مدل‌سازی فرایند خشک‌شدن برگ چای به‏ کمک فراصوت قدرت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی مکانیک ماشین‏های کشاورزی، دانشکدۀ کشاورزی، دانشگاه ایلام

2 کارشناس ارشد مهندسی مکانیک ماشین‏های کشاورزی

چکیده

چای از مهم‏ترین گیاهان دارویی به‏شمار می‏رود که تأثیر فراوانی در درمان بیماری‏های قلبی‌ـ‌عروقی و سرطان دارد. فرایند خشک‌شدن برگ چای با جریان هوای گرم صورت می‏گیرد که مصرف انرژی زیادی دارد. هدف از این تحقیق بررسی روند خشک‌شدن برگ چای به‏کمک پیش‏تیمار فراصوت با توان بالا است. برای این منظور از برگ چای رقم هیبرید چینی استفاده شد. آزمایش‏های پیش‌فرایند خشک‌شدن در حمامی فراصوت با توان 70 وات و بسامد 28 کیلوهرتز در 4 سطح زمان موج‏دهی 10، 20، 40 و 60 دقیقه انجام شد. نرخ تغییر محتوای رطوبتی نمونه‏ها با پنج مدل لایه‌نازک خشک‌شدن برازش شد. براساس مقدارهای ضریب تبیین، میانگین مربعات انحراف، و ریشۀ میانگین مربعات خطا، مدل پیج به‏عنوان بهترین مدل برای توصیف رفتار خشک‌شدن برگ چای به‏کمک فراصوت شناخته شد. از مدل پیشنهادشده در این تحقیق می‏توان در مدل‌سازی خشک‏کن‏های ترکیبی‌ـ‌فراصوتی استفاده کرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Modeling of high power ultrasound-assisted tea drying process

نویسندگان [English]

  • Reza Yeganeh 1
  • Razieh Babagoltabar 2
  • Adel Hosainpour 1
1 Assistant Professor, Department of Mechanical Engineering of Agricultural Machinery, Faculty of Agriculture, Ilam University
2 Master of Science, Department of Mechanical Engineering of Agricultural Machinery
چکیده [English]

Tea is one of the most important medicinal plants which have a considerable effect on the treatment of cardiovascular disease and cancer. The drying process of tea leaves is carried out by hot air flow which consumes high level energy. The aim of the recent research was to investigate the procedure of high power ultrasound-assisted drying process of tea leaves. Hybrid variety of Chinese tea was used for this target. All pre-drying process experiments were utilized in an ultrasonic bath (70 W and 28 KHz) and four levels of sonicated time (10, 20, 40 and 60 min). Five thin-layer drying models were fitted to the samples moisture ratio. Page model was found as the best to describe the behavior of ultrasound-assisted drying process of tea leaves in accordance with χ2, R2 and RMSE data. The confirmed model in this research is suitable for the simulation of ultrasound-combined drying systems.

کلیدواژه‌ها [English]

  • Tea leaves
  • Page model
  • Thin layer drying
  • Ultrasound

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سابقه مقاله

  • تاریخ دریافت: 06 دی 1393
  • تاریخ بازنگری: 12 اسفند 1393
  • تاریخ پذیرش: 08 تیر 1394

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