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Demissie Boset, Lemi, Abdi Debele, Zewdu, Wako Koroso, Amana. (1404). Experimental Investigation of Minimum Fluidization Velocity and Pressure Drop in Fluidized Bed of Teff Grain. هنرهای کاربردی, 12(2), 323-333. doi: 10.22075/jhmtr.2025.35810.1632
Lemi Demissie Boset; Zewdu Abdi Debele; Amana Wako Koroso. "Experimental Investigation of Minimum Fluidization Velocity and Pressure Drop in Fluidized Bed of Teff Grain". هنرهای کاربردی, 12, 2, 1404, 323-333. doi: 10.22075/jhmtr.2025.35810.1632
Demissie Boset, Lemi, Abdi Debele, Zewdu, Wako Koroso, Amana. (1404). 'Experimental Investigation of Minimum Fluidization Velocity and Pressure Drop in Fluidized Bed of Teff Grain', هنرهای کاربردی, 12(2), pp. 323-333. doi: 10.22075/jhmtr.2025.35810.1632
Demissie Boset, Lemi, Abdi Debele, Zewdu, Wako Koroso, Amana. Experimental Investigation of Minimum Fluidization Velocity and Pressure Drop in Fluidized Bed of Teff Grain. هنرهای کاربردی, 1404; 12(2): 323-333. doi: 10.22075/jhmtr.2025.35810.1632

Experimental Investigation of Minimum Fluidization Velocity and Pressure Drop in Fluidized Bed of Teff Grain

Journal of Heat and Mass Transfer Research
دوره 12، شماره 2 - شماره پیاپی 24، بهمن 2025، صفحه 323-333    اصل مقاله (778.29 K)
نوع مقاله: Full Length Research Article
شناسه دیجیتال (DOI): 10.22075/jhmtr.2025.35810.1632
نویسندگان
Lemi Demissie Boset* 1؛ Zewdu Abdi Debele2؛ Amana Wako Koroso1
1School of Mechanical, Chemical, and Material Engineering, Adama Science and Technology University, Adama, Oromia, 0000, Ethiopia
2Faculty of Agriculture, University of Eswatini, Luyengo, Eswatini, M205, Eswatini
تاریخ دریافت: 15 آبان 1403،  تاریخ بازنگری: 06 فروردین 1404،  تاریخ پذیرش: 07 اردیبهشت 1404 
چکیده
Gas-fluidization characteristics of teff grain are crucial for understanding its behavior under gas flow, enabling it to act like a fluid, which is vital for pneumatic conveying systems. Key parameters include the minimum fluidization velocity and the pressure drop across the fluidized bed, which reflect the interaction between gas and grains. These characteristics are essential for selecting the appropriate phase of the pneumatic conveying system, ultimately improving the processing and handling of teff grain. Air retention capabilities are significant indicators of a material's suitability for dense-phase conveying. Gas fluidized bed tests were performed to evaluate the bulk flow behavior of teff grain for both dilute and dense-phase pneumatic conveyors. Results indicated that teff grain has poor air retention, evidenced by bubble formation at low airflow rates, suggesting it is more suitable for dilute-phase conveying. Experiments measured the minimum fluidization air velocity and pressure drop per bed height using a CEL-MKII apparatus at various airflow rates. Experimental studies revealed that bubbles form in the fluidized bed at the minimum superficial gas velocity, with a pressure drop ranging between 100 mbar/m and 107 mbar/m and a minimum fluidization velocity of 0.56 m/s and 0.575 m/s. These findings guide the design of effective drying and pneumatic conveying systems for teff grain.
کلیدواژه‌ها
Minimum fluidization velocity؛ Pressure drop؛ Pneumatic conveyor؛ Drying؛ Teff grain
عنوان مقاله [English]
بررسی تجربی حداقل سرعت سیال شدن و افت فشار در بستر سیال دانه تف
چکیده [English]
ویژگی‌های سیال‌سازی گاز دانه تف برای درک رفتار آن در جریان گاز بسیار مهم است و آن را قادر می‌سازد مانند یک سیال عمل کند که برای سیستم‌های انتقال پنوماتیک حیاتی است. پارامترهای کلیدی عبارتند از حداقل سرعت سیال شدن و افت فشار در سراسر بستر سیال، که منعکس کننده تعامل بین گاز و دانه ها است. این ویژگی ها برای انتخاب فاز مناسب سیستم انتقال پنوماتیک و در نهایت بهبود پردازش و جابجایی دانه تف ضروری است. قابلیت های نگهداری هوا شاخص های قابل توجهی از مناسب بودن یک ماده برای انتقال فاز متراکم هستند. آزمایشات بستر سیال گاز برای ارزیابی رفتار جریان فله دانه تف برای هر دو نوار نقاله پنوماتیک فاز رقیق و متراکم انجام شد. نتایج نشان داد که دانه تف دارای احتباس هوای ضعیفی است، که با تشکیل حباب در نرخ‌های جریان هوا کم نشان می‌دهد، که نشان می‌دهد برای انتقال فاز رقیق مناسب‌تر است. آزمایش‌ها حداقل سرعت هوای سیال شدن و افت فشار را در هر ارتفاع بستر با استفاده از دستگاه CEL-MKII در نرخ‌های جریان هوای مختلف اندازه‌گیری کردند. برای رقم Boset (DZ-Cr-409) با محتوای رطوبت (9٪ -16%)، حداقل سرعت سیال شدن بین 0.57-0.62 متر بر ثانیه و افت فشار از 102.61-106.25 میلی‌بار بر متر متغیر بود، در حالی که برای رقم فلاگوت (DZ-Cr-442 RIL77C) با رطوبت (8%-14%)، مقادیر 0.53-0.57 m/s و 100.4-101.72 mbar/m. این یافته ها طراحی سیستم های خشک کن و انتقال پنوماتیک موثر برای دانه تف را راهنمایی می کند
کلیدواژه‌ها [English]
حداقل سرعت سیال شدن افت فشار, نوار نقاله پنوماتیک, خشک کردن, دانه تف
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