Effect of Shape of a Fruit Model-Product (Sodium Alginate Gel) Dryed by Microwave and Modeling of Drying Kinetics


  • Kisselmina Youssouf Kone Teacher - Researcher
  • Zohim Etienne Gnimpieba
  • Doudjo Soro
  • Nogbou Emmanuel Assidjo
  • Jean-Claude Laguerre


Microwave, model-product, alginate gel, modeling of drying


Model-products are products designed to imitate and understand the heat treatment behavior of real products. This is the case of a sodium alginate gel used to simulate the drying behavior of water-rich fruit products (e.g. tomatoes). The aim of this study was to investigate the effect of the shape of a sodium alginate gel as a model-product of microwave drying. Then, from this shape of the gel, find a semi-empirical model that simulated well its drying kinetics. Thus, a sodium alginate gel was developed in cylindrical and slab shapes, which had almost identical volumes and weights, to assess the influence of product shape on drying kinetics. Experiments were performed in a stereo-mode cavity at 2450 MHz with output microwave powers densities of 1, 1.5, and 2 W / g. A regular weighing of dried product mass was carried out to better appreciate drying behavior. In addition, the temperature at the product core was measured by an optical fiber to observe the evolution of gel temperature. The experiments showed that the cylindrical shape of the model-product dries faster than the slab shape. Moreover, the Midilli mathematical model best fit the drying kinetics of the cylindrical shape of the gel.

Author Biography

Kisselmina Youssouf Kone, Teacher - Researcher

Engineering Department of Chemistry and Food agriculture


Mayor, L., Sereno, A.M., Modelling shrinkage during convective drying of food materials: a review. J. Food Eng. 61, pp.373–386, 2004.

Skansi, D., Tomas, S., Microwave drying kinetics of a clay-plate. Ceram. Int. 21, pp.207–211, 1995.

Khairou, K.., Al-Gethami, W.., Hassan, R.., Kinetics and mechanism of sol–gel transformation between sodium alginate polyelectrolyte and some heavy divalent metal ions with formation of capillary structure polymembranes ionotropic gels. J. Membr. Sci. 209, 445–456, 2002.

Xia, Y., Zeng, Y.-P., Jiang, D., Dielectric and mechanical properties of porous Si3N4 ceramics prepared via low temperature sintering. Ceram. Int. 35, pp.1699–1703. 2009.

Cheng, W.M., Raghavan, G.S.V., Ngadi, M., Wang, N., Microwave power control strategies on the drying process I. Development and evaluation of new microwave drying system. J. Food Eng. 76, 188–194, 2006.

Wang, J., Xi, Y.S., Drying characteristics and drying quality of carrot using a two-stage microwave process. J. Food Eng. 68, pp.505–511, 2005.

Sundaram, J., Durance, T.D., Water sorption and physical properties of locust bean gum–pectin–starch composite gel dried using different drying methods. Food Hydrocoll. 22, pp.1352–1361, 2008.

Özbek, B., Dadali, G., Thin-layer drying characteristics and modelling of mint leaves undergoing microwave treatment. J. Food Eng. 83, pp.541–549, 2007.

Karaaslan, S.N., Tunçer, I.K., Development of a drying model for combined microwave–fan-assisted convection drying of spinach. Biosyst. Eng. 100, pp.44–52, 2008.

Al-Harahsheh, M., Al-Muhtaseb, A.H., Magee, T.R.A., Microwave drying kinetics of tomato pomace: Effect of osmotic dehydration. Chem. Eng. Process. Process Intensif. 48, pp.524–531, 2009.

Wang, J., Wang, J.S., Yu, Y., Microwave drying characteristics and dried quality of pumpkin. Int. J. Food Sci. Technol. 42, pp.148–156, 2007.

Doymaz, I., Akgün, N.A., Study of thin-layer drying of grape wastes. Chem. Eng. Commun. 196, pp.90–900, 2009.

O’Callaghan, J.R., Menzies, D.J., Bailey, P.H., Digital simulation of agricultural drier performance. J. Agric. Eng. Res. 16, pp.223–244, 1971.

Page, G., Factors influencing the maximum rates of air drying shelled corn in thin layers. MSc Thesis, Purdue University, Indiana, USA, 1949.

Henderson, S.M., Pabis, S., Grain drying theory I: temperature effect on drying coefficient. J. Agric. Res. Eng. 6, pp.169–174, 1961.

Yaldýz, O., Ertekýn, C., Thin layer solar drying of some vegetables. Dry. Technol. 19, pp. 583–597, 2001.

