Particle size of spray-dried soymilk
1997
Perez-Monoz, F. | Flores, R.A.
Soymilk was spray-dried under various combinations of inlet-heated air temperature (255, 265, and 275 degrees C), atomizer speed (19,300 and 26,800 rpm), and feed rate (0.37 and 0.58 L/m) and sieved using ultrasonic and shaker/tapping methods to determine mean particle size diameter. High fat content of the soymilk required the addition of dispersion agents to increase flowability. Nine algorithms were used to calculate mean diameter from experimental data. These values were compared with Sauter and volume mean diameter estimates obtained from six empirical relations reported in the literature for spray dried products. Estimates from experimental data were found to depend on the processing temperature, sieving method and dispersion agent used, and did not agree with literature reporting decreases in particle size with increases in atomizer speed. Good estimates of Sauter and volume mean diameters were obtained from the Friedman's correlation and the modified Herring and Marshall correlation, respectively.
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