Experimental Assessment of Energy and Mass Transfer in Microwave Drying of Fig Fruit
- سال انتشار: 1394
- محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 17، شماره: 7
- کد COI اختصاصی: JR_JASTMO-17-7_004
- زبان مقاله: انگلیسی
- تعداد مشاهده: 123
نویسندگان
Department of Mechanical engineering of biosystems, Faculty of Agriculture, Urmia University, Urmia, Iran.
Department of Mechanical engineering of biosystems, Faculty of Agriculture, Urmia University, Urmia, Iran.
Department of Mechanical engineering of biosystems, Faculty of Agriculture, Urmia University, Urmia, Iran.
Department of Mechanical engineering of biosystems, Faculty of Agriculture, Urmia University, Urmia, Iran.
چکیده
Energy and mass transfer investigations in thermal processing of fruits serve as a breakthrough in the design and scale up of drying systems. Diffusivity characteristics and specific energy consumption for drying of fig fruit in a laboratory scale microwave dryer were assessed. Several intervals for microwave power intensity including ۰.۵, ۱, ۱.۵, ۲, and ۲.۵ W g-۱, and ۶ levels of power on-off stated as pulsing ratios of ۱.۵, ۲, ۲.۵, ۳, ۳.۵, and ۴ were employed. The results showed that the drying rate decreased with the pulsing ratio and increased with microwave power intensity. Effective moisture diffusivity as an indicator of mass transfer was obtained to be higher at elevated microwave power intensities. Also, increased pulsing ratios had a reducing effect on moisture diffusivity. Using ۲nd law of Fick, moisture diffusivity was calculated to be varying from ۵.۹۳E-۱۰ to ۱.۴۲E-۰۸ m۲ s-۱ depending on the experimental conditions. Furthermore, the activation energy of fig fruit was obtained to be in the range of ۶۰.۰۹۴ to ۹۲.۱۸۹ kJ mol-۱. Specific energy consumption variations showed a positive correlation with pulsing ratio and drying time. However, due to the dependence of energy consumption on MW power intensity, a multiple regression analysis with R۲ of ۰.۹۶۸ was developed.کلیدواژه ها
Activation Energy, Diffusivity, Pulsed drying, Specific energy consumptionاطلاعات بیشتر در مورد COI
COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.
کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.