Wang, C.., Singh, R.., A single layer drying equation for rough rice. ASAE Pap. No 78-3001 ASAE St Joseph MI. 1978.

Verma, L.R., Bucklin, R.A., Endan, J.B., Wratten, F.T., Effects of Drying Air Parameters on Rice Drying Models. Trans. ASAE 28, pp.296–301, 1985.

Sharaf-Eldeen, Y.I., Blaisdell, J.L., Hamdy, M.Y., A Model for Ear Corn Drying. Trans. ASAE 23, pp.1261–1265. 1980.

Midilli, A., Kucuk, H., Yapar, Z., A new model for single-layer drying. Dry. Technol. 20, pp.1503–1513, 2002.

McMinn, W.A.M., Khraisheh, M.A.M., Magee, T.R.A., Modelling the mass transfer during convective, microwave and combined microwave-convective drying of solid slabs and cylinders. Food Res. Int. pp.36, 977–983, 2003.

Chávez-Méndez, C., Salgado-Cervanres, M.A., Garcia-Galindo, H.S., la Cmz-Medina, J.D., Garcia-Alvarado, M.., Modeling of Drying Curves for Some Foodstuffs Using a Kinetic Equation of High Order. Dry. Technol. 13, pp.2113–2122, 1995.

Diamante, L.M., Munro, P.A., Mathematical modelling of the thin layer solar drying of sweet potato slices. Sol. Energy 51, pp.271–276, 1993.

Alibas, I., Microwave, Air and Combined Microwave-Air Drying of Grape Leaves (Vitis vinifera L.) and the Determination of Some Quality Parameters. Int. J. Food Eng. 10, 2014.

Ashok, K., Neha, K., Kedarnath, Mathematical Modeling of Microwave drying kinetics of Ginger (Zingiber officinale) slices. J. Postharvest Technol. 2, pp.88–95, 2014.

Crank, J., The Mathematics of Diffusion. Oxford: Clarendon Press; 1975.

Metaxas, A.C., Foundations of electroheat: a unified approach. A unified Approach. John Wiley & Sons Edition. England. pp.311-318, 1996.

Wang, J., Sheng, K., Far-infrared and microwave drying of peach. LWT - Food Sci. Technol. 39, pp.247–255, 2006.

Doymaz, İ., Thin-layer drying behaviour of mint leaves. J. Food Eng. 74, pp.370–375, 2006.

Constant, T., Moyne, C., Perré, P., Drying with internal heat generation: Theoretical aspects and application to microwave heating. AIChE J. 42, pp.359–368, 1996.

Maskan, M., Drying, shrinkage and rehydration characteristics of kiwifruits during hot air and microwave drying. J. Food Eng. 48, pp.177–182, 2001.

Nadeau, J.-P., Puiggali, J.-R., Séchage: des processus physiques aux procédés industriels. Lavoisier TEC & DOC, Paris. 1995.

Giovanelli, G., Zanoni, B., Lavelli, V., Nani, R., Water sorption, drying and antioxidant properties of dried tomato products. J. Food Eng. 52, pp.135–141, 2002.

Hawlader, M.N.A., Uddin, M.S., Ho, J.C., Teng, A.B.W., Drying characteristics of tomatoes. J. Food Eng. 14, pp.259–268, 1991.

Zogzas, N.P., Maroulis, Z.B., Marinos-Kouris, D., Moisture Diffusivity Data Compilation in Foodstuffs. Dry. Technol. 14, pp. 2225–2253, 1996.

Simha, P., Mathew, M., Ganesapillai, M., Empirical modeling of drying kinetics and microwave assisted extraction of bioactive compounds from Adathoda vasica and Cymbopogon citratus. Alex. Eng. J. pp.55, 141–150, 2016.

Soysal, Y., Microwave Drying Characteristics of Parsley. Biosyst. Eng. 89, pp.167–173, 2004.

Gögüs, F., Maskan, M., Drying of olive pomace by a combined microwave-fan assisted convection oven. Nahrung/Food 45, pp.129–132, 2001.




How to Cite

Kone, K. Y., Gnimpieba, Z. E., Soro, D., Assidjo, N. E., & Laguerre, J.-C. (2017). Effect of Shape of a Fruit Model-Product (Sodium Alginate Gel) Dryed by Microwave and Modeling of Drying Kinetics. Asian Journal of Agriculture and Food Sciences, 5(3). Retrieved from https://www.ajouronline.com/index.php/AJAFS/article/view/4792