Pamukkale Univ Muh Bilim Derg. 2022; 28(7): 963-970 | DOI: 10.5505/pajes.2022.43247

Effect of microwave power on drying behavior and essential oil yield of microwave dried Eucalyptus camaldulensis Dehnh. leaves

Behlül Ertuðrul Þengül, Emir Tosun
Department of Chemical Engineering, Faculty of Engineering, Ýnonu University, Malatya, Turkey

In this study, the aim was to microwave dry Eucalyptus camaldulensis Dehnh. leaves, while evaluating the role of microwave power regarding drying behavior, drying rate, drying time, drying kinetics, moisture diffusivity, and essential oil yield. The leaves were dried by microwave at four different power levels (180, 360, 600 and 720 W). The results found that increasing the increment power levels decreased the time for drying and increased the drying rate. To fit the experimental data, nine widely used thin layer drying kinetics models were used. The analysis of the drying curves indicated that the Page model was the most appropriate. There was a significant difference in moisture diffusivity between 2.36×10-11 and 11.45×10-11m2/s. Increasing microwave power was led to an increase in moisture diffusivity. In accordance with the Arrhenius equation, a value of 7.4225 W/g was determined for the activation energy. In terms of specific energy consumption, the results ranged from 8.56 to 9.93 kWh/kg. When leaves were dried with a microwave power of 180 W, the maximum yield of essential oil was obtained.

Keywords: Eucalyptus leaves, Microwave drying, Thin layer drying kinetics, Mathematical modeling, Effective moisture diffusivity, Essential oil yield

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Mikrodalga gücünün mikrodalgada kurutulmuþ Eucalyptus camaldulensis Dehnh. yapraklarýnýn kuruma davranýþý ve uçucu yað verimi üzerine etkisi

Behlül Ertuðrul Þengül, Emir Tosun
Ýnönü Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliði Bölümü, Malatya

Bu çalýþmada, Okaliptüs camaldulensis Dehnh. yapraklarýnýn mikrodalga kurutulmasý bu esnada mikrodalga gücünün kuruma davranýþý, kuruma hýzý, kuruma süresi, kuruma kinetiði, nem diffüzivitesi, enerji tüketimi ve uçucu yað verimi üzerindeki etkisinin deðerlendirilmesi amaçlanmýþtýr. Yapraklar dört farklý mikrodalga güç seviyesinde (180, 360, 600 ve 720 W) kurutulmuþtur. Sonuçlar, artan güç seviyelerinin kuruma süresini azalttýðýný ve kuruma hýzýnýn arttýðýný göstermiþtir. Deneysel veriler, yaygýn olarak kullanýlan dokuz ince tabaka kurutma kinetiði modeline uydurulmuþ ve Page modelinin kurutma eðrilerine uyan en iyi model olduðu bulunmuþtur. Efektif nem diffüzivitesi 2.36×10-11 - 11.45×10-11m2/s aralýðýnda bulunmuþtur. Artan mikrodalga gücü, nem yayýlýmýnda bir artýþa yol açmýþtýr. Aktivasyon enerjisi Arrhenius denklemine göre 7.4225 W/g olarak belirlenmiþtir. Spesifik enerji tüketimi 8.56 ile 9.93 kWh/kg arasýnda deðiþmektedir. Maksimum uçucu yað verimi, 180 W mikrodalga gücünde kurutulan yapraklardan elde edilmiþtir.

Anahtar Kelimeler: Okaliptus yapraklarý, Mikrodalga kurutma, Ýnce tabaka kurutma kinetiði, Matematiksel modelleme, Etkin nem yayýlýmý, Uçucu yað verimi

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