Volume 8, Issue 2, June 2019, Page: 34-44
Drying Kinetics of Tomato, Okra, Potato and Mango in a Forced-Convective Solar Tunnel Dryer
Moussa Na Abou Mamouda, Energy-Environment Development (ENDA Energy, Niger), Niamey, Niger; Laboratory of Energetics, Electronics, Electro Technics, Automatics and Industrial Computer Sciences, Abdou Moumouni University, Niamey, Niger
Madougou Saïdou, Laboratory of Energetics, Electronics, Electro Technics, Automatics and Industrial Computer Sciences, Abdou Moumouni University, Niamey, Niger
Boukar Makinta, Laboratory of Energetics, Electronics, Electro Technics, Automatics and Industrial Computer Sciences, Abdou Moumouni University, Niamey, Niger
Received: May 23, 2019;       Accepted: Jun. 26, 2019;       Published: Jul. 8, 2019
DOI: 10.11648/j.ijrse.20190802.12      View  12      Downloads  9
Abstract
The design of a solar drier requires detailed information about drying kinetics of the products to be dried. The objective of our work is to characterize drying kinetics of tomato, okra, potato and mango and calculate the main drying parameters namely the drying rate, the moisture ratio and the effective diffusivity from the derivative form of the Fick’s second law of diffusion. We found that solar drying of tomato, okra, potato and mango occur in both constant and falling-rate phases. Sound experimental conditions and specifically continuous measurements and data collection during experiments, emerged as a major factor allowing the observation of both a constant-rate and falling-rate phases. Two models namely the Henderson & Pabis Model and the Page Model were used to characterize the evolution of moisture ratios (MR) over time. For each of the abovementioned crops, the Page Model appeared to give a better description of MR = f(t) with χ2 varying from 0.0051 to 0.0978. As per the Effective Moisture Diffusivity, its values were 8.866×10-09, 4.651×10-09, 4.969×10-09 and 5.177×10-09 for mango, tomato, potato and okra respectively. Calculated drying constants were compared with the ones obtained by other authors in similar experimental conditions. The experimental dryer we used was a forced convective solar tunnel dryer. All experimentations were conducted in Niamey (Niger) from 7 to 9 June 2018, 3 to 4 Mars 2019, 24 to 26 April 2018 and 1 to 3 May 2018 for mango, tomato, potato and okra respectively.
Keywords
Solar Dryer, Mango, Okra, Tomato, Potato, Drying Kinetics, Niger
To cite this article
Moussa Na Abou Mamouda, Madougou Saïdou, Boukar Makinta, Drying Kinetics of Tomato, Okra, Potato and Mango in a Forced-Convective Solar Tunnel Dryer, International Journal of Sustainable and Green Energy. Vol. 8, No. 2, 2019, pp. 34-44. doi: 10.11648/j.ijrse.20190802.12
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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