Drying Characteristics, Specific Energy Consumption, Qualitative Properties, Total Phenol Compounds, and Antioxidant Activity During Hybrid Hot Air-Microwave-Rotary Drum Drying of Green Pea

This study is aimed to investigate the effect of a Hybrid Hot air-Microwave- Rotary Drum (HMRD)  dryer on the thermal properties, quality, and nutritional characteristics of green pea under different operational conditions. The experiments were conducted under different air temperatures (۴۰, ۵۵, and ۷۰ °C), microwave power (۹۰, ۲۷۰, ۴۵۰, and ۶۳۰ W), and drum rotation speeds (۵, ۱۰, and ۱۵ rpm). The thermal properties (e.g. drying time, effective moisture diffusion coefficient, activation energy, and specific energy consumption), quality features (color, shrinkage, and rehydration ratio), and nutritional properties (antioxidant activity and total phenol content) were determined. The results indicated that by increasing the microwave power, air temperature, and drum rotation speed, the drying time will decline. The highest diffusion coefficient and energy consumption were determined as ۵.۰۴۱۰-۱۱ m۲/s and ۱۰۹.۹۱ MJ/kg, respectively. The lowest changes in color, shrinkage, and rehydration were calculated as ۴۱.۳۴, ۲۴.۰۸%, and ۱.۵۷. The highest total phenol (۱۴.۰۲ mg GAE/g d.w) and antioxidant (۸۵.۸۶%) were obtained. Thus the newly designed dryer can be employed for drying granular products and lead to satisfactory results.

کلیدواژه ها:

Hybrid hot air-microwave- rotary drum dryer ، Quality features ، Specific energy consumption ، Antioxidant Activity ، Green pea