摘要
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<sup>-9</sup> m<sup>2</sup>·s<sup>-1</sup> and 0.5460 × 10<sup>-9</sup> m<sup>2</sup>·s<sup>-1</sup>. Mass transfer coefficients of “Violet de Galmi” onion drying vary between 3.37 × 10<sup>-7</sup> m·s<sup>-1</sup> and 13.38 × 10<sup>-7</sup> m·s<sup>-1</sup>. Numbers of mass transfer Biot are found between 0.9797 and 2.9397. The activation energy E<sub>a</sub> is 31.73 kJ·mol<sup>-1</sup>.
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<sup>-9</sup> m<sup>2</sup>·s<sup>-1</sup> and 0.5460 × 10<sup>-9</sup> m<sup>2</sup>·s<sup>-1</sup>. Mass transfer coefficients of “Violet de Galmi” onion drying vary between 3.37 × 10<sup>-7</sup> m·s<sup>-1</sup> and 13.38 × 10<sup>-7</sup> m·s<sup>-1</sup>. Numbers of mass transfer Biot are found between 0.9797 and 2.9397. The activation energy E<sub>a</sub> is 31.73 kJ·mol<sup>-1</sup>.
作者
Aboubakar Compaoré
Samuel Ouoba
Kondia Honoré Ouoba
Merlin Simo-Tagne
Yann Rogaume
Clément Ahouannou
Alfa Oumar Dissa
Antoine Béré
Jean Koulidiati
Aboubakar Compaoré;Samuel Ouoba;Kondia Honoré Ouoba;Merlin Simo-Tagne;Yann Rogaume;Clément Ahouannou;Alfa Oumar Dissa;Antoine Béré;Jean Koulidiati(Laboratoire de Physique et de Chimie de l’Environnement (LPCE), Ecole Doctorale Sciences et Technologie (ED-ST), Université Jo-seph KI-ZERBO, Ouagadougou, Burkina Faso;Laboratoire d’Etudes et de Recherche sur le Matériau Bois (LERMAB), Nancy-Université, ENSTIB, Epinal, France;Laboratoire des matériaux et Environnement (LA.M.E.), Ecole Doctorale Sciences et Technologie (ED-ST), Université Joseph KI-ZERBO, Ouagadougou, Burkina Faso;Laboratory of Energetics and AppliedMechanics (LEMA), Polytechnic College of Abomey-Calavi, Abomey-Calavi University, Coto-nou, Bénin)
