STUDY ON PHYSICAL AND ENGINEERING PROPERTIES FOR GRAINS OF SOME FIELD CROPS

El Fawal, Y.A.; Tawfik, M.A.; El Shal, A.M.

doi:10.21608/mjae.2009.107579

STUDY ON PHYSICAL AND ENGINEERING PROPERTIES FOR GRAINS OF SOME FIELD CROPS

Document Type : Original Article

Authors

¹ Researcher, Agric. Eng. Res. Inst., Giza, Egypt.

² Lecturer, Agric. Eng. Dept. Fac. of Agric., Zagazig Univ., Egypt.

10.21608/mjae.2009.107579

Abstract

The present study aimed to determine and recognize a database of physical and engineering properties of grains of some main and popular feed, industrial crops which play an important role in designing and developing of specific machines and their operations such as planting, harvesting and grading .The studied crops namely fennel flower, rice (Giza101), rice (Giza 177), broad bean, corn (hyb. 310), corn (hyb. 352), wheat (Giza9) and wheat (Giza 168)and their selection based on their recent coverage area and the expected future expansion of each variety. Various physical properties including grain dimensions (length, width and thickness), the weight of thousand grain, bulk density, percent of sphericity, projected area , and the mechanical properties including angle of repose and coefficient of friction, in addition to the aerodynamic properties including terminal velocity, drag coefficient and Reynold's number, were determined at storage moisture content 7–12%(wb).The obtained data showed that it is recommended to use the stainless steel or galvanized iron in manufacturing of seed hopper used in planting machines, silos and storage containers with sides inclination of 40^○ to allow an easily sliding for the studied grains.. The physical properties of seed play an important role to select the proper separating and cleaning equipment and the main dimensions are considered in selecting and designing the suitable size of the screen perforations. Also, the average terminal velocities of grains were 4.17, 7.32, 7.02, 20.16, 15.34, 14.69, 8.00 and 7.58 m/s for fennel flower, rice (Giza101), rice (Giza 177), broad bean, corn (hyb. 310), corn (hyb. 352), wheat (Giza9) and wheat (Giza 168) respectively. Reynold's number of the terminal velocities of the studied grains exceeds the critical velocity of Reynold's number (RN=2100) in the range of turbulent flow except the fennel flower seeds.

Main Subjects

Processing Engineering of Agricultural Products

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