System Design, Mathematical Modelling and Simulation of Process Drying in a SolarGas Convective Tunnel Dryer

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Author(s) 
Hatem Oueslati, Salah Ben Mabrouk, Abdelkader Mami 

KEYWORDS 
— Tunnel dryer, Mathematical model, Heat and mass transfer, Simulation 

ABSTRACT 
In this paper, we present a study of convective drying for wet agricultural product by hot air. The system used is a tunnel dryer, it works with different sources of energy (solar, gas, electric), and has been conceived to dry several agricultural products. This system operates in open loop for adjustable air in temperature and velocity. The objective of this work is to establish a mathematical model describing the phenomena of heat and mass transfer at the product layer and in the air. The drying process is simulated under real operating conditions based on a thin layer model and experimental drying kinetics. 

References 

[1] R. B. Keey "Drying principles and Practice". Oxford, UK.
[2] J.V. Brakel "Mass transfer in convective drying: In Advances in
Drying". Vol. 1, A.S. Mujumdar Edn. Hemisphere Publication
Corp., New York (1972).
[3] D. S. Lee and Y. R. Pyun, "Optimization of operating conditions in
tunnel drying". Drying Technology, 11(5): pp.10251052(1993).
[4] S. B. Mabrouk, and A. Belghith 2000. "Development of the solar
crop dryers in Tunisia". World Renewable Energy Congress VI, 3:
pp.2206 – 2212(WREC”2000).
[5] N. Boukadida and S. B. Nasrallah "Mass and heat transfer during
water evaporation in laminar flow inside a rectangular channel—
validity of heat and mass transfer analogy" Int. J. Therm. Sci. 40:
pp. 67–81(2001).
[6] Y. Jannot and Y. Coulibaly "The evaporative capacity as a
performance index for a solardryer airheater". Solar energy
Vol.63, No, 6: pp. 387391(1991).
[7] J. M. Herrero and M.R. HerasCelemin "Dynamic physical model
for a solar chimney" Solar Energy 81: pp. 614–622 (2007).
[8] D. Pallet , M. Fournier and A. Themelin "Modélisation,
Identification et simulation d’un Séchoir Solaire à Bois". Revue.
Phys. Appl, 22: pp. 13991409(1987).
[9] W. K. Lewis, "The Rate of Drying of Solid Materials". Journal of
Industrial Engineering Chemistry, 13(5): pp. 427–432(1921).
[10] A. Lopez, A. Iguaz, A. Esnoz and P. Vırseda, "Thin Layer
Behaviour Of Vegetable Wastes From Wholesale Market". Drying
Technology, 18(4&5): pp. 985–994(2000a).
[11] C. Van Der Berg "Description of water activity of foods for
engineering purposes by means of the G.A.B. model of sorption".
In B. M. McKenna (Ed.), Engineering and foods: Vol. 1 p. 311).
New York: Elsevier Applied Science (1984).
[12] A. Lopez, A. Iguaz, A. Esnoz and P. Vırseda, "Modelling Of
Sorption Isotherms Of Dried Vegetable Wastes From Wholesale
Market". Drying Technology, 18(4&5) pp. 995–1006(2000b).
[13] S. B. Mabrouk , B. Khiari and M. Sassi "Modelling of heat and
mass transfer in a tunnel dryer"Applied Thermal Engineering (26):
pp. 2110–2118(2006).
[14] C. Tiris, N. Ozbalta, M. Tiris and I. Dincer Performance of a solar
dryer. Energy, (19): pp. 993997 (1994).
[15] L. Bennamoun and A. Belhamri "Numerical simulation of drying
under variable external conditions: Application to solar drying of
seedless grapes". Journal of Food Engineering, 76(2): pp.179–
187(2006).
[16] I. T.Tog˘rul and D. Pehlivan "Modelling of thin layer drying
kinetics of some fruits under openair sun drying process". Journal
of Food Engineering, (65): pp. 413–425(2004).
[17] J. C. Laguerre, A. Lebert, G. Trystram and J. J. Bimbenet "A
comparmental model to describe drying curves of foodstuffs
under variable conditions". In A. S. Mujumdar & I. Filkova´ (Eds.),
Drying 91 (pp. 361–368). Amsterdam, New York: Elsevier(1991).
[18] S. Azzouz, A. Guizani, W. Jomaa and A. Belghith "Moisture
diffusivity and drying kinetic equation of convective drying of
grapes". Journal of Food Engineering, (55): pp. 323–330 (2002).


