Renewable Energy, Vol.153, 67-73, 2020
Ultrasonically improved convective drying of peppermint leaves: Influence on the process time and energetic indices
The aim of the present work was to assess the influence of high-intensity airborne ultrasound application on duration and energetic performance of hot air drying of peppermint leaves. To this end, drying experiments were conducted at constant air flow rate of 1 m s(-1) and different temperatures (40, 50, 60 and 70 degrees C) without and with application of ultrasound power (90, 180, 270 and 360 W). The results showed that the maximum (170.84 MJ kg(-1)) and the minimum (63.36 MJ kg(-1)) specific energy consumptions belonged to convective drying at temperature of 40 degrees C and ultrasonic-assisted drying at 60 degrees C and 270 W, respectively. Energy efficiency varied from 1.41 to 3.69%. Depending on the power level, application of the ultrasound power at the air temperatures less than 70 degrees C reduced drying time and improved energetic performance of the process. The obtained findings in this research declare that acoustic power could be effectively used in combination with convective dryers to reduce duration and energy required for drying of heat-sensitive products. (C) 2019 Published by Elsevier Ltd.