Abstract
The present study aimed to determine and model the physical (orthogonal axes, circularity, sphericity and apparent specific mass), thermal (thermal conductivity, specific heat and thermal diffusivity) and aerodynamic properties (thermal experimental speed) of beans grains with different water contents. BRS cultivar were used as test crop and properties were investigated with seven water contents (32.9; 28.1; 24.9; 21.9; 18.9; 16.2; 13.6% dry base- d.b.). After data collection, mathematical models were set as experimental data. At the moment of choosing the best model, the following were taken into account: the adjusted coefficient of determination (R²) and average relative error (P). The outcome analysis showed that the orthogonal axes and beans grain circularity are directly proportional to water content reduction. Apparent specific mass decreased and sphericity remained constant, with increase in water content. Thermal conductivity, specific heat and thermal diffusivity decreased by 22.7; 12.7; 14.3%, respectively, when water content decreased from 32.9 to 13.6% d.b. The experimental terminal speed was increased by 15.3% when water content increased. Key words: Size and shape, thermal conductivity, terminal speed, Phaseolus vulgaris.
Highlights
Beans (Phaseolus vulgaris L.) is a vegetable species from Fabaceae family, which is extremely important as human feed, easy to find and an important source of protein, minerals, vitamins and phenolic compounds (Díaz et al, 2010)
BRS cultivar were used as test crop and properties were investigated with seven water contents (32.9; 28.1; 24.9; 21.9; 18.9; 16.2; 13.6% dry base- d.b.)
The experimental terminal speed was increased by 15.3% when water content increased
Summary
Beans (Phaseolus vulgaris L.) is a vegetable species from Fabaceae family, which is extremely important as human feed, easy to find and an important source of protein, minerals, vitamins and phenolic compounds (Díaz et al, 2010). Its production and consumption are observed mainly in South America, The Caribbean, Central America and Africa (Luna-Vital et al, 2015), consisting of one of the most widely harvested crops in Brazil and the world (Zucareli et al, 2015). The beanstalk is cultivated in various Brazilian regions.
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