![]() ![]() ![]() Knowledge on the mechanical properties of granular biomass is important for the design and efficient operation of equipment used for handling, storage, and processing. The higher moisture corn increased subsequent particle size by 89 µm and had improved flowability as measured by CFI. In conclusion, decreasing hammermill screen size increased moisture loss by 0.55%, decreased corn particle size by 126 µm and resulted in poorer flowability as measured by percent compressibility and AOR. The increased MC of corn increased (p < 0.038) CFI and tended to decrease (p < 0.050) AOR and COD. The 14.5% moisture corn resulted in decreased (p < 0.050) particle size and an increased standard deviation compared to the 16.7% moisture corn. For the main effects of MC, 16.7% moisture corn had increased (p < 0.001) ground corn MC compared to 14.5%. ![]() Angle of repose tended to decrease (p < 0.056) when corn was ground using a 6 mm screen compared to a 3 mm screen. There was a decrease (p < 0.030) in percent compressibility as screen size increased from 3 mm to 6 mm. There was a decrease (p < 0.031) in particle size from the 6 mm screen to the 3 mm, but no evidence of difference was observed for the standard deviation. Grinding corn using a 3 mm screen resulted in decreased (p < 0.041) moisture content compared to corn ground using the 6 mm screen. There was no evidence for a screen size × corn moisture interaction for ground corn moisture content (MC), particle size, standard deviation, or flowability metrics. ![]() Ground corn flowability was calculated using angle of repose (AOR), percent compressibility, and critical orifice diameter (COD) measurements to determine the composite flow index (CFI). Corn was ground using a lab-scale 1.5 HP Bliss Hammermill at three separate timepoints to create three replications per treatment. Treatments were arranged as a 2 × 2 factorial design with two moisture concentrations (14.5 and 16.7%), each ground using 2 hammermill screen sizes (3 mm and 6 mm). The objective of this study was to determine the effects of whole-corn moisture and hammermill screen size on subsequent ground corn moisture, particle size and flowability. Shear test was conducted to determine the coefficient of friction between the steel plate and corn stover grind at different moisture content and normal pressure. Mechanical properties such as compressibility, initial bulk modulus, porosity index and particle stiffness were determined from a pressure-density data. Compression test was conducted for each combination of hammer mill screen size and moisture content to establish pressure-density data at different applied pressures. Mechanical properties of corn stover grind such as particle size distribution, bulk and particle densities, compressibility, particle stiffness, wall friction and adhesion on steel surface were determined with two hammer mill screen sizes (3.18 and 6.35 mm) used in grinding at three different moisture contents (7, 11, 15% w.b). Mechanical properties of corn stover grind are important because of the need for accurate input data in the mathematical modeling of densification process and the design of densification equipment. ![]()
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