Studies on Physical and Engineering Properties of Different Varieties of Paddy for Designing a Power Operated Paddy Drum Thresher Cum Winnower

Author: Shankar Lal, S.V. Jogdand, A.K. Dave, Nitin Kumarkoumary and Lakshminath Bhadra

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Abstract

The physical properties of the paddy grain were determined by taking three varieties (Devbhog, Mahamaya and Rajeshwari) at five moisture levels (7, 10, 14, 18, and 22% db) to design the different components of the machine. The data were analyzed statistically using Completely Randomized Design (CRD). The physical properties of the paddy grain such as length, width, thickness, sphericity, terminal velocity, coefficient of friction, angle of repose, bulk density and true density were found to be increased with an increase in moisture content while the porosity decreased with increase in moisture content. The effect of moisture content on various physical properties of paddy grains; five levels of moisture content varying from 7 to 22% (d.b.) were examined. It was observed that as the moisture content increased from 7 to 22% (d.b.), there were increases in the average length Devbhog, Mahamaya and Rajeshwari paddy varieties ranged from 7.99 to 9.035 mm, the width from 2.02 to 2.63 mm, and the thickness from 1.503 to 2.1 mm, coefficient of static friction (from 0.351 to 0.419), terminal velocity (from 4.145 to 5.869 m/s), and angle of repose (from 23.014o to 32.369o. Furthermore, the bulk density and true density for Devbhog, Mahamaya and Rajeshwari paddy of the grains were found to increase from 549.44 to 628.54 kg/m³ and 937.72 to 1085.54 kg/m³, respectively, with increasing moisture content, while the porosity decreased from 45.05% to 29.287%.

Keywords

Moisture content, Paddy varieties, Width, Angle of repose, Terminal velocity

Conclusion

The physical parameters play vital role in the determination of the dimensions of the machine parts like sieve size, threshing cylinder type, cleaning system, threshing cylinder diameter as well as its length. The mean value of length of paddy varieties Devbhog, Mahamaya and Rajeshwari was observed as 8.002 mm, 8.722 mm and 9.128 mm respectively. The mean value of width of paddy varieties Devbhog, Mahamaya and Rajeshwari was measured as 2.18 mm, 2.37 mm and 2.54 mm respectively. The mean value of thickness of paddy varieties Devbhog, Mahamaya and Rajeshwari was obtained as 1.53 mm, 1.83 mm and 2.15 mm, respectively. The mean value of sphericity of paddy varieties Devbhog, Mahamaya and Rajeshwari was measured as 0.297, 0.33 and 0.357 respectively. The mean value of bulk density of paddy varieties Devbhog, Mahamaya and Rajeshwari was measured as 542.99kg/m3, 577.86kg/m3 and 650.05 kg/m3 respectively. The mean value of porosity of paddy varieties Devbhog, Mahamaya and Rajeshwari was measured as 36.06%, 39.69 % and 43.43 % respectively. The physical properties of paddy grain were significantly affected by moisture content. It was concluded that as moisture content increased, the mean values of linear dimensions (length, width, thickness, sphericity), angle of repose, coefficient of friction, and terminal velocity also increased, while bulk density, true density, and porosity decreased

References

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How to cite this article

Shankar Lal, S.V. Jogdand, A.K. Dave, Nitin Kumarkoumary and Lakshminath Bhadra (2024). Studies on Physical and Engineering Properties of Different Varieties of Paddy for Designing a Power Operated Paddy Drum Thresher Cum Winnower. Biological Forum – An International Journal, 16(8): 09-19.