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Abstract
An experimental study on freeze-drying of skim milk in a cylindrical container was conducted to provide fundamental data essential for numerical studies on the process. Temperature histories at different positions were carefully measured during each experimental run and the measured temperature histories were combined to produce instantaneous temperature fields inside the container. In addition, mass reduction history by sublimation of ice was also measured with the same drying conditions. The obtained temperature fields clearly indicated multi-dimensional drying characteristics of the freeze-drying in the cylindrical container. Along with the experiments, the process was simulated with an analysis program developed for this study, based on a finite volume method with a moving grid system. The numerical and experimental results were in good agreement.
Acknowledgment
This study was supported by the Brain Korea 21 Project in 2001.