Engineering Properties of Monodora Tenuifolia Seeds as Influenced by Moisture Content
Keywords:
Monodora tenuifolia seed, Moisture content, Engineering propertiesAbstract
Some engineering properties of Monodora tenuifolia seeds were investigated as a function of moisture content. Within the moisture range considered (10.75–16.23% w.b), the major, intermediate and minor diameters of M. tenuifolia seeds were in the range of 14.57–14.65 mm, 9.93–10.17 mm and 7.43–7.90 mm, respectively. The geometric mean diameter, unit weight, volume, sphericity and terminal velocity were in the range of 10.21–10.53 mm, 0.43–0.48 g, 560.60–615.12 mm3, 0.70–0.72 and 10.6–12.87 m/s, respectively. Porosity, bulk and true density were in the range of 0.36–0.42, 0.49–0.52 g/cm3 and 0.82–0.85 g/cm3, respectively. The coefficient of static friction varied from 0.33 to 0.43 over four different structural surfaces and the angle of repose of the seed were between 26.65° and 31.37°. Specific heat values were in the range of 12.29–16.07 J/gK, 4.86–5.95 J/gK, and 3.34–4.14 J/gK, for the seeds and 10.43–16.28 J/gK, 4.85–5.66 J/gK, and 3.72–4.37 J/gK, for the kernels at temperatures 40, 60 and 80°C respectively. As moisture content increases, the rupture force, rupture energy and deformation of M. tenuifolia seed varied from 47.36–68.40 N, 0.03–0.06 J and 1.01–1.64 mm, during vertical loading and 326.80–469.44 N, 1.69–2.29 mm and 0.30–0.47 J, during horizontal loading respectively. The effect of moisture content on the properties considered was significant (p<0.05) and the regression models adequately expressed the relationships existing between the properties of M. tenuifolia seeds and moisture content.
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