Simulation of Tef Seed Broadcasting

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A. Zewdu Simulation of Tef Seed Broadcasting. Agricultural design transnational:
the CIGR Ejournal. Manuscript PM 07 027. Vol. X. December, 2008.
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Simulation of Tef Seed Broadcasting
A.D. Zewdu
School of Engineering and Information Technologies, PO Box 1888, Adama, Ethiopia
Tel: +251 911 828912/500267, Email: zewdu.abdi@adama-university.net
ABSTRACT
In this probe broadcast seminal fluiding of tef seed was considered. In order to predict tinge
flight on and off record book, after developing a mathematical relationship, simulation of particle
movement on and off disc of a spinning disc was undertaken. The terminal velocity and
coefficient of drag promote of tef seed were determined experimentally in laboratory. Projected
distance of particle thrown off the disk was calculated by alter different particle property
(such as wet content, coefficient of friction, TGM and particle density) and machine
parameters (such as cone angle and angular velocity). The projected distance of a particle
increased with increase in moisture content of seed, broadcaster revolution per minute and
inclination of disc with the horizontal.



The increase in moisture content was associated with
increase in coefficient of friction, which do cave in effect on-the disc particle motion. The
increase in moisture content has influence also on thousand grain mass, particle size,
sphericity, particle density and coefficient of drag force which stirred off-disc particle
trajectory. This investigation showed the possibility of using a spinning disc spreader in order
to broadcast tef seed, which could replace broadcasting of tef seed by hand manually.
Broadcasting using spreaders resembles the farmers practice, which use manual broadcasting
of seeds unlike seed drills, which involves rows.
Keywords: tef, broadcast seeding, modelling, simulation, particle trajectory, spinning disc
1. INTRODUCTION
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