Author(s)

Aboubakar Compaoré^1,2*, Samuel Ouoba^1*, Kondia Honoré Ouoba^3*, Merlin Simo-Tagne², Yann Rogaume², Clément Ahouannou⁴, Alfa Oumar Dissa¹, Antoine Béré¹, Jean Koulidiati¹

¹Laboratoire de Physique et de Chimie de l’Environnement (LPCE), Ecole Doctorale Sciences et Technologie (ED-ST), Université Jo-seph KI-ZERBO, Ouagadougou, Burkina Faso.
²Laboratoire d’Etudes et de Recherche sur le Matériau Bois (LERMAB), Nancy-Université, ENSTIB, Epinal, France.
³Laboratoire des matériaux et Environnement (LA.M.E.), Ecole Doctorale Sciences et Technologie (ED-ST), Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso.
⁴Laboratory of Energetics and AppliedMechanics (LEMA), Polytechnic College of Abomey-Calavi, Abomey-Calavi University, Coto-nou, Bénin.

In the present work, the mass transfer characteristics, namely moisture diffusivity and moisture transfer coefficient of “Violet de Galmi” variety of onions were evaluated using the analytical model. Onions were dried in a single layer at different temperatures (40℃, 50℃, 60℃, and 70℃) and for a relative humidity of drying air of 20%. The results showed a reasonably good agreement between the values predicted by the correlation and the experimental observations. This model computed the Biot number, effective moisture diffusivity, and mass transfer coefficient. Effective diffusion coefficient values are obtained between 0.2578 × 10^-9 m²·s^-1 and 0.5460 × 10^-9 m²·s^-1. Mass transfer coefficients of “Violet de Galmi” onion drying vary between 3.37 × 10^-7 m·s^-1 and 13.38 × 10^-7 m·s^-1. Numbers of mass transfer Biot are found between 0.9797 and 2.9397. The activation energy E_a is 31.73 kJ·mol^-1.

“Violet de Galmi” Onion, Diffusion Coefficient, Drying Coefficient, Lag Factor

Compaoré, A. , Ouoba, S. , Ouoba, K. , Simo-Tagne, M. , Rogaume, Y. , Ahouannou, C. , Dissa, A. , Béré, A. and Koulidiati, J. (2022) A Modeling Study for Moisture Diffusivities and Moisture Transfer Coefficients in Drying of “Violet de Galmi” Onion Drying. Advances in Chemical Engineering and Science, 12, 172-196. doi: 10.4236/aces.2022.123013.