خشک کردن ذرت در یک خشک‌کن آزمایشگاهی بستر سیال- فراصوت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجو ارشد دانشگاه شیراز، بخش مهندسی بیوسیستم

2 دانشیار، بخش مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه شیراز

3 دانشجوی دکتری، بخش مهندسی بیوسیستم دانشکده کشاورزی دانشگاه شیراز

چکیده

تاکنون چنـدین مطالعه درباره تجهیز خشـک­کن بستر سیال با رویکرد افزایش بازده و بهبود عملکرد انجـام شده  است  [f1] که به منظور تحقق این هدف ترکیب آن با تجهیزات فراصوت توان بالا می تواند مناسب باشد. هدف اصلی این پژوهش در این مطالعه به بررسی تاثیر فراصوت توان بالا بر روی خشک­کن آزمایشی بستر سیال در خصوص مدت زمان خشک کردن و خصوصیات کیفی مکانیکی ذرت است که در سه [f2] سطح توان فراصوت (1/11، 6/14 و 78/17 /18 کیلووات بر مترمکعب)، چهار سطح فرکانس (20، 25، 28 و 30 کیلوهرتز) و سه سطح دمای (40، 50 و 60 درجه سلسیوس) به منظورکاهش رطوبت اولیه از مقدار اولیه 5/0± 32 درصد به رطوبت نهایی 5/0± 17 درصد (% d. b.) به آن پرداخته شده است. نتایج نشان داد در پایین ترین سطح دمایی، فرکانس 25 کیلوهرتز و توان 6/14 کیلووات بر مترمکعب موثرترین ترکیب از نظر زمان خشک کردن در میان تیمارهای آزمایش  بوده است. این ترکیب در مقایسه با حالت بدون فراصوت، زمان نهایی خشک شدن را 43 درصد کاهش داد و فراصوت به جهت دلیل ایجاد پدیده اسفنجی کردن  در محصول، موجب کاهش نیروی شکستمقاومت فشاری نهایی و چقرمگی گردید. نتایج نشان داد که انرژی چقرمگی در مقایسه با نیروی شکستمقاومت فشاری نهایی شاخص مناسب تری برای مشخص کردن مقاومت شکست دانه می­باشد.



 [f1]کامنت داور محترم دوم :
حذف شود. ضرورتی ندارد
 
پاسخ به داور محترم :
اهمیت و ضرورت این تحقیق افزایش بازده و بهبود عملکرد خشک کن بستر سیال است که جهت تحقق این اهداف از تکنولوژی نوین فراصوت استفاده شد( با توجه به تحقیقات پیشینی که توسط زارع و همکاران از سال های 2006 تا 2016 انجام شد). به همین جهت با حذف این قسمت، اهمیت و ضرورت تحقیقی که ذکر فرمودید در چکیده اشاره گردد حذف شده و چکیده ناقص میگردد.




 [f2]کامنت داور محترم دوم :
جمله بندی ایراد دارد
 
پاسخ به کامنت داور محترم : تغییرات لازم اعمال گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Corn Drying in a Laboratory Scale Ultrasound-Assisted Fluidized Bed Dryer

نویسندگان [English]

  • Bahareh Abdoli 1
  • Darush Zare 2
  • Arash Nourmohamadi-Moghadami 3
1 Graduate, Biosystems Engineering Department, College of Agriculture, Shiraz University, Shiraz
2 Associate Professor, Biosystems Engineering Department, College of Agriculture, Shiraz University, Shiraz
3 Ph.D. Candidate, Biosystems Engineering Department, College of Agriculture, Shiraz University, Shiraz
چکیده [English]

Several studies have been conducted on equipping conventional fluidized bed with some technologies to increase drying efficiency and its performance. The objective of the study was to investigate the influence of high power ultrasound on fluidized bed drying of corn in terms of drying kinetics and quality characteristics of corn in three levels of ultrasound power density (11.1, 14.6 and 18.7 kW m-3), three levels of drying air temperature (30, 40, and 50 ºC) and four levels of frequency (20, 25, 28, and 30 kHz) in which the moisture content reduced from 32±0.5 (%d.b.) to 17±0.5 (%d.b.). Results revealed that the frequency of 25 kHz was the most efficient in terms of drying time. The frequency of 25 kHz and power density 14.6 kw m-3 was the most efficient frequency and caused reduction of the drying time by 43% in comparison with no ultrasound condition (control). The sponge effect caused by ultrasound application led to reduction of failure strength and toughness of the dried samples. According to the results, toughness compared to the failure strength was an appropriate index of the grain hardness.

کلیدواژه‌ها [English]

  • Quality attributes
  • high power ultrasound
  • ultrasound transducer
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 [f1]کامنت داور محترم دوم : چه دانشکده ای؟ چه گروهی؟
 
پاسخ به داور محترم : مطابق با فرمت رفرنس نویسی مجله است.