Physical and Mechanical Properties of Alfalfa Grind as Affected by Particle Size and Moisture Content
محل انتشار: مجله علوم و فناوری کشاورزی، دوره: 14، شماره: 1
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 55
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شناسه ملی سند علمی:
JR_JASTMO-14-1_006
تاریخ نمایه سازی: 1 آذر 1402
چکیده مقاله:
Physical and mechanical properties of alfalfa (Medicago sativa, L.) grind are required for optimum design of equipment used in transporting, processing and storage of the material. This study was conducted to determine the effect of particle size (۲.۳۸, ۳.۳۶ and ۴.۷۶ mm) and moisture content (۸, ۹.۳ and ۱۱% wb) on some physical and mechanical properties of alfalfa grind. These properties include: geometric mean diameter, bulk density, coefficient of static friction (on galvanized iron, Plexiglass, rubber and polished steel surfaces), filling angle of repose, coefficient of internal friction, cohesion, and adhesion to polished steel plate. The bulk density varied from ۱۶۱.۶ to ۲۰۲.۲ kg m-۳. The coefficient of static friction changed from ۰.۲۶ on polished steel plate to ۰.۸۷ on rubber surface. Larger particles with higher moisture content had the highest filling angle of repose (۵۴.۵°). The coefficient of internal friction varied from ۰.۶۴ to ۰.۸۸. The ۲.۳۸-mm alfalfa grind at moisture content of ۱۱% (wb), and the ۴.۷۶-mm at moisture content of ۸% (wb) had the highest and lowest cohesion (۷.۶۵ and ۴.۸۰ kPa), respectively. The adhesion on polished steel plate varied from ۰.۱۹ to ۱.۵۴ kPa.
کلیدواژه ها:
نویسندگان
Z. Ghorbani
Department of Farm Machinery, College of Agriculture, Isfahan University of Technology, P. O. Box: ۸۴۱۵۶-۸۳۱۱۱, Isfahan, Islamic Republic of Iran.
A. Hemmat
Department of Farm Machinery, College of Agriculture, Isfahan University of Technology, P. O. Box: ۸۴۱۵۶-۸۳۱۱۱, Isfahan, Islamic Republic of Iran.
A. A. Masoumi
Department of Farm Machinery, College of Agriculture, Isfahan University of Technology, P. O. Box: ۸۴۱۵۶-۸۳۱۱۱, Isfahan, Islamic Republic of Iran.