1987.

N. Epstein and J. R. Grace, Spouted and Spout-Fluid Beds: Fundamentals and Applications, 1st ed. New York: Cambridge University Press, 2011.

M. J. San José, M. Olazar, R. Llamosas, M. A. Izquierdo and J. Bilbao, “Study of dead zone and spout diameter in shallow spouted beds of cylindrical geometry,” The Chemical Engineering Journal and the Biochemical Engineering Journal, vol. 64, no. 3, pp. 353-359, 1996.

S. Jongjam and U. Teeboonma, “Murdannia Lorifomis Drying Using Infrared-vacuum Technique,” Journal of Science & Technology, Ubon Ratchathani University, vol. 12, no. 3, pp. 75-85, 2010.

O. A. Aregbesola, B. S. Ogunsina, A. E. Sofolahan and N. N. Chime, “Mathematical modeling of thin layer drying characteristics of dika (Irvingia gabonensis) nuts and kernels,” Nigerian Food Journal, vol. 33, no. 1, pp. 83-89, Jun. 2015.

I. Alibas, “Selection of the Best Suitable Thin-Layer Drying Mathematical Model for Vacuum Dried Red Chili Pepper,” Journal of Biological and Environmental Sciences, vol. 6, pp. 161-170, Jan. 2012.

H. M. THAO and A NOOMHORM, “Modeling and effects of various drying methods on sweet potato starch properties,” Walailak Journal of Science and Technology, vol. 8, pp. 139-158, 2011.

N. Kumar, B. C. Sarkar and H. K. Sharma, “Mathematical modelling of thin layer hot air drying of carrot pomace,” Journal of food science and technology, vol. 49, no. 1, pp. 33-41, 2012.

J. Zhang, P. Ma, X. Zhang, B. Wang, J. Wu and X. Xing, “Isothermal drying kinetics of paddy using thermogravimetric analysis,” Journal of Thermal Analysis and Calorimetry, vol. 134, no. 3, pp. 2359-2365, Dec. 2018.

S. Mujaffar and S. John, “Thin-layer drying behavior of West Indian lemongrass (Cymbopogan citratus) leaves,” Food Science & Nutrition, Report no. 4, p. 1085, 2018.

C. L. Hii, C. L. Law and M. Cloke, “Modeling using a new thin layer drying model and product quality of cocoa,” Journal of Food Engineering, vol. 90, no. 2, pp. 191-198, Jan. 2009.

M. Özdemir and Y. Onur Devres, “The thin layer drying characteristics of hazelnuts during roasting,” Journal of Food Engineering, vol. 42, no. 4, pp. 225-233, Jan. 1999.

G. K. Jayatunga and B. M. W. P. K. Amarasinghe, “Drying kinetics, quality and moisture diffusivity of spouted bed dried Sri Lankan black pepper,” Journal of Food Engineering, vol. 263, pp. 38-45, 2019.

O. Hacihafizoğlu, A. Cihan, K. Kahveci and A. G. B. de Lima, “A liquid diffusion model for thin-layer drying of rough rice,” European Food Research and Technology, vol. 226, no. 4, pp. 787-793, 2008.

L. N. Kahyaoglu, S. Sahin and G. Sumnu, “Spouted bed and microwave-assisted spouted bed drying of parboiled wheat,” Food and Bioproducts Processing, vol. 90, no. 2, pp. 301-308, 2012.

M. Khanali, A. Banisharif and S. Rafiee, “Modeling of moisture diffusivity, activation energy and energy consumption in fluidized bed drying of rough rice,” Heat and Mass Transfer, vol. 52, no. 11, pp. 2541-2549, 2016.

D. I. Onwude, N. Hashim, R. B. Janius, N. M. Nawi and K. Abdan, “Modeling the Thin-Layer Drying of Fruits and Vegetables: A Review,” Comprehensive Reviews in Food Science and Food Safety, vol. 15, no. 3, pp. 599-618, 2016.

Z. Erbay and F. Icier, “A Review of Thin Layer Drying of Foods: Theory, Modeling, and Experimental Results,” Critical reviews in food science and nutrition, vol. 50, pp. 441-464, 2010.