Combined far-infrared radiation (FIR) and vacuum drying has recently received more attention since the
technique has proved effective in drying some types of fruits with the aim to produce fat-free fruit based
snacks. However, most studies are of experimental nature. In this study a mathematical model, which
allows prediction of the changes of moisture content and temperature of a model food material (banana)
undergoing combined FIR and vacuum drying was developed. The predicted results were compared with
the experimental results at the absolute pressures of the drying chamber of 5, 10, and 15 kPa and at the
controlled banana center temperatures of banana of 50 _C, 55 _C, and 60 _C. Based on the comparison
between the predicted results and the experimental results, it was found that the developed model performed
adequately in predicting the changes of the moisture content. The simulated temperature at the
center of a banana slice was higher than the experimental temperature during the first 50 min of drying
but agreed well with each other afterwards.
Combined far-infrared radiation (FIR) and vacuum drying has recently received more attention since thetechnique has proved effective in drying some types of fruits with the aim to produce fat-free fruit basedsnacks. However, most studies are of experimental nature. In this study a mathematical model, whichallows prediction of the changes of moisture content and temperature of a model food material (banana)undergoing combined FIR and vacuum drying was developed. The predicted results were compared withthe experimental results at the absolute pressures of the drying chamber of 5, 10, and 15 kPa and at thecontrolled banana center temperatures of banana of 50 _C, 55 _C, and 60 _C. Based on the comparisonbetween the predicted results and the experimental results, it was found that the developed model performedadequately in predicting the changes of the moisture content. The simulated temperature at thecenter of a banana slice was higher than the experimental temperature during the first 50 min of dryingbut agreed well with each other afterwards.
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