Physical characterisation and development of mass and volume models for tannia (Xanthosoma sagittifolium) cormels
Physical characterisation and mass and volume models for tannia cormels
Abstract
Physical properties of agricultural products are important for proper mechanization of their processing and handling operations. Models established based on these physical properties can also help in systems automation and ensure efficient processing. This study determined some physical characteristics of tannia cormel and developed mathematical models for estimating its mass and volume using its geometrical attributes. Linear dimensions were within the range 20.87-168.30 mm while the projected areas were within the range 4.63-207.72 cm2. Average mass, volume and density were within ranges 7.40-256.80 g, 7.00-215.00 cm3 and 947.37-1565.45 kg/m3 respectively. Average sphericity, aspect ratio, shape index, eccentricity and elongation ratio were 0.73, 0.60, 1.84, 0.76 and 1.81 respectively. The results showed that tannia cormels are closer to being prolate spheroid in shape with relatively high sphericity. The results showed that mass and volume of tacca cormel can be reliably predicted using its projected areas and volume (for mass modelling only). The most suitable of all the models was obtained for mass model with respect to volume (R2 = 0.976). Data provided in this study are useful in the development of postharvest handling and processing systems for tannia cormels.
