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Ultrasonically improved convective drying of peppermint leaves: Influence on the process time and energetic indices

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  • Ghanbarian, Davoud
  • Torki-Harchegani, Mehdi
  • Sadeghi, Morteza
  • Pirbalouti, Abdollah Ghasemi

Abstract

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 °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 °C and ultrasonic-assisted drying at 60 °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 °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.

Suggested Citation

  • Ghanbarian, Davoud & Torki-Harchegani, Mehdi & Sadeghi, Morteza & Pirbalouti, Abdollah Ghasemi, 2020. "Ultrasonically improved convective drying of peppermint leaves: Influence on the process time and energetic indices," Renewable Energy, Elsevier, vol. 153(C), pages 67-73.
    • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:67-73
    DOI: 10.1016/j.renene.2019.10.024
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    References listed on IDEAS

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    1. Tohidi, Mojtaba & Sadeghi, Morteza & Torki-Harchegani, Mehdi, 2017. "Energy and quality aspects for fixed deep bed drying of paddy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 70(C), pages 519-528.
    2. Torki-Harchegani, Mehdi & Ghanbarian, Davoud & Ghasemi Pirbalouti, Abdollah & Sadeghi, Morteza, 2016. "Dehydration behaviour, mathematical modelling, energy efficiency and essential oil yield of peppermint leaves undergoing microwave and hot air treatments," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 407-418.
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    1. Wang, Hui & Torki, Mehdi & Taherian, Arian & Beigi, Mohsen & Xiao, Hong-Mei & Fang, Xiao-Ming, 2023. "Analysis of exergetic performance for a combined ultrasonic power/convective hot air dryer," Renewable and Sustainable Energy Reviews, Elsevier, vol. 185(C).

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