| Analysis of mass and heat transfer of willow leaves during drying with ultrasound pretreatment in an infrared dryer |
| Paper ID : 1178-NICAME1402 |
| Authors: |
|
Sasan Keramat1, Faroogh Sharifian *2, Ayda Naghali3 1Department of Biosystems Mechanical Engineering, Faculty of Agriculture, Urmia
University, Urmia, Iran 2Urmia University, Urmia, Iran 3department of biosystem engineering, agriculture faculty,Urmia university, Urmia, Iran |
| Abstract: |
| The weeping willow leaf plant possesses formidable antiseptic properties, attributed to its antibacterial, antimicrobial, and anti-inflammatory components. The selection of an appropriate approach for drying plant organs is a crucial aspect of post-harvest operations. Infrared drying method yields superior quality products due to its rapid drying capabilities, lower energy consumption, and better temperature regulation. This study utilizes ultrasound technology as a pretreatment for drying. The effective coefficient diffusion values in the dried samples varied between 8.925 × 10-7 to 3.497 × 10-6 m.(s2) -1 at different temperatures, where the highest penetration coefficient was observed at 50 ℃ with ultrasonic pretreatment for 10 minutes and the lowest penetration coefficient was observed at 40 ℃ without any pretreatment. The endothermic process was indicated by a positive enthalpy change, while a negative entropy indicated changes in the composition of willow leaves during the drying process. The Gibbs free energy increased with a rise in temperature. Drying of the willow leaf resulted in an increase in the amount of chlorophyll, which can be attributed to the reduction in leaf surface and the proximity of chlorophyll molecules to each other on the leaf surface, indicating the removal of water present on the leaf surface. |
| Keywords: |
| weeping willow , infrared, ultrasound, moisture effective diffusion coefficient, thermodynamic properties |
| Status : Paper Accepted (Poster Presentation) |
