با همکاری انجمن علوم و صنایع غذایی ایران

نوع مقاله : مقاله پژوهشی لاتین

نویسندگان

1 گروه مهندسی بیوسیستم، دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران.

2 گروه مهندسی بیوسیستم، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

چکیده

در این تحقیق اثر توان‌های مختلف (90، 270 و 450 وات) و دوره تابش یعنی زمان های روشن–خاموش (60/30 و 120/30 ثانیه/ثانیه) بر روی نسبت خشک شدن و صدمه دانه در خشک کردن به‌روش مایکروویو در دو رقم نعمت و هاشمی موردبررسی قرار گرفت. طبق نتایج به‌دست آمده، مدل میدیلی و همکاران بهترین پیش‌بینی را برای خشک کردن رقم نعمت در دوره 60/30 نشان داد. علاوه‌براین مدل Two-term برای رقم هاشمی در دوره‌های 60/30 و 120/30 و برای رقم نعمت در دوره 120/30 بهترین پیش‌بینی را داشت. طبق نتایج این تحقیق برای رقم هاشمی توان 270 وات و دوره 120/30 توصیه می‌شود. در این شرایط شکست دانه 1/19 درصد بود. در تمام حالات درصد شکست در رقم نعمت بالای 40 درصد بود و این نشان می‌­دهد این رقم مناسب خشک کردن با مایکروویو نیست. توصیه می‌شود یک پیش‌آزمایش قبل از انجام آزمایش‌های مایکروویو انجام شود.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of pulsation period and microwave power on paddy drying

نویسندگان [English]

  • Hassan Jafari 1
  • Davood Kalantari 1
  • Mohsen Azadbakht 2

1 Department of bio-system Engineering, Sari Agricultural Sciences and Natural Resources University (SANRU), Sari, Iran.

2 Department of Bio-system Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

چکیده [English]

In this study, the influence of different microwave powers (90, 270, and 450 W) and pulsation periods, i.e., On/Off times (30/60 and 30/120 ss-1) on drying rate and seed breakage of “Nemat” and “Hashemi” paddy varieties” was investigated. According to the results, the Midilli et al.'s model showed the best prediction accuracy for drying rate of the "Nemat" variety in the pulsation period of 30/60. Furthermore, the two-term model was found as the best model for "Hashemi" variety in the pulsation periods of 30/60 and 30/120 and for "Nemat" variety in the pulsation period of 30/120.The 270 W microwave power and 30/120 pulsation period can be recommended as a final conclusion of this study for drying “Hashemi” paddy variety. The breakage percentage at this condition was 19.1%. Breakage percent of the Nemat variety was more than 40% at all of the conducted measurements, indicating that this variety is not suitable for microwave drying. The final concluding massage of this study is that a pre-test should be conducted before applying the microwave for paddy drying.

کلیدواژه‌ها [English]

  • Microwave drying
  • breakage percent
  • Moisture ratio
  • thin layer
  • drying models
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