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Physical Properties of Cassava Grits before and after Pneumatic Drying
Author(s) -
Romuli Sebastian,
Abass Adebayo,
Müller Joachim
Publication year - 2017
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/jfpe.12397
Subject(s) - particle density , particle size , bulk density , angle of repose , porosity , terminal velocity , moisture , particle size distribution , water content , homogeneity (statistics) , composite material , materials science , mathematics , chemistry , soil science , environmental science , physics , mechanics , plasma , geotechnical engineering , statistics , engineering , soil water , quantum mechanics
Particle characteristics are crucial knowledge to improve the process chain of cassava flour. Wet and dry grits, as the intermediate products, were investigated in this study. With respect to particle size, wet grits were predominately (66.7%) obtained between mesh size 0.50 and 1.00 mm, while dry grits (28.4%) were between 0.09 and 0.25 mm. Higher moisture content of wet grits generally resulted in higher bulk density, static and dynamic angle of repose, but lower particle density and porosity than dry grits. Plywood typically led to the highest coefficient of static friction of both, wet and dry grits. The transported mass and air velocity fitted well into a sigmoidal model. Due to particle size, terminal velocity of wet and dry grits ranged from 1.07 to 4.25 m/s and from 0.88 to 2.87 m/s, respectively, whereas conveying velocity ranged from 1.23 to 6.47 m/s and from 1.02 to 3.70 m/s. Practical Applications Physical characteristics of wet and dry cassava grits were compared and studied. Particle size distribution relies on moisture change before and after drying. Effect of particle size on the aerodynamic properties was investigated. Homogeneity of particle size before flash drying should be controlled using sieves.