Soymilk was spray-dried under various combinations of inlet-heated air temperature (255, 265, and 275C),atomizer speed (19,300 and 26,800 rpm), and feed rate (0.37 and 0.58 L/m) and sieved using ultrasonic andshaker/tapping methods to determine mean particle size diameter. High fat content of the soymilk required the addition ofdispersion 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 relationsreported in the literature for spray dried products. Estimates from experimental data were found to depend on theprocessing temperature, sieving method and dispersion agent used, and did not agree with literature reporting decreasesin particle size with increases in atomizer speed. Good estimates of Sauter and volume mean diameters were obtainedfrom the Friedmans correlation and the modified Herring and Marshall correlation, respectively.
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Perez-Munoz et al. (1997) studied this question.