MATHEMATICAL MODELING FOR DRYING FIGS IN THIN-LAYER USING MECHANICAL DRYER | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 53, Volume 27, Issue 4, October 2010, Page 1869-1878 PDF (543.13 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2010.105356 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. A. Helmy1; H. M. Sorour1; M. M. El-Kholy2; H. S. El-Mesery3 | ||||
| 1Professor of Agric.Eng., Agric. Eng. Dept., Fac. of Agric., Kaferelsheikh Univ., Egypt. | ||||
| 2Senior Researcher, Agric. Eng. Res. Institute, Agric.Res. Center, Dokki, Giza, Egypt. | ||||
| 3Agric. Eng., Agric. Eng. Res. Institute, Agric. Res. Center, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| In the present work, selected mathematical thin-layer drying models were fitted to experimental data using non-linear regression analysis techniques. The drying behavior was examined and simulated using four different thin layer drying models (simple, modified simple, logarithmic and two-term exponential model). An empirical equations relating the studied drying parameters with the drying constants of each model were also developed. The analysis was conducted based on the final moisture content (Mf) and the equilibrium moisture content (Me) for calculating the moisture ratio (MR). The results indicated that, both forms of different drying models equations described the drying behavior of whole figs satisfactorily as indicated by the high values of coefficient of determination (R2) and low values of standard error (SE). The studied drying models were also examined and compared for simulating the drying data obtained from the actual drying of whole figs to select the most applicable model for predicting whole figs moisture content during the drying process using the mechanical dryer The experimental data used to fit the thin-layer drying of whole figs (Ficus carica). The effect of drying air temperature and velocity on the coefficients of the best suited moisture ratio (MR) model were determined by multiple regression method. In the experimental, the air was passed through the chamber at a variety of air velocity (0.2, 0.4, 0.6 and 1 m/s), temperature (55, 65, 75 and 85 oC) and different of pretreatment of whole figs. According to the results, the reduction rate of figs moisture content was increased with the increasing of drying air temperature and air velocity in all pretreatment of whole figs. The logarithmic model equation could be considered the most proper model for describing the drying behavior of whole figs and predicting the change in moisture content. The value of (Me) for all drying models, substituting in calculating the moisture ratio showed better prediction of moisture content in comparison with value of (Mf) for all pretreatment of whole figs. | ||||
| References | ||||
|
A.O.A.C. (1985). Official Methods of Analysis, association of official analytical chemists Washington, D.C. USA.
Babalis, S. J. and V. G. Belessiotis (2004). Influence of the drying conditions on the drying constants and moisture diffusivity during thin-layer drying of figs. Journal of food Engineering 65(3): 449-458.
Doymaz. I. and M. Pala (2002). The effect of dipping pretreatment on air drying rates of the seedless grapes. Journal of food Engineering, 52, 413-417.
El-Sebaii A. A, S. Aboul-Enien, M. R. I, Ramadan, and H. G., El-Gohary, (2002). Parametric study of a solar air heater with and without thermal storage for solar drying applications. Renewable Energy;21:505–22.
Glenn, T. L. (1978). Dynamic analysis of grain drying system, Unpublished PhD. Thesis, Ohio State University, Ann Arbor, MI.
Goyal, R. K., A. R. P. Kingsly, and M. R. Manikantan, (2007). Mathematical modelling of thin layer drying kinetics of plum in a tunnel dryer . Journal of Food Engineering, 40, 219–226.
Henderson, S. M. and S. Pains (1961). Grain drying theory. 1: temperature effect on drying coefficient. J. Agric. Eng. Res. 6 (3): 169.
Inci, T. T., and P. Dursun, (2003). Modelling of drying kinetics of single apricot. Journal of Food Process Engineering, 58, 23–32.
Lewicki, P. P (1998). Some remarks on rehydration of drird foods. Journal of Food Process Engineering, 36, 81–87.
Lewis, W. K. (1921). The rate of drying of solid materials. J. of Ind. Eng. Chem. 13(5):427- 432.
Vinson, J. A. (1999). The functional food properties of figs. Cereal Foods World, 44(2), 82–87
Yagcioglu, A. (1999). Drying techniques of agricultural products. Ege. Univ., Faculty of Agriculture, Publication No:536 Bornova, Izmir, Turey (in Turkish). | ||||
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