Desorption Isotherms of Dioscorea Schimperiana (Hairy Yam): An Experimental and Modeling Approach


Authors : Fabien Akana Tsopmo; Yvan ArmelKom; Jean Claude Damfeu; Yimen Nacer; Brillant Djomsi W; AbrahamKanmogne; J.R. Lucien Meva’a ; B. GAGA Dadi

Volume/Issue : Volume 7 - 2022, Issue 8 - August

Google Scholar : https://bit.ly/3IIfn9N

Scribd : https://bit.ly/3AUgZLR

DOI : https://doi.org/10.5281/zenodo.7036559

Several scientific types of research have already been carried out on yam tuber varieties of the Dioscorea family such as Dioscorea Retundata, and Dioscorea Alata. We can mention among others: the determination of sorption isotherms, their isosteric heat, and the drying kinetics. Dioscorea Schimperiana is also a tuber belonging to the same family and is currently a very popular foodstuff in the West Cameroon region. This plant, considered a nutritional element, also has several therapeutic virtues. However, the lack of knowledge of some of its thermophysical properties, especially the water content at equilibrium, is a hindrance to its optimal use. The present study, therefore, focuses on the determination of desorption isotherms, which could be useful for the modeling of a suitable dryer for the drying of Dioscorea Schimperiana. These desorption isotherms are obtained by the static gravimetric method, in the range of relative humidity from 11 to 97% and temperatures of 30°C, 40°C, and 50°C. The Henderson, Harkings and Jura, Halsey, modified Oswin, and GAB models were used for smoothing the experimental points. The isotherms obtained are of type II and characterized by a sigmoidal shape. The best fits were obtained for the GAB and Henderson equations.

Keywords : Dioscorea Schimperiana, water content, the isotherm of desorption, relative humidity, GAB, Henderson

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