Thin layer modelling of Chenopodium ambrosioides drying process
A. Jamali*, L. Ait Mohamed, M. Aghfir, M. Kouhila, M. Rhazi
Laboratoire d’Energie Solaire et des Plantes Aromatiques et Médicinales, Ecole Normale Supérieure, BP 2400, Marrakech, Morocco.
Single layer solar drying experiments were conducted for Chenopodium ambrosioides leaves grown in Marrakech. An indirect forced convection solar dryer was used in drying the Ch. ambrosioides leaves at different conditions such as ambient air temperature (21 to 35°C), drying air temperature (45 to 60°C) with relative humidity (29 to 53%), air flow rate (0.0277 to 0.0556 m3/s) and solar radiation (150 - 920 W/m2) . The experimental drying curves showed only a falling drying rate period. In order to estimate and select the suitable form of solar drying curves, teen mathematical models were applied to the experimental data and compared according to their statistical parameters. The main factor controlling the drying rate was found to be the drying air temperature. The drying rate equation was determined empirically from the characteristic drying curve.
Keywords: Chenopodium ambrosioides; characteristic drying curve; Drying curves; Modelling; Solar drying.
Corresponding author: Pr A. Jamali, E-mail: firstname.lastname@example.org, Fax: +212 44 34 22 